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  • MVC Portable Area Modules *Without* MasterPages

    - by Steve Michelotti
    Portable Areas from MvcContrib provide a great way to build modular and composite applications on top of MVC. In short, portable areas provide a way to distribute MVC binary components as simple .NET assemblies where the aspx/ascx files are actually compiled into the assembly as embedded resources. I’ve blogged about Portable Areas in the past including this post here which talks about embedding resources and you can read more of an intro to Portable Areas here. As great as Portable Areas are, the question that seems to come up the most is: what about MasterPages? MasterPages seems to be the one thing that doesn’t work elegantly with portable areas because you specify the MasterPage in the @Page directive and it won’t use the same mechanism of the view engine so you can’t just embed them as resources. This means that you end up referencing a MasterPage that exists in the host application but not in your portable area. If you name the ContentPlaceHolderId’s correctly, it will work – but it all seems a little fragile. Ultimately, what I want is to be able to build a portable area as a module which has no knowledge of the host application. I want to be able to invoke the module by a full route on the user’s browser and it gets invoked and “automatically appears” inside the application’s visual chrome just like a MasterPage. So how could we accomplish this with portable areas? With this question in mind, I looked around at what other people are doing to address similar problems. Specifically, I immediately looked at how the Orchard team is handling this and I found it very compelling. Basically Orchard has its own custom layout/theme framework (utilizing a custom view engine) that allows you to build your module without any regard to the host. You simply decorate your controller with the [Themed] attribute and it will render with the outer chrome around it: 1: [Themed] 2: public class HomeController : Controller Here is the slide from the Orchard talk at this year MIX conference which shows how it conceptually works:   It’s pretty cool stuff.  So I figure, it must not be too difficult to incorporate this into the portable areas view engine as an optional piece of functionality. In fact, I’ll even simplify it a little – rather than have 1) Document.aspx, 2) Layout.ascx, and 3) <view>.ascx (as shown in the picture above); I’ll just have the outer page be “Chrome.aspx” and then the specific view in question. The Chrome.aspx not only takes the place of the MasterPage, but now since we’re no longer constrained by the MasterPage infrastructure, we have the choice of the Chrome.aspx living in the host or inside the portable areas as another embedded resource! Disclaimer: credit where credit is due – much of the code from this post is me re-purposing the Orchard code to suit my needs. To avoid confusion with Orchard, I’m going to refer to my implementation (which will be based on theirs) as a Chrome rather than a Theme. The first step I’ll take is to create a ChromedAttribute which adds a flag to the current HttpContext to indicate that the controller designated Chromed like this: 1: [Chromed] 2: public class HomeController : Controller The attribute itself is an MVC ActionFilter attribute: 1: public class ChromedAttribute : ActionFilterAttribute 2: { 3: public override void OnActionExecuting(ActionExecutingContext filterContext) 4: { 5: var chromedAttribute = GetChromedAttribute(filterContext.ActionDescriptor); 6: if (chromedAttribute != null) 7: { 8: filterContext.HttpContext.Items[typeof(ChromedAttribute)] = null; 9: } 10: } 11:   12: public static bool IsApplied(RequestContext context) 13: { 14: return context.HttpContext.Items.Contains(typeof(ChromedAttribute)); 15: } 16:   17: private static ChromedAttribute GetChromedAttribute(ActionDescriptor descriptor) 18: { 19: return descriptor.GetCustomAttributes(typeof(ChromedAttribute), true) 20: .Concat(descriptor.ControllerDescriptor.GetCustomAttributes(typeof(ChromedAttribute), true)) 21: .OfType<ChromedAttribute>() 22: .FirstOrDefault(); 23: } 24: } With that in place, we only have to override the FindView() method of the custom view engine with these 6 lines of code: 1: public override ViewEngineResult FindView(ControllerContext controllerContext, string viewName, string masterName, bool useCache) 2: { 3: if (ChromedAttribute.IsApplied(controllerContext.RequestContext)) 4: { 5: var bodyView = ViewEngines.Engines.FindPartialView(controllerContext, viewName); 6: var documentView = ViewEngines.Engines.FindPartialView(controllerContext, "Chrome"); 7: var chromeView = new ChromeView(bodyView, documentView); 8: return new ViewEngineResult(chromeView, this); 9: } 10:   11: // Just execute normally without applying Chromed View Engine 12: return base.FindView(controllerContext, viewName, masterName, useCache); 13: } If the view engine finds the [Chromed] attribute, it will invoke it’s own process – otherwise, it’ll just defer to the normal web forms view engine (with masterpages). The ChromeView’s primary job is to independently set the BodyContent on the view context so that it can be rendered at the appropriate place: 1: public class ChromeView : IView 2: { 3: private ViewEngineResult bodyView; 4: private ViewEngineResult documentView; 5:   6: public ChromeView(ViewEngineResult bodyView, ViewEngineResult documentView) 7: { 8: this.bodyView = bodyView; 9: this.documentView = documentView; 10: } 11:   12: public void Render(ViewContext viewContext, System.IO.TextWriter writer) 13: { 14: ChromeViewContext chromeViewContext = ChromeViewContext.From(viewContext); 15:   16: // First render the Body view to the BodyContent 17: using (var bodyViewWriter = new StringWriter()) 18: { 19: var bodyViewContext = new ViewContext(viewContext, bodyView.View, viewContext.ViewData, viewContext.TempData, bodyViewWriter); 20: this.bodyView.View.Render(bodyViewContext, bodyViewWriter); 21: chromeViewContext.BodyContent = bodyViewWriter.ToString(); 22: } 23: // Now render the Document view 24: this.documentView.View.Render(viewContext, writer); 25: } 26: } The ChromeViewContext (code excluded here) mainly just has a string property for the “BodyContent” – but it also makes sure to put itself in the HttpContext so it’s available. Finally, we created a little extension method so the module’s view can be rendered in the appropriate place: 1: public static void RenderBody(this HtmlHelper htmlHelper) 2: { 3: ChromeViewContext chromeViewContext = ChromeViewContext.From(htmlHelper.ViewContext); 4: htmlHelper.ViewContext.Writer.Write(chromeViewContext.BodyContent); 5: } At this point, the other thing left is to decide how we want to implement the Chrome.aspx page. One approach is the copy/paste the HTML from the typical Site.Master and change the main content placeholder to use the HTML helper above – this way, there are no MasterPages anywhere. Alternatively, we could even have Chrome.aspx utilize the MasterPage if we wanted (e.g., in the case where some pages are Chromed and some pages want to use traditional MasterPage): 1: <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %> 2: <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> 3: <% Html.RenderBody(); %> 4: </asp:Content> At this point, it’s all academic. I can create a controller like this: 1: [Chromed] 2: public class WidgetController : Controller 3: { 4: public ActionResult Index() 5: { 6: return View(); 7: } 8: } Then I’ll just create Index.ascx (a partial view) and put in the text “Inside my widget”. Now when I run the app, I can request the full route (notice the controller name of “widget” in the address bar below) and the HTML from my Index.ascx will just appear where it is supposed to.   This means no more warnings for missing MasterPages and no more need for your module to have knowledge of the host’s MasterPage placeholders. You have the option of using the Chrome.aspx in the host or providing your own while embedding it as an embedded resource itself. I’m curious to know what people think of this approach. The code above was done with my own local copy of MvcContrib so it’s not currently something you can download. At this point, these are just my initial thoughts – just incorporating some ideas for Orchard into non-Orchard apps to enable building modular/composite apps more easily. Additionally, on the flip side, I still believe that Portable Areas have potential as the module packaging story for Orchard itself.   What do you think?

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  • PostSharp, Obfuscation, and IL

    - by Simon Cooper
    Aspect-oriented programming (AOP) is a relatively new programming paradigm. Originating at Xerox PARC in 1994, the paradigm was first made available for general-purpose development as an extension to Java in 2001. From there, it has quickly been adapted for use in all the common languages used today. In the .NET world, one of the primary AOP toolkits is PostSharp. Attributes and AOP Normally, attributes in .NET are entirely a metadata construct. Apart from a few special attributes in the .NET framework, they have no effect whatsoever on how a class or method executes within the CLR. Only by using reflection at runtime can you access any attributes declared on a type or type member. PostSharp changes this. By declaring a custom attribute that derives from PostSharp.Aspects.Aspect, applying it to types and type members, and running the resulting assembly through the PostSharp postprocessor, you can essentially declare 'clever' attributes that change the behaviour of whatever the aspect has been applied to at runtime. A simple example of this is logging. By declaring a TraceAttribute that derives from OnMethodBoundaryAspect, you can automatically log when a method has been executed: public class TraceAttribute : PostSharp.Aspects.OnMethodBoundaryAspect { public override void OnEntry(MethodExecutionArgs args) { MethodBase method = args.Method; System.Diagnostics.Trace.WriteLine( String.Format( "Entering {0}.{1}.", method.DeclaringType.FullName, method.Name)); } public override void OnExit(MethodExecutionArgs args) { MethodBase method = args.Method; System.Diagnostics.Trace.WriteLine( String.Format( "Leaving {0}.{1}.", method.DeclaringType.FullName, method.Name)); } } [Trace] public void MethodToLog() { ... } Now, whenever MethodToLog is executed, the aspect will automatically log entry and exit, without having to add the logging code to MethodToLog itself. PostSharp Performance Now this does introduce a performance overhead - as you can see, the aspect allows access to the MethodBase of the method the aspect has been applied to. If you were limited to C#, you would be forced to retrieve each MethodBase instance using Type.GetMethod(), matching on the method name and signature. This is slow. Fortunately, PostSharp is not limited to C#. It can use any instruction available in IL. And in IL, you can do some very neat things. Ldtoken C# allows you to get the Type object corresponding to a specific type name using the typeof operator: Type t = typeof(Random); The C# compiler compiles this operator to the following IL: ldtoken [mscorlib]System.Random call class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle( valuetype [mscorlib]System.RuntimeTypeHandle) The ldtoken instruction obtains a special handle to a type called a RuntimeTypeHandle, and from that, the Type object can be obtained using GetTypeFromHandle. These are both relatively fast operations - no string lookup is required, only direct assembly and CLR constructs are used. However, a little-known feature is that ldtoken is not just limited to types; it can also get information on methods and fields, encapsulated in a RuntimeMethodHandle or RuntimeFieldHandle: // get a MethodBase for String.EndsWith(string) ldtoken method instance bool [mscorlib]System.String::EndsWith(string) call class [mscorlib]System.Reflection.MethodBase [mscorlib]System.Reflection.MethodBase::GetMethodFromHandle( valuetype [mscorlib]System.RuntimeMethodHandle) // get a FieldInfo for the String.Empty field ldtoken field string [mscorlib]System.String::Empty call class [mscorlib]System.Reflection.FieldInfo [mscorlib]System.Reflection.FieldInfo::GetFieldFromHandle( valuetype [mscorlib]System.RuntimeFieldHandle) These usages of ldtoken aren't usable from C# or VB, and aren't likely to be added anytime soon (Eric Lippert's done a blog post on the possibility of adding infoof, methodof or fieldof operators to C#). However, PostSharp deals directly with IL, and so can use ldtoken to get MethodBase objects quickly and cheaply, without having to resort to string lookups. The kicker However, there are problems. Because ldtoken for methods or fields isn't accessible from C# or VB, it hasn't been as well-tested as ldtoken for types. This has resulted in various obscure bugs in most versions of the CLR when dealing with ldtoken and methods, and specifically, generic methods and methods of generic types. This means that PostSharp was behaving incorrectly, or just plain crashing, when aspects were applied to methods that were generic in some way. So, PostSharp has to work around this. Without using the metadata tokens directly, the only way to get the MethodBase of generic methods is to use reflection: Type.GetMethod(), passing in the method name as a string along with information on the signature. Now, this works fine. It's slower than using ldtoken directly, but it works, and this only has to be done for generic methods. Unfortunately, this poses problems when the assembly is obfuscated. PostSharp and Obfuscation When using ldtoken, obfuscators don't affect how PostSharp operates. Because the ldtoken instruction directly references the type, method or field within the assembly, it is unaffected if the name of the object is changed by an obfuscator. However, the indirect loading used for generic methods was breaking, because that uses the name of the method when the assembly is put through the PostSharp postprocessor to lookup the MethodBase at runtime. If the name then changes, PostSharp can't find it anymore, and the assembly breaks. So, PostSharp needs to know about any changes an obfuscator does to an assembly. The way PostSharp does this is by adding another layer of indirection. When PostSharp obfuscation support is enabled, it includes an extra 'name table' resource in the assembly, consisting of a series of method & type names. When PostSharp needs to lookup a method using reflection, instead of encoding the method name directly, it looks up the method name at a fixed offset inside that name table: MethodBase genericMethod = typeof(ContainingClass).GetMethod(GetNameAtIndex(22)); PostSharp.NameTable resource: ... 20: get_Prop1 21: set_Prop1 22: DoFoo 23: GetWibble When the assembly is later processed by an obfuscator, the obfuscator can replace all the method and type names within the name table with their new name. That way, the reflection lookups performed by PostSharp will now use the new names, and everything will work as expected: MethodBase genericMethod = typeof(#kGy).GetMethod(GetNameAtIndex(22)); PostSharp.NameTable resource: ... 20: #kkA 21: #zAb 22: #EF5a 23: #2tg As you can see, this requires direct support by an obfuscator in order to perform these rewrites. Dotfuscator supports it, and now, starting with SmartAssembly 6.6.4, SmartAssembly does too. So, a relatively simple solution to a tricky problem, with some CLR bugs thrown in for good measure. You don't see those every day!

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  • PostSharp, Obfuscation, and IL

    - by simonc
    Aspect-oriented programming (AOP) is a relatively new programming paradigm. Originating at Xerox PARC in 1994, the paradigm was first made available for general-purpose development as an extension to Java in 2001. From there, it has quickly been adapted for use in all the common languages used today. In the .NET world, one of the primary AOP toolkits is PostSharp. Attributes and AOP Normally, attributes in .NET are entirely a metadata construct. Apart from a few special attributes in the .NET framework, they have no effect whatsoever on how a class or method executes within the CLR. Only by using reflection at runtime can you access any attributes declared on a type or type member. PostSharp changes this. By declaring a custom attribute that derives from PostSharp.Aspects.Aspect, applying it to types and type members, and running the resulting assembly through the PostSharp postprocessor, you can essentially declare 'clever' attributes that change the behaviour of whatever the aspect has been applied to at runtime. A simple example of this is logging. By declaring a TraceAttribute that derives from OnMethodBoundaryAspect, you can automatically log when a method has been executed: public class TraceAttribute : PostSharp.Aspects.OnMethodBoundaryAspect { public override void OnEntry(MethodExecutionArgs args) { MethodBase method = args.Method; System.Diagnostics.Trace.WriteLine( String.Format( "Entering {0}.{1}.", method.DeclaringType.FullName, method.Name)); } public override void OnExit(MethodExecutionArgs args) { MethodBase method = args.Method; System.Diagnostics.Trace.WriteLine( String.Format( "Leaving {0}.{1}.", method.DeclaringType.FullName, method.Name)); } } [Trace] public void MethodToLog() { ... } Now, whenever MethodToLog is executed, the aspect will automatically log entry and exit, without having to add the logging code to MethodToLog itself. PostSharp Performance Now this does introduce a performance overhead - as you can see, the aspect allows access to the MethodBase of the method the aspect has been applied to. If you were limited to C#, you would be forced to retrieve each MethodBase instance using Type.GetMethod(), matching on the method name and signature. This is slow. Fortunately, PostSharp is not limited to C#. It can use any instruction available in IL. And in IL, you can do some very neat things. Ldtoken C# allows you to get the Type object corresponding to a specific type name using the typeof operator: Type t = typeof(Random); The C# compiler compiles this operator to the following IL: ldtoken [mscorlib]System.Random call class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle( valuetype [mscorlib]System.RuntimeTypeHandle) The ldtoken instruction obtains a special handle to a type called a RuntimeTypeHandle, and from that, the Type object can be obtained using GetTypeFromHandle. These are both relatively fast operations - no string lookup is required, only direct assembly and CLR constructs are used. However, a little-known feature is that ldtoken is not just limited to types; it can also get information on methods and fields, encapsulated in a RuntimeMethodHandle or RuntimeFieldHandle: // get a MethodBase for String.EndsWith(string) ldtoken method instance bool [mscorlib]System.String::EndsWith(string) call class [mscorlib]System.Reflection.MethodBase [mscorlib]System.Reflection.MethodBase::GetMethodFromHandle( valuetype [mscorlib]System.RuntimeMethodHandle) // get a FieldInfo for the String.Empty field ldtoken field string [mscorlib]System.String::Empty call class [mscorlib]System.Reflection.FieldInfo [mscorlib]System.Reflection.FieldInfo::GetFieldFromHandle( valuetype [mscorlib]System.RuntimeFieldHandle) These usages of ldtoken aren't usable from C# or VB, and aren't likely to be added anytime soon (Eric Lippert's done a blog post on the possibility of adding infoof, methodof or fieldof operators to C#). However, PostSharp deals directly with IL, and so can use ldtoken to get MethodBase objects quickly and cheaply, without having to resort to string lookups. The kicker However, there are problems. Because ldtoken for methods or fields isn't accessible from C# or VB, it hasn't been as well-tested as ldtoken for types. This has resulted in various obscure bugs in most versions of the CLR when dealing with ldtoken and methods, and specifically, generic methods and methods of generic types. This means that PostSharp was behaving incorrectly, or just plain crashing, when aspects were applied to methods that were generic in some way. So, PostSharp has to work around this. Without using the metadata tokens directly, the only way to get the MethodBase of generic methods is to use reflection: Type.GetMethod(), passing in the method name as a string along with information on the signature. Now, this works fine. It's slower than using ldtoken directly, but it works, and this only has to be done for generic methods. Unfortunately, this poses problems when the assembly is obfuscated. PostSharp and Obfuscation When using ldtoken, obfuscators don't affect how PostSharp operates. Because the ldtoken instruction directly references the type, method or field within the assembly, it is unaffected if the name of the object is changed by an obfuscator. However, the indirect loading used for generic methods was breaking, because that uses the name of the method when the assembly is put through the PostSharp postprocessor to lookup the MethodBase at runtime. If the name then changes, PostSharp can't find it anymore, and the assembly breaks. So, PostSharp needs to know about any changes an obfuscator does to an assembly. The way PostSharp does this is by adding another layer of indirection. When PostSharp obfuscation support is enabled, it includes an extra 'name table' resource in the assembly, consisting of a series of method & type names. When PostSharp needs to lookup a method using reflection, instead of encoding the method name directly, it looks up the method name at a fixed offset inside that name table: MethodBase genericMethod = typeof(ContainingClass).GetMethod(GetNameAtIndex(22)); PostSharp.NameTable resource: ... 20: get_Prop1 21: set_Prop1 22: DoFoo 23: GetWibble When the assembly is later processed by an obfuscator, the obfuscator can replace all the method and type names within the name table with their new name. That way, the reflection lookups performed by PostSharp will now use the new names, and everything will work as expected: MethodBase genericMethod = typeof(#kGy).GetMethod(GetNameAtIndex(22)); PostSharp.NameTable resource: ... 20: #kkA 21: #zAb 22: #EF5a 23: #2tg As you can see, this requires direct support by an obfuscator in order to perform these rewrites. Dotfuscator supports it, and now, starting with SmartAssembly 6.6.4, SmartAssembly does too. So, a relatively simple solution to a tricky problem, with some CLR bugs thrown in for good measure. You don't see those every day! Cross posted from Simple Talk.

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  • Building on someone else's DefaultButton Silverlight work...

    - by KyleBurns
    This week I was handed a "simple" requirement - have a search screen execute its search when the user pressed the Enter key instead of having to move hands from keyboard to mouse and click Search.  That is a reasonable request that has been met for years both in Windows and Web apps.  I did a quick scan for code to pilfer and found Patrick Cauldwell's Blog posting "A 'Default Button' In Silverlight".  This posting was a great start and I'm glad that the basic work had been done for me, but I ran into one issue - when using bound textboxes (I'm a die-hard MVVM enthusiast when it comes to Silverlight development), the search was being executed before the textbox I was in when the Enter key was pressed updated its bindings.  With a little bit of reflection work, I think I have found a good generic solution that builds upon Patrick's to make it more binding-friendly.  Also, I wanted to set the DefaultButton at a higher level than on each TextBox (or other control for that matter), so the use of mine is intended to be set somewhere such as the LayoutRoot or other high level control and will apply to all controls beneath it in the control tree.  I haven't tested this on controls that treat the Enter key special themselves in the mix. The real change from Patrick's solution here is that in the KeyUp event, I grab the source of the KeyUp event (in my case the textbox containing search criteria) and loop through the static fields on the element's type looking for DependencyProperty instances.  When I find a DependencyProperty, I grab the value and query for bindings.  Each time I find a binding, UpdateSource is called to make sure anything bound to any property of the field has the opportunity to update before the action represented by the DefaultButton is executed. Here's the code: public class DefaultButtonService { public static DependencyProperty DefaultButtonProperty = DependencyProperty.RegisterAttached("DefaultButton", typeof (Button), typeof (DefaultButtonService), new PropertyMetadata (null, DefaultButtonChanged)); private static void DefaultButtonChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { var uiElement = d as UIElement; var button = e.NewValue as Button; if (uiElement != null && button != null) { uiElement.KeyUp += (sender, arg) => { if (arg.Key == Key.Enter) { var element = arg.OriginalSource as FrameworkElement; if (element != null) { UpdateBindings(element); } if (button.IsEnabled) { button.Focus(); var peer = new ButtonAutomationPeer(button); var invokeProv = peer.GetPattern(PatternInterface.Invoke) as IInvokeProvider; if (invokeProv != null) invokeProv.Invoke(); arg.Handled = true; } } }; } } public static DefaultButtonService GetDefaultButton(UIElement obj) { return (DefaultButtonService) obj.GetValue(DefaultButtonProperty); } public static void SetDefaultButton(DependencyObject obj, DefaultButtonService button) { obj.SetValue(DefaultButtonProperty, button); } public static void UpdateBindings(FrameworkElement element) { element.GetType().GetFields(BindingFlags.Public | BindingFlags.Static).ForEach(field => { if (field.FieldType.IsAssignableFrom(typeof(DependencyProperty))) { try { var dp = field.GetValue(null) as DependencyProperty; if (dp != null) { var binding = element.GetBindingExpression(dp); if (binding != null) { binding.UpdateSource(); } } } // ReSharper disable EmptyGeneralCatchClause catch (Exception) // ReSharper restore EmptyGeneralCatchClause { // swallow exceptions } } }); } }

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  • Why is XmlSerializer throwing an InvalidOperationException?

    - by qster
    public void Save() { XmlSerializer Serializer = new XmlSerializer(typeof(DatabaseInformation)); /* A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll A first chance exception of type 'System.InvalidOperationException' occurred in System.Xml.dll */ // .... } This is the whole class if you need it: public class DatabaseInformation { /* Create new database */ public DatabaseInformation(string name) { mName = name; NeedsSaving = true; mFieldsInfo = new List<DatabaseField>(); } /* Read from file */ public static DatabaseInformation DeserializeFromFile(string xml_file_path) { XmlSerializer Serializer = new XmlSerializer(typeof(DatabaseInformation)); TextReader r = new StreamReader(xml_file_path); DatabaseInformation ret = (DatabaseInformation)Serializer.Deserialize(r); r.Close(); ret.NeedsSaving = false; return ret; } /* Save */ public void Save() { XmlSerializer Serializer = new XmlSerializer(typeof(DatabaseInformation)); if (!mNeedsSaving) return; TextWriter w = new StreamWriter(Path.Combine(Program.MainView.CommonDirectory.Get(), Name + ".xml"), false); Serializer.Serialize(w, this); w.Close(); NeedsSaving = false; } private string mName; public string Name { get { return mName; } } private bool mNeedsSaving; public bool NeedsSaving { get { return mNeedsSaving; } set { mNeedsSaving = value; Program.MainView.UpdateTitle(value); } } private bool mHasId; public bool HasId { get { return mHasId; } } List<DatabaseField> mFieldsInfo; }

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  • C# WCF Server retrieves 'List<T>' with 1 entry, but client doesn't receive it?! Please help Urgentl

    - by Neville
    Hi Everyone, I've been battling and trying to research this issue for over 2 days now with absolutely no luck. I am trying to retrieve a list of clients from the server (server using fluentNHibernate). The client object is as follow: [DataContract] //[KnownType(typeof(System.Collections.Generic.List<ContactPerson>))] //[KnownType(typeof(System.Collections.Generic.List<Address>))] //[KnownType(typeof(System.Collections.Generic.List<BatchRequest>))] //[KnownType(typeof(System.Collections.Generic.List<Discount>))] [KnownType(typeof(EClientType))] [KnownType(typeof(EComType))] public class Client { #region Properties [DataMember] public virtual int ClientID { get; set; } [DataMember] public virtual EClientType ClientType { get; set; } [DataMember] public virtual string RegisterID {get; set;} [DataMember] public virtual string HerdCode { get; set; } [DataMember] public virtual string CompanyName { get; set; } [DataMember] public virtual bool InvoicePerBatch { get; set; } [DataMember] public virtual EComType ResultsComType { get; set; } [DataMember] public virtual EComType InvoiceComType { get; set; } //[DataMember] //public virtual IList<ContactPerson> Contacts { get; set; } //[DataMember] //public virtual IList<Address> Addresses { get; set; } //[DataMember] //public virtual IList<BatchRequest> Batches { get; set; } //[DataMember] //public virtual IList<Discount> Discounts { get; set; } #endregion #region Overrides public override bool Equals(object obj) { var other = obj as Client; if (other == null) return false; return other.GetHashCode() == this.GetHashCode(); } public override int GetHashCode() { return ClientID.GetHashCode() | ClientType.GetHashCode() | RegisterID.GetHashCode() | HerdCode.GetHashCode() | CompanyName.GetHashCode() | InvoicePerBatch.GetHashCode() | ResultsComType.GetHashCode() | InvoiceComType.GetHashCode();// | Contacts.GetHashCode() | //Addresses.GetHashCode() | Batches.GetHashCode() | Discounts.GetHashCode(); } #endregion } As you can see, I have allready tried to remove the sub-lists, though even with this simplified version of the client I still run into the propblem. my fluent mapping is: public class ClientMap : ClassMap<Client> { public ClientMap() { Table("Clients"); Id(p => p.ClientID); Map(p => p.ClientType).CustomType<EClientType>(); ; Map(p => p.RegisterID); Map(p => p.HerdCode); Map(p => p.CompanyName); Map(p => p.InvoicePerBatch); Map(p => p.ResultsComType).CustomType<EComType>(); Map(p => p.InvoiceComType).CustomType<EComType>(); //HasMany<ContactPerson>(p => p.Contacts) // .KeyColumns.Add("ContactPersonID") // .Inverse() // .Cascade.All(); //HasMany<Address>(p => p.Addresses) // .KeyColumns.Add("AddressID") // .Inverse() // .Cascade.All(); //HasMany<BatchRequest>(p => p.Batches) // .KeyColumns.Add("BatchID") // .Inverse() // .Cascade.All(); //HasMany<Discount>(p => p.Discounts) // .KeyColumns.Add("DiscountID") // .Inverse() // .Cascade.All(); } The client method, seen below, connects to the server. The server retrieves the list, and everything looks right in the object, still, when it returns, the client doesn't receive anything (it receive a List object, but with nothing in it. Herewith the calling method: public List<s.Client> GetClientList() { try { s.DataServiceClient svcClient = new s.DataServiceClient(); svcClient.Open(); List<s.Client> clients = new List<s.Client>(); clients = svcClient.GetClientList().ToList<s.Client>(); svcClient.Close(); //when receiving focus from server, the clients object has a count of 0 return clients; } catch (Exception e) { MessageBox.Show(e.Message); } return null; } and the server method: public IList<Client> GetClientList() { var clients = new List<Client>(); try { using (var session = SessionHelper.OpenSession()) { clients = session.Linq<Client>().Where(p => p.ClientID > 0).ToList<Client>(); } } catch (Exception e) { EventLog.WriteEntry("eCOWS.Data", e.Message); } return clients; //returns a list with 1 client in it } the server method interface is: [UseNetDataContractSerializer] [OperationContract] IList<Client> GetClientList(); for final references, here is my client app.config entries: <system.serviceModel> <bindings> <netTcpBinding> <binding name="NetTcpBinding_IDataService" listenBacklog="10" maxConnections="10" transferMode="Buffered" transactionProtocol="OleTransactions" maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" receiveTimeout="00:10:00" sendTimeout="00:10:00"> <readerQuotas maxDepth="51200000" maxStringContentLength="51200000" maxArrayLength="51200000" maxBytesPerRead="51200000" maxNameTableCharCount="51200000" /> <security mode="Transport"/> </binding> </netTcpBinding> </bindings> <client> <endpoint address="net.tcp://localhost:9000/eCOWS/DataService" binding="netTcpBinding" bindingConfiguration="NetTcpBinding_IDataService" contract="eCowsDataService.IDataService" name="NetTcpBinding_IDataService" behaviorConfiguration="eCowsEndpointBehavior"> </endpoint> <endpoint address="MEX" binding="mexHttpBinding" contract="IMetadataExchange" /> </client> <behaviors> <endpointBehaviors> <behavior name="eCowsEndpointBehavior"> <dataContractSerializer maxItemsInObjectGraph="2147483647"/> </behavior> </endpointBehaviors> </behaviors> </system.serviceModel> and my server app.config: <system.serviceModel> <bindings> <netTcpBinding> <binding name="netTcpBinding" maxConnections="10" listenBacklog="10" transferMode="Buffered" transactionProtocol="OleTransactions" maxBufferSize="2147483647" maxReceivedMessageSize="2147483647" sendTimeout="00:10:00" receiveTimeout="00:10:00"> <readerQuotas maxDepth="51200000" maxStringContentLength="51200000" maxArrayLength="51200000" maxBytesPerRead="51200000" maxNameTableCharCount="51200000" /> <security mode="Transport"/> </binding> </netTcpBinding> </bindings> <services> <service name="eCows.Data.Services.DataService" behaviorConfiguration="eCowsServiceBehavior"> <host> <baseAddresses> <add baseAddress="http://localhost:9001/eCOWS/" /> <add baseAddress="net.tcp://localhost:9000/eCOWS/" /> </baseAddresses> </host> <endpoint address="DataService" binding="netTcpBinding" contract="eCows.Data.Services.IDataService" behaviorConfiguration="eCowsEndpointBehaviour"> </endpoint> <endpoint address="MEX" binding="mexHttpBinding" contract="IMetadataExchange" /> </service> </services> <behaviors> <endpointBehaviors> <behavior name="eCowsEndpointBehaviour"> <dataContractSerializer maxItemsInObjectGraph="2147483647" /> </behavior> </endpointBehaviors> <serviceBehaviors> <behavior name="eCowsServiceBehavior"> <serviceMetadata httpGetEnabled="True"/> <serviceThrottling maxConcurrentCalls="10" maxConcurrentSessions="10"/> <serviceDebug includeExceptionDetailInFaults="False" /> </behavior> <behavior name="MexBehaviour"> <serviceMetadata /> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> I use to run into "socket closed / network or timeout" errors, and the trace showed clearly that on the callback it was looking for a listening endpoint, but couldn't find one. Anyway, after adding the UseNetSerializer that error went away, yet now I'm just not getting anything. Oh PS. if I add all the commented out List items, I still retrieve an entry from the DB, but also still not receive anything on the client. if I remove the [UseNetDataContractSerializer] I get the following error(s) in the svclog : WARNING: Description Faulted System.ServiceModel.Channels.ServerSessionPreambleConnectionReader+ServerFramingDuplexSessionChannel WARNING: Description Faulted System.ServiceModel.Channels.ServiceChannel ERROR: Initializing[eCows.Data.Models.Client#3]-failed to lazily initialize a collection of role: eCows.Data.Models.Client.Addresses, no session or session was closed ... ERROR: Could not find default endpoint element that references contract 'ILogbookManager' in the ServiceModel client configuration section. This might be because no configuration file was found for your application, or because no endpoint element matching this contract could be found in the client element. If I add a .Not.LazyLoad to the List mapping items, I'm back at not receiving errors, but also not receiving any client information.. Sigh! Please, if anyone can help with this I'd be extremely grateful. I'm probably just missing something small.. but... what is it :) hehe. Thanks in advance! Neville

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  • WCF deadlock when using callback channel

    - by mafutrct
    This is probably a simple mistake, but I could not figure out what was wrong. I basically got a method like this: [ServiceBehavior ( ConcurrencyMode = ConcurrencyMode.Reentrant, InstanceContextMode = InstanceContextMode.PerSession, IncludeExceptionDetailInFaults = true) ] public class Impl : SomeContract { public string Foo() { _CallbackChannel.Blah(); return ""; } } Its interface is decorated: [ServiceContract ( Namespace = "http://MyServiceInterface", SessionMode = SessionMode.Required, CallbackContract = typeof (WcfCallbackContract)) ] public interface SomeContract { [OperationContract] string Foo (); } The service is hosted like this: ServiceHost host = new ServiceHost (typeof (Impl)); var binding = new NetTcpBinding (); var address = new Uri ("net.tcp://localhost:8000/"); host.AddServiceEndpoint ( typeof (SomeContract), binding, address); host.Open (); The client implements the callback interface and calls Foo. Foo runs, calls the callback method and returns. However, the client is still struck in the call to Foo and never returns. The client callback method is never run. I guess I made a design mistake somewhere. If needed, I can post more code. Any help is appreciated.

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  • Extjs - Dynamically generate fields in a FormPanel

    - by Benjamin
    Hi all, I've got a script that generates a form panel: var form = new Ext.FormPanel({ id: 'form-exploit-zombie-'+zombie_ip, formId: 'form-exploit-zombie-'+zombie_ip, border: false, labelWidth: 75, formBind: true, defaultType: 'textfield', url: '/ui/modules/exploit/new', autoHeight: true, buttons:[{ text: 'Execute exploit', handler: function() { var form = Ext.getCmp('form-exploit-zombie-'+zombie_ip); form.getForm().submit({ waitMsg: 'Running exploit ...', success: function() { Ext.beef.msg('Yeh!', 'Exploit sent to the zombie.') }, failure: function() { Ext.beef.msg('Ehhh!', 'An error occured while trying to send the exploit.') } }); } }] }); that same scripts then retrieves a json file from my server which defines how many input fields that form should contain. The script then adds those fields to the form: Ext.each(inputs, function(input) { var input_name; var input_type = 'TextField'; var input_definition = new Array(); if(typeof input == 'string') { input_name = input; var field = new Ext.form.TextField({ id: 'form-zombie-'+zombie_ip+'-field-'+input_name, fieldLabel: input_name, name: 'txt_'+input_name, width: 175, allowBlank:false }); form.add(field); } else if(typeof input == 'object') { //input_name = array_key(input); for(definition in input) { if(typeof definition == 'string') { } } } else { return; } }); Finally, the form is added to the appropriate panel in my interface: panel.add(form); panel.doLayout(); The problem I have is: when I submit the form by clicking on the button, the http request sent to my server does not contain the fields added to the form. In other words, I'm not posting those fields to the server. Anyone knows why and how I could fix that? Thanks for your time.

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  • Invalid Cast Exception ASP.NET C#

    - by Shadow Scorpion
    I have a problem in this code: public static T[] GetExtras <T>(Type[] Types) { List<T> Res = new List<T>(); foreach (object Current in GetExtras(typeof(T), Types)) { Res.Add((T)Current);//this is the error } return Res.ToArray(); } public static object[] GetExtras(Type ExtraType, Type[] Types) { lock (ExtraType) { if (!ExtraType.IsInterface) return new object[] { }; List<object> Res = new List<object>(); bool found = false; found = (ExtraType == typeof(IExtra)); foreach (Type CurInterFace in ExtraType.GetInterfaces()) { if (found = (CurInterFace == typeof(IExtra))) break; } if (!found) return new object[] { }; foreach (Type CurType in Types) { found = false; if (!CurType.IsClass) continue; foreach (Type CurInterface in CurType.GetInterfaces()) { try { if (found = (CurInterface.FullName == ExtraType.FullName)) break; } catch { } } try { if (found) Res.Add(Activator.CreateInstance(CurType)); } catch { } } return Res.ToArray(); } } When I'm using this code in windows application it works! But I cant use it on ASP page. Why?

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  • flash player: usage

    - by Syom
    i use Adobe flash player in my site, and now i need to increment some filed in database, when user click on player. here is the script <div id="conteiner" style="text-align: center;" ></div> <script type="text/javascript"> var s1 = new SWFObject("player.swf","ply","420","380","9","#FFFFFF"); s1.addParam("allowfullscreen","true"); s1.addParam("allowscriptaccess","always"); s1.addParam("flashvars","file=<?=$video ?>"); s1.write("conteiner"); </script> i deside to use ajax for it, but how can i write a function in the flash object? thanks in advance UPDATE: i only have the swfobject.js file, which contains such data if(typeof deconcept=="undefined"){var deconcept=new Object();} if(typeof deconcept.util=="undefined"){deconcept.util=new Object();} if(typeof deconcept.SWFObjectUtil=="undefined"){deconcept.SWFObjectUtil=new Object();}deconcept.SWFObject=function(_1,id,w,h,_5,c,_7,_8,_9,_a){if(!document.getElementById){return;}this.DETECT_KEY=_a?_a:"detectflash";this.skipDetect=deconcept.util.getRequestParameter(this.DETECT_KEY);this.params=new Object();this.variables=new Object();this.attributes=new Array();if(_1){this.setAttribute("swf",_1);}if(id){this.setAttribute("id",id);}if(w){this.setAttribute("width",w);}if(h){this.setAttribute("height",h);}if(_5){this.setAttribute("version",new deconcept.PlayerVersion(_5.toString().split(".")));}this.installedVer=deconcept.SWFObjectUtil.getPlayerVersion();if(!window.opera&&document.all&&this.installedVer.major>7) ... and the player.swf, and the html, i've shown allready. i don't now is this flash player or no, and what can i do?

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  • Silverlight TemplateBinding to RotateTransform

    - by Trog Dog
    I am trying to create the simplest Silverlight templated control, and I can't seem to get TemplateBinding to work on the Angle property of a RotateTransform. Here's the ControlTemplate from generic.xaml: <ControlTemplate TargetType="local:CtlKnob"> <Grid x:Name="grid" RenderTransformOrigin="0.5,0.5"> <Grid.RenderTransform> <TransformGroup> <RotateTransform Angle="{TemplateBinding Angle}"/> <!-- This does not work --> <!-- <RotateTransform Angle="70"/> --> <!-- This works --> </TransformGroup> </Grid.RenderTransform> <Ellipse Stroke="#FFB70404" StrokeThickness="19"/> <Ellipse Stroke="White" StrokeThickness="2" Height="16" VerticalAlignment="Top" HorizontalAlignment="Center" Width="16" Margin="0,2,0,0"/> </Grid> </ControlTemplate> Here's the C#: using System.Windows; using System.Windows.Controls; namespace CtlKnob { public class CtlKnob : Control { public CtlKnob() { this.DefaultStyleKey = typeof(CtlKnob); } public static readonly DependencyProperty AngleProperty = DependencyProperty.Register("Angle", typeof(double), typeof(CtlKnob), null); public double Angle { get { return (double)GetValue(AngleProperty); } set { SetValue(AngleProperty,value); } } } }

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  • Could not load ConfigurationSection class - type

    - by nCdy
    at web.config <section name="FlowWebDataProviders" type="FlowWebProvidersSection" requirePermission="false"/> <FlowWebDataProviders peopleProviderName="sqlProvider" IzmListProviderName="sqlProvider"> <PeopleProviders> <add name="sqlProvider" type="SqlPeopleProvider" connectionStringName="FlowServerConnectionString"/> <add name="xmlProvider" type="XmlPeopleProvider" schemaFile="People.xsd" dataFile="People.xml"/> </PeopleProviders> <IzmListProviders> <add name="sqlProvider" type="SqlIzmListProvider" connectionStringName="FlowServerConnectionString"/> </IzmListProviders> </FlowWebDataProviders> and public class FlowWebProvidersSection : ConfigurationSection { [ConfigurationProperty("peopleProviderName", IsRequired = true)] public PeopleProviderName : string { get { this["peopleProviderName"] :> string } set { this["peopleProviderName"] = value; } } [ConfigurationProperty("IzmListProviderName", IsRequired = true)] public IzmListProviderName : string { get { (this["IzmListProviderName"] :> string) } set { this["IzmListProviderName"] = value; } } [ConfigurationProperty("PeopleProviders")] [ConfigurationValidatorAttribute(typeof(ProviderSettingsValidation))] public PeopleProviders : ProviderSettingsCollection { get { this["PeopleProviders"] :> ProviderSettingsCollection } } [ConfigurationProperty("IzmListProviders")] [ConfigurationValidatorAttribute(typeof(ProviderSettingsValidation))] public IzmListProviders : ProviderSettingsCollection { get { this["IzmListProviders"] :> ProviderSettingsCollection } } } and public class ProviderSettingsValidation : ConfigurationValidatorBase { public override CanValidate(typex : Type) : bool { if(typex : object == typeof(ProviderSettingsCollection)) true else false } /// <summary> // validate the provider section /// </summary> public override Validate(value : object) : void { mutable providerCollection : ProviderSettingsCollection = match(value) { | x is ProviderSettingsCollection => x | _ => null } unless (providerCollection == null) { foreach (_provider is ProviderSettings in providerCollection) { when (String.IsNullOrEmpty(_provider.Type)) { throw ConfigurationErrorsException("Type was not defined in the provider"); } mutable dataAccessType : Type = Type.GetType(_provider.Type); when (dataAccessType == null) { throw (InvalidOperationException("Provider's Type could not be found")); } } } } } project : Web Application ... I need to find error first . . . why : Error message parser: Error creating configuration section handler for FlowWebDataProviders: Could not load type 'FlowWebProvidersSection'. ? by the way : syntax of nemerle (current language) is very similar C#, don't afraid to read the code... thank you

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  • Is there a better way to create a generic convert string to enum method or enum extension?

    - by Kelsey
    I have the following methods in an enum helper class (I have simplified it for the purpose of the question): static class EnumHelper { public enum EnumType1 : int { Unknown = 0, Yes = 1, No = 2 } public enum EnumType2 : int { Unknown = 0, Dog = 1, Cat = 2, Bird = 3 } public enum EnumType3 : int { Unknown = 0, iPhone = 1, Andriod = 2, WindowsPhone7 = 3, Palm = 4 } public static EnumType1 ConvertToEnumType1(string value) { return (string.IsNullOrEmpty(value)) ? EnumType1.Unknown : (EnumType1)(Enum.Parse(typeof(EnumType1), value, true)); } public static EnumType2 ConvertToEnumType2(string value) { return (string.IsNullOrEmpty(value)) ? EnumType2.Unknown : (EnumType2)(Enum.Parse(typeof(EnumType2), value, true)); } public static EnumType3 ConvertToEnumType3(string value) { return (string.IsNullOrEmpty(value)) ? EnumType3.Unknown : (EnumType3)(Enum.Parse(typeof(EnumType3), value, true)); } } So the question here is, can I trim this down to an Enum extension method or maybe some type of single method that can handle any type. I have found some examples to do so with basic enums but the difference in my example is all the enums have the Unknown item that I need returned if the string is null or empty (if no match is found I want it to fail). Looking for something like the following maybe: EnumType1 value = EnumType1.Convert("Yes"); // or EnumType1 value = EnumHelper.Convert(EnumType1, "Yes"); One function to do it all... how to handle the Unknown element is the part that I am hung up on.

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  • Converting From Castle Windsor To StructureMap In An MVC2 Project

    - by alphadogg
    I am learning about best practices in MVC2 and I am knocking off a copy of the "Who Can Help Me" project (http://whocanhelpme.codeplex.com/) off Codeplex. In it, they use Castle Windsor for their DI container. One "learning" task I am trying to do is convert this subsystem in this project to use StructureMap. Basically, at Application_Start(), the code news up a Windsor container. Then, it goes through multiple assemblies, using MEF: public static void Register(IContainer container) { var catalog = new CatalogBuilder() .ForAssembly(typeof(IComponentRegistrarMarker).Assembly) .ForMvcAssembly(Assembly.GetExecutingAssembly()) .ForMvcAssembliesInDirectory(HttpRuntime.BinDirectory, "CPOP*.dll") // Won't work in Partial trust .Build(); var compositionContainer = new CompositionContainer(catalog); compositionContainer .GetExports<IComponentRegistrar>() .Each(e => e.Value.Register(container)); } and any class in any assembly that has an IComponentRegistrar interface will get its Register() method run. For example, the controller registrar's Register() method implementation basically is: public void Register(IContainer container) { Assembly.GetAssembly(typeof(ControllersRegistrarMarker)).GetExportedTypes() .Where(IsController) .Each(type => container.AddComponentLifeStyle( type.Name.ToLower(), type, LifestyleType.Transient )); } private static bool IsController(Type type) { return typeof(IController).IsAssignableFrom(type); } Hopefully, I am not butchering WCHM too much. I am wondering how does one do this with StructureMap?

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  • LINQ Query to DataTable.DataSource

    - by lumberjack
    I am trying to perform a LINQ query on a DataTable and show the result in another DataTable. My source DataTable looks something like this: DataTable myDataTable = new DataTable(); myDataTable.Columns.Add("OrderID", typeof(int)); myDataTable.Columns.Add("Date", typeof(DateTime)); myDataTable.Columns.Add("UnitsPurchased", typeof(int)); The resulting DataTable looks like this when filled: Order ID Date Units Purchased 16548 10/15/09 250 17984 11/03/09 512 20349 01/11/10 213 34872 01/15/10 175 My current LINQ query looks like this: IEnumerable<DataRow> query = (from row in myDataTable.AsEnumerable() where row.UnitsPurchased > 200 select new { row.OrderID, row.Date, row.UnitsPurchased }) as IEnumerable<DataRow>; resultDataTable.DataSource = query.CopyToDataTable<DataRow>(); Every time I run this code query is null. I can see that that the as IEnumerable<DataRow> is the culprit, but it makes no since to me since DataTable.AsEnumerable() returns an IEnumerable<DataRow>. Any help would be appreciated.

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  • How to assign Image Uri in a custom Control.

    - by Subhen
    Hi, I want to place an image inside my custom control , so my generic.xaml looks like below: <Style TargetType="local:generic"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="local:generic"> <Grid Background="{TemplateBinding Background}"> <Rectangle> <Rectangle.Fill> <SolidColorBrush x:Name="BackgroundBrush" Opacity="0" /> </Rectangle.Fill> </Rectangle> <TextBlock Text="{TemplateBinding Text}" HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="{TemplateBinding Foreground}"/> <Image Source="{TemplateBinding Source}" HorizontalAlignment="Center" VerticalAlignment="Center"/> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> My Codebehind is as follows: public class Generic : Control { public static DependencyProperty ImageUri = DependencyProperty.Register("Source", typeof(Uri), typeof(generic), new PropertyMetadata("")); public Uri Source { get { return (Uri)GetValue(generic.ImageUri); } set { SetValue(generic.ImageUri, value); } } public generic() { this.DefaultStyleKey = typeof(generic); } } Apllication is compiling fine but while I am trying to run it throws the following exception : $exception {System.Windows.Markup.XamlParseException: System.TypeInitializationException: The type initializer for 'testCstmCntrl.themes.generic' threw an exception. ---> System.ArgumentException: Default value type does not match type of property. Thanks, Subhen

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  • Generate exe in .Net

    - by rwallace
    In .Net, you can generate byte code in memory, and presumably save the resulting program to a .exe file. To do the first step, I have the following test code adapted from http://www.code-magazine.com/Article.aspx?quickid=0301051 var name = new AssemblyName(); name.Name = "MyAssembly"; var ad = Thread.GetDomain(); var ab = ad.DefineDynamicAssembly(name, AssemblyBuilderAccess.Run); var mb = ab.DefineDynamicModule("MyModule"); var theClass = mb.DefineType("MathOps", TypeAttributes.Public); var retType = typeof(System.Int32); var parms = new Type[2]; parms[0] = typeof(System.Int32); parms[1] = typeof(System.Int32); var meb = theClass.DefineMethod("ReturnSum", MethodAttributes.Public, retType, parms); var gen = meb.GetILGenerator(); gen.Emit(OpCodes.Ldarg_1); gen.Emit(OpCodes.Ldarg_2); gen.Emit(OpCodes.Add_Ovf); gen.Emit(OpCodes.Stloc_0); gen.Emit(OpCodes.Br_S); gen.Emit(OpCodes.Ldloc_0); gen.Emit(OpCodes.Ret); theClass.CreateType(); How do you do the second step, and save the result to a .exe?

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  • How can I handle events within my custom control?

    - by highone
    I am not looking to create new events. I need to create a canvas control that optionally fades in or out depending on whether or not the mouse is over it. The code below probably explains what I want to do better than I can. private Storyboard fadeInStoryboard; private Storyboard fadeOutStoryboard; public FadingOptionPanel() { InitializeComponent(); } public static readonly DependencyProperty FadeEnabledProperty = DependencyProperty.Register("IsFadeEnabled", typeof(bool), typeof(FadingOptionPanel), new FrameworkPropertyMetadata(true, OnFadeEnabledPropertyChanged, OnCoerceFadeEnabledProperty)); public bool IsFadeEnabled { get { return (bool)GetValue(FadeEnabledProperty); } set { SetValue(FadeEnabledProperty, value); } } private static void OnFadeEnabledPropertyChanged(DependencyObject source, DependencyPropertyChangedEventArgs e) { } private static object OnCoerceFadeEnabledProperty(DependencyObject sender, object data) { if (data.GetType() != typeof(bool)) { data = true; } return data; } private void FadingOptionPanel_MouseEnter(object sender, MouseEventArgs e) { if (IsFadeEnabled) { fadeInStoryboard.Begin(this); } } private void FadingOptionPanel_MouseLeave(object sender, MouseEventArgs e) { if (IsFadeEnabled) { fadeOutStoryboard.Begin(this); } } private void FadingOptionsPanel_Loaded(object sender, RoutedEventArgs e) { //Initialize Fade In Animation DoubleAnimation fadeInDoubleAnimation = new DoubleAnimation(); fadeInDoubleAnimation.From = 0; fadeInDoubleAnimation.To = 1; fadeInDoubleAnimation.Duration = new Duration(TimeSpan.FromSeconds(.5)); fadeInStoryboard = new Storyboard(); fadeInStoryboard.Children.Add(fadeInDoubleAnimation); Storyboard.SetTargetName(fadeInDoubleAnimation, this.Name); Storyboard.SetTargetProperty(fadeInDoubleAnimation, new PropertyPath(Canvas.OpacityProperty)); //Initialize Fade Out Animation DoubleAnimation fadeOutDoubleAnimation = new DoubleAnimation(); fadeOutDoubleAnimation.From = 1; fadeOutDoubleAnimation.To = 0; fadeOutDoubleAnimation.Duration = new Duration(TimeSpan.FromSeconds(.2)); fadeOutStoryboard = new Storyboard(); fadeOutStoryboard.Children.Add(fadeOutDoubleAnimation); Storyboard.SetTargetName(fadeOutDoubleAnimation, this.Name); Storyboard.SetTargetProperty(fadeOutDoubleAnimation, new PropertyPath(Canvas.OpacityProperty)); } I originally was using this code inside a usercontrol instead of a custom control before I found out that usercontrols don't support content.

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  • How to use CodeDomSerializer to serialize an object in .Net?

    - by user341127
    I have a class, which is defined as the following: [ToolboxItem(false)] [DesignTimeVisible(false)] [DesignerSerializer("DevExpress.XtraEditors.Design.RepositoryItemCodeDomSerializer, DevExpress.XtraEditors.v10.1.Design", "System.ComponentModel.Design.Serialization.CodeDomSerializer, System.Design")] [Designer("DevExpress.XtraEditors.Design.BaseRepositoryItemDesigner, DevExpress.XtraEditors.v10.1.Design")] [LicenseProvider(typeof(DXEditorLicenseProvider))] public class RepositoryItem : Component, ISupportInitialize, ICustomTypeDescriptor, IImageCollectionHelper {......} I tried the following code to serialize the object of this class. DesignerSerializationManager m = new System.ComponentModel.Design.Serialization.DesignerSerializationManager(); m.CreateSession(); DevExpress.XtraEditors.Design.RepositoryItemCodeDomSerializer s = m.GetSerializer(typeof(RepositoryItem), typeof(DevExpress.XtraEditors.Design.RepositoryItemCodeDomSerializer)) as DevExpress.XtraEditors.Design.RepositoryItemCodeDomSerializer; RepositoryItem i = persistentRepository1.Items[0]; //m.Container.Add(i); s.Serialize(m,i );// An error "Object reference not set to an instance of an object." happended here. For I am not familiar with CodeDom, I have spent one day to get the way out. I guess the above code has some stupid mistakes. Please give me a hand to show how to serialize AND DeSelialize such objects of the class of Repository. BTW, the reason I don't use any other serializer is that I am supposed not to have rights to know the source code of RepositoryItem and others could inherit RepositoryItem at the same time. And actually I have to deal with RepositoryItem and its descendants. Thank you in advance. Ying

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  • Create Generic method constraining T to an Enum

    - by johnc
    I'm building a function to extend the Enum.Parse concept that allows a default value to be parsed in case that an Enum value is not found Is case insensitive So I wrote the following public static T GetEnumFromString<T>(string value, T defaultValue) where T : Enum { if (string.IsNullOrEmpty(value)) return defaultValue; foreach (T item in Enum.GetValues(typeof(T))) { if (item.ToString().ToLower().Equals(value.Trim().ToLower())) return item; } return defaultValue; } I am getting a Error Constraint cannot be special class 'System.Enum' Fair enough, but is there a workaround to allow a Generic Enum, or am I going to have to mimic the Parse function and pass a type as an attribute, which forces the ugly boxing requirement to your code. EDIT All suggestions below have been greatly appreciated, thanks Have settled on (I've left the loop to maintain case insensitivity - I am usng this when parsing XML) public static class EnumUtils { public static T ParseEnum<T>(string value, T defaultValue) where T : struct, IConvertible { if (!typeof(T).IsEnum) throw new ArgumentException("T must be an enumerated type"); if (string.IsNullOrEmpty(value)) return defaultValue; foreach (T item in Enum.GetValues(typeof(T))) { if (item.ToString().ToLower().Equals(value.Trim().ToLower())) return item; } return defaultValue; } }

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  • How to access generic property without knowing the closed generic type

    - by Martin Booka Weser
    I have a generic Type as follows public class TestGeneric<T> { public T Data { get; set; } public TestGeneric(T data) { this.Data = data; } } If i have now an object (which is coming from some external source) from which i know that it's type is of some closed TestGeneric<, but i don't know the TypeParameter T. Now I need to access the Data of my object. Problem is that i can't cast the object, since i don't know exactly to which closed TestGeneric. I use // thx to http://stackoverflow.com/questions/457676/c-reflection-check-if-a-class-is-derived-from-a-generic-class private static bool IsSubclassOfRawGeneric(Type rawGeneric, Type subclass) { while (subclass != typeof(object)) { var cur = subclass.IsGenericType ? subclass.GetGenericTypeDefinition() : subclass; if (rawGeneric == cur) { return true; } subclass = subclass.BaseType; } return false; } to make sure, my object is of the generic type. The code in question is as follows: public static void Main() { object myObject = new TestGeneric<string>("test"); // or from another source if (IsSubclassOfRawGeneric(typeof(TestGeneric<>), myObject.GetType())) { // the following gives an InvalidCastException // var data = ((TestGeneric<object>)myObject).Data; // if i try to access the property with reflection // i get an InvalidOperationException var dataProperty = typeof(TestGeneric<>).GetProperty("Data"); object data = dataProperty.GetValue(myObject, new object[] { }); } } I need the Data regardless of its type (well, if i could ask for its type using GetType() would be fine, but not necessary) since i just want to dump it in xml using ToString(). Any suggestions? Thanx.

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  • Invalid Cast Exception in ASP.NET but not in WinForms

    - by Shadow Scorpion
    I have a problem in this code: public static T[] GetExtras <T>(Type[] Types) { List<T> Res = new List<T>(); foreach (object Current in GetExtras(typeof(T), Types)) { Res.Add((T)Current);//this is the error } return Res.ToArray(); } public static object[] GetExtras(Type ExtraType, Type[] Types) { lock (ExtraType) { if (!ExtraType.IsInterface) return new object[] { }; List<object> Res = new List<object>(); bool found = false; found = (ExtraType == typeof(IExtra)); foreach (Type CurInterFace in ExtraType.GetInterfaces()) { if (found = (CurInterFace == typeof(IExtra))) break; } if (!found) return new object[] { }; foreach (Type CurType in Types) { found = false; if (!CurType.IsClass) continue; foreach (Type CurInterface in CurType.GetInterfaces()) { try { if (found = (CurInterface.FullName == ExtraType.FullName)) break; } catch { } } try { if (found) Res.Add(Activator.CreateInstance(CurType)); } catch { } } return Res.ToArray(); } } When I'm using this code in windows application it works! But I cant use it on ASP page. Why?

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  • How to access a method on a generic datacontext which is only created at runtime

    - by Jeremy Holt
    I'm creating my generic DataContext using only the connectionString in the ctor. I have no issues in retrieving the table using DataContext.GetTable(). However, I need to also be able to retrieve entities of inline table functions. The dbml designer generates public IQueryable<testFunctionResult> testFunction() { return this.CreateMethodCallQuery<testFunctionResult>(this, ((MethodInfo)(MethodInfo.GetCurrentMethod()))); } The question is how do I get the MethodInfo.GetCurrentMethod() when the DataContext has no method called "testFunction", i.e.typeof(DataContext).GetMethod("testFunction") returns null? What I'm trying to achieve is something like: public class UnitofWork<T> { public UnitofWork(string connectionString) { this.DataContext = new DataContext(connectionString); } public UnitofWork(IQueryable<T> tableEntity) { _tableEntity = tableEntity; } public IQueryable<T> TableEntity { get { if (DataContext == null) return _tableEntity; var metaType = DataContext.Mapping.GetMetaType(typeof (T)); if (metaType.IsEntity) _tableEntity = DataContext.GetTable<T>(); else { var s = typeof(T).Name; string methodName = s.Substring(0, s.IndexOf("Result")) + "()"; // the designer automatically affixes "Result" to the type name // Make a method from methodName // _tableEntity = DataContext.CreateMethodCallQuery(DataContext, method, new object[]{}); } return _tableEntity; } set { _tableEntity = value; } } ) Thanks in advance for any insight Jeremy

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  • Requested Service not found - .NET Remoting

    - by bharat
    I am Getting this exception System.Runtime.Remoting.RemotingException occurred Message="Object '/55337266_9751_4f58_8446_c54ff254222e/rkutlpt5hvsxipmzhb+jkqyl_98.rem' has been disconnected or does not exist at the server." Source="mscorlib" StackTrace: Server stack trace: at System.Runtime.Remoting.Channels.ChannelServices.CheckDisconnectedOrCreateWellKnownObject(IMessage msg) at System.Runtime.Remoting.Channels.ChannelServices.DispatchMessage(IServerChannelSinkStack sinkStack, IMessage msg, IMessage& replyMsg) Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at Common.Interface.Repository.NA.INRR.GetNRun(Int32 NetworkRunId) at Module.NA.ViewModel.NRDViewModel.get_AS() InnerException: Most of the times i am getting this exception this is my remotingDomain method string tcpURL; TcpChannel channel; channel = new TcpChannel(); ChannelServices.RegisterChannel(channel, false); //-- // Remote domain objects //-- tcpURL = string.Format("tcp://{0}:{1}/DomainComposition", ServerName, TcpPort); RemotingConfiguration.RegisterWellKnownClientType(typeof(DomainComposition), tcpURL); //-- // Remote repository objects //-- tcpURL = string.Format("tcp://{0}:{1}/RepositoryComposition", ServerName, TcpPort); RemotingConfiguration.RegisterWellKnownClientType(typeof(RepositoryComposition), tcpURL); //-- // Remote utility objects //-- tcpURL = string.Format("tcp://{0}:{1}/UtilityComposition", ServerName, TcpPort); RemotingConfiguration.RegisterWellKnownClientType(typeof(UtilityComposition), tcpURL); this.Domain = new DomainComposition(); this.Repository = new RepositoryComposition(); this.Utility = new UtilityComposition(); How to Check if the object is disconnect then re initiate the service

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  • Visual Studio Designer looses / ignores data

    - by Kempeth
    I'm writing my own control - a datagridviewcolumn that displays integer values as texts like the comboboxcolumn can but without showing the combobox unless the cell is edited. I'm mostly there but I have problems with the databinding. I managed to get the necessary properties to appear in the designer but every time I set the datasource and close the editor the changes are dropped. When I assign the same datasource later in code it works like a charm, I just would prefer not having to do that... public class DataGridViewLookupColumn : DataGridViewColumn { private DataGridViewLookupCell template; private Object datasource = null; private String displaymember = String.Empty; private String valuemember = String.Empty; private BindingSource bindingsource = new BindingSource(); public DataGridViewLookupColumn() : base() { this.template = new DataGridViewLookupCell(); } public override DataGridViewCell CellTemplate { get { return this.template; } set { } } [Category("Data")] [ DefaultValue(null), RefreshProperties(RefreshProperties.Repaint), AttributeProvider(typeof(IListSource)), DesignerSerializationVisibility(DesignerSerializationVisibility.Visible), ] public object DataSource { get { return this.bindingsource.DataSource; //return this.datasource; } set { this.bindingsource.DataSource = value; this.bindingsource.EndEdit(); } } [Category("Data")] [ DefaultValue(""), TypeConverterAttribute("System.Windows.Forms.Design.DataMemberFieldConverter, System.Design"), Editor("System.Windows.Forms.Design.DataMemberFieldEditor, System.Design", typeof(System.Drawing.Design.UITypeEditor)), DesignerSerializationVisibility(DesignerSerializationVisibility.Visible), ] public String DisplayMember { get { return this.displaymember; } set { this.displaymember = value; } } [Category("Data")] [ DefaultValue(""), TypeConverterAttribute("System.Windows.Forms.Design.DataMemberFieldConverter, System.Design"), Editor("System.Windows.Forms.Design.DataMemberFieldEditor, System.Design", typeof(System.Drawing.Design.UITypeEditor)), DesignerSerializationVisibility(DesignerSerializationVisibility.Visible), ] public String ValueMember { get { return this.valuemember; } set { this.valuemember = value; } } } EDIT: I experimenting I just found out that that original DataGridViewComboBoxColumn can be made to behave exactly like I wanted to. By setting the DisplayStyle to Nothing the combobox control is only shown in edit mode.

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