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  • WPF: OnRender and Hit Testing

    - by stefan.at.wpf
    Hello, when using OnRender to draw something on the screen, is there any way to perform Hit Testing on the drawn graphics? Sample Code protected override void OnRender(System.Windows.Media.DrawingContext drawingContext) { base.OnRender(drawingContext); drawingContext.DrawRectangle(Brushes.Black, null, new Rect(50, 50, 100, 100)); } Obviously one has no reference to the drawn Rectangle which would be necessary to perform hit testing or am I wrong about this? I know I can use DrawingVisual, I'm just curious if my understanding is correct, that using OnRender to draw something you can't perform any hit testing on the drawn things?

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  • RIA Services Filter descriptor

    - by Mohit
    I have a Filterdescriptor as shown below. The propertypath is of type 'char?' I get following InvalidOperationException when I filter by entering a value Y InnerException {System.InvalidOperationException: A FilterDescriptor with its PropertyPath equal to 'Valid' cannot be evaluated. --- System.ArgumentException: Operator 'StartsWith' incompatible with operand types 'Char?' and 'Char?' --- System.ArgumentNullException: Value cannot be null. Parameter name: method at System.Linq.Expressions.Expression.ValidateCallArgs(Expression instance, MethodInfo method, ReadOnlyCollection1& arguments) at System.Linq.Expressions.Expression.Call(Expression instance, MethodInfo method, IEnumerable1 arguments) at System.Linq.Expressions.Expression.Call(Expression instance, MethodInfo method, Expression[] arguments) at System.Windows.Controls.LinqHelper.GenerateMethodCall(String methodName, Expression left, Expression right) at System.Windows.Controls.LinqHelper.GenerateStartsWith(Expression left, Expression right) at System.Windows.Controls.LinqHelper.BuildFilterExpression(Expression propertyExpression, FilterOperator filterOperator, Expression valueExpression, Boolean isCaseSensitive, Expression& filterExpression) --- End of inner exception stack trace --- --- End of inner exception stack trace ---} System.Exception {System.InvalidOperationException}

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  • To get the parent node of a treeview in the TreeViewDragDropTarget in Silverlight

    - by Ramya
    Hi, I have created a TreeViewDragDropTarget like this, <controlsToolKit:TreeViewDragDropTarget msWindows:DragDrop.AllowDrop="False" ItemDroppedOnTarget="TreeViewDragDropTarget_ItemDroppedOnTarget" ItemDragCompleted="TreeViewDragDropTarget_ItemDragCompleted" AllowedSourceEffects="Copy"> <controlsToolKit:TreeViewDragDropTarget.Resources> <common:HierarchicalDataTemplate x:Key="hierarchicalTemplate" ItemsSource="{Binding ChildNode}"> <TextBlock Text="{Binding MainText, Mode=TwoWay}" TextWrapping="Wrap"/> </common:HierarchicalDataTemplate> </controlsToolKit:TreeViewDragDropTarget.Resources> <controls:TreeView x:Name="MainTreeView" BorderThickness="1" ItemTemplate="{StaticResource hierarchicalTemplate}" Background="Transparent" Cursor="Hand" BorderBrush="{x:Null}" VerticalAlignment="Top"/> </controlsToolKit:TreeViewDragDropTarget> All I am doing is dropping some text into the nodes of the treeview. I want to find the parent node of the drop target. How do I do it?

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  • Should I suppress CA1062: Validate arguments of public methods?

    - by brickner
    I've recently upgraded my project to Visual Studio 2010 from Visual Studio 2008. In Visual Studio 2008, this Code Analysis rule doesn't exist. Now I'm not sure if I should use this rule or not. I'm building an open source library so it seems important to keep people safe from doing mistakes. However, if all I'm going to do is throw ArgumentNullException when the parameter is null, it seems like writing useless code since ArgumentNullException will be thrown even if I won't write that code. Should I remove that rule or fix the violations?

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  • multiple key ranges as parameters to a couchdb view

    - by kolosy
    is there a way to send multiple startKey/endKey pairs to a view, akin to the keys: [] array that can be posted for keys? the underlying problem - let's say my documents have "categories" and timestamps. if i want all documents in the "foo" category that have a timestamp that's within the last two hours, it's simple: function (doc) { emit([doc.category, doc.timestamp], null); } and then query as GET server:5894/.../myview?startKey=[foo, |now - 2 hours|]&endkey=[foo, |now|] the problem comes when i want something in categories foo or bar, within the last two hours. if i didn't care about time, i could just pull directly by key through the keys collection. unfortunately, i have no such option with ranges. what i ended up doing in the meantime is rounding the timestamp to two-hour blocks, and then multiplexing the query out: POST server:5894/.../myview keys=[[foo, 0 hours], [foo, 2 hours], [bar, 0 hours], [bar, 2 hours]] it works, but will get messy if i want to go back a large amount of time (in relationship to the blocksize)

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  • WCF CreateMessage from custom body xml

    - by Cecil
    I have the following code: string body = "<custom xml>"; XDocument doc = XDocument.Parse(body); MemoryStream stream = new MemoryStream(); XmlWriter writer = XmlWriter.Create(stream); if (writer != null) { doc.Save(writer); writer.Flush(); writer.Close(); } stream.Position = 0; XmlReader rd = XmlReader.Create(stream); Message output = Message.CreateMessage(msg.Version, msg.Headers.Action, rd); output.Headers.CopyHeadersFrom(msg); output.Properties.CopyProperties(msg.Properties); When I try to use the message I get the following error: hexadecimal value 0x02, is an invalid character. Line 1, position 2. Any idea why? And what I can do to fix this?

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  • How to get the value of a SELECT HtmlElement in C# webBrowser control

    - by AndrewW
    Hi, In a C# WebBrowser control, I have generated a SELECT HtmlElement with a number of OPTION elements using w.RenderBeginTag(HtmlTextWriterTag.Select). I need to get the value of the select when the user changes it, and so added an event handler in the WebBrowser DocumentCompleted event. private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) { .... webBrowser1.Document.GetElementById("id_select_0").AttachEventHandler("onchange", new EventHandler(ddSelectedIndexChanged)); .... } protected void ddSelectedIndexChanged(object sender, EventArgs e) { .... } The event handler does get called, but the sender parameter is null and e is empty. Does anyone know how to overcome this problem? Andrew

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  • creating Linq to sqlite dbml from DbLinq source code

    - by Veer
    Hi All, I tried to create linq-to-sqlite dbml using DbLinq but in vain. Each time I get different type of errors. May be I'm somewhere wrong. Can anyone tell me the step by step procedure to create the dbml file from the Dblinq source code. Edit: Steps I Followed: I downloaded the source file from this link. Edited the "run_sqliteMetal.bat" file in \\DbLinq-0.19\src\DbMetal folder as 'DbMetal.exe -database:myDb.db3 -namespace:myNS -code:myCode.cs' -dbml:myDbml.dbml Tried to run the DbMetal project file to produce the executable but there was a runtime error since Options object in Parameters.cs was null. Hence downloaded the readymade exe file from this location Copied it into the \DbLinq-0.19\src\DbMetal folder Executed the "run_sqliteMetal.bat" file I got a blank screen and Windows Error Msg "DbLinq has stopped Working" Any help? Thanks in advance, Veer

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  • How to crop the UIImage?

    - by Rajendra Bhole
    Hi, I develop an application in which i process the image using its pixels but in that image processing it takes a lot of time. Therefore i want to crop UIImage (Only middle part of image i.e. removing/croping bordered part of image).I have the develop code are, - (NSInteger) processImage1: (UIImage*) image { CGFloat width = image.size.width; CGFloat height = image.size.height; struct pixel* pixels = (struct pixel*) calloc(1, image.size.width * image.size.height * sizeof(struct pixel)); if (pixels != nil) { // Create a new bitmap CGContextRef context = CGBitmapContextCreate( (void*) pixels, image.size.width, image.size.height, 8, image.size.width * 4, CGImageGetColorSpace(image.CGImage), kCGImageAlphaPremultipliedLast ); if (context != NULL) { // Draw the image in the bitmap CGContextDrawImage(context, CGRectMake(0.0f, 0.0f, image.size.width, image.size.height), image.CGImage); NSUInteger numberOfPixels = image.size.width * image.size.height; NSMutableArray *numberOfPixelsArray = [[[NSMutableArray alloc] initWithCapacity:numberOfPixelsArray] autorelease]; } How i take(croping outside bordered) the middle part of UIImage?????????

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  • SmtpClient.SendAsync code review

    - by Lieven Cardoen
    I don't know if this is the way it should be done: { ... var client = new SmtpClient {Host = _smtpServer}; client.SendCompleted += SendCompletedCallback; var userState = mailMessage; client.SendAsync(mailMessage, userState); ... } private static void SendCompletedCallback(object sender, AsyncCompletedEventArgs e) { // Get the unique identifier for this asynchronous operation. var mailMessage= (MailMessage)e.UserState; if (e.Cancelled) { Log.Info(String.Format("[{0}] Send canceled.", mailMessage)); } if (e.Error != null) { Log.Error(String.Format("[{0}] {1}", mailMessage, e.Error)); } else { Log.Info("Message sent."); } mailMessage.Dispose(); } Disposing the mailMessage after the client.SendAsync(...) throws an error. So I need to dispose it in the Callback handler.

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  • ASP.NET MVC Pass mutiple params from getJson to controller

    - by andyJ
    Hi, I am making a call to a controller action in javascript using the getJson method. I need to pass two parameters to my action method on the controller, but I am struggling to do so. I do not fully understand the routing tables and not sure if this is what I need to use to get this working. Please see example below of what I am trying to do. var action = "<%=Url.Content('~/Postcode/GetAddressResults/')%>" + $get("Premise").value + "/" + $get("SearchPostcode").value $.getJSON(action, null, function(data) { $("#AddressDropDown").fillSelect(data); }); This is my route which I don't understand how to make use of... routes.MapRoute( "postcode", "Postcode/GetAddressResults/{premise}/{postcode}", new { controller = "Motor", action = "GetAddressResults", premise = "", postcode = "" });

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  • Cannot create multiple instances of PowerPoint

    - by Excel20
    I'm working on a project where I need to use PowerPoint from C#.net. Initially, I always created one single instance. As of today, I would like to have multiple instance running. I do that like so: Type powerpointType = Type.GetTypeFromProgID("PowerPoint.Application"); object instance1 = Activator.CreateInstance(powerpointType); object instance2 = Activator.CreateInstance(powerpointType); but when I ask for the handle of both instances, by calling hwnd = (int)powerpointType.GetProperty("HWND").GetValue(instance1, null); then I get the same handle twice. My conclusion is that the application is started just once, and the TaskManager comfirms that: Only one process. How come there is only one instance of PowerPoint running, and how can I make it work?

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  • problem with tabbed interface as mentioned in the article of josh smith

    - by Egi
    hello guys, i ve got a problem with my programm. here is the link: http://dl.dropbox.com/u/2734432/TabbedInterface.7z once u have opened both tabs, u ll start loosing the references to other collections of the current item in the view. that is because these ids are nullable and once you switch over to the other tab they ll become null. my question is why and how can i corrent that behavoir? if you change the int? to int there are no more problem, but i need them to be nullable!

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  • System.DirectoryServices.AccountManagement functions fail to probe some machines (but not others)

    - by JCCyC
    Both the working and failing targets are machines in the same domain. Code is down below. When I use it against some machines in my domain, I get a System.DirectoryServices.AccountManagement.PrincipalOperationException with a message: "While trying to retrieve the authorization groups, an error (1332) occurred." The error is thrown by GetAuthorizationGroups(). Note: The username I use to connect is a local admin to the machine in both cases. PrincipalContext ctx = new PrincipalContext(ContextType.Machine, machineName, domainname + "\\" + adminusername, pass); List<Principal> retList = new List<Principal>(); using (var user = UserPrincipal.FindByIdentity(ctx, probedusername)) { if (user != null) { PrincipalSearchResult<Principal> groups = user.GetAuthorizationGroups(); foreach (Principal group in groups) { retList.Add(group); } } }

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  • HttpWebResponse with MJPEG and multipart/x-mixed-replace; boundary=--myboundary response content typ

    - by arri.me
    I have an ASP.NET application that I need to show a video feed from a security camera. The video feed has a content type of 'multipart/x-mixed-replace; boundary=--myboundary' with the image data between the boundaries. I need assistance with passing that stream of data through to my page so that the client side plugin I have can consume the stream just as it would if I browsed to the camera's web interface directly. The following code does not work: //Get response data byte[] data = HtmlParser.GetByteArrayFromStream(response.GetResponseStream()); if (data != null) { HttpContext.Current.Response.OutputStream.Write(data, 0, data.Length); } return;

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  • asp fpdf trying to output a image assigned to a variable

    - by bluffo
    this is the code i used to display image in the header. the problem i have is i want to use a variable for the image, when i put the variable name instead of the image name i get an error: Microsoft JScript runtime error '800a138f' 'undefined' is null or not an object /EKtestdb/fpdf/fpdf/includes/Basics.asp, line 121 this.Header=function Header() { this.SetY (10) this.SetFont ("Times","",10) //this.Cell (45,5, "HEADER", 0, 0, "L") this.SetFont ("Times","b",14) //this.Cell (190,5, this.title, 0, 0, "C") this.Cell (190,20, this.title, 0, 0) this.SetFont ("Times","",10) this.Image('logoSM1.jpg',165,3,33) this.Image( techpic ,165,3,33) this is the code for basics.asp line 121: this.strrpos=function strrpos(s,ch){ res = s.lastIndexOf(ch) if (res>0-1){return res}else{return false} } this.strpos=function strpos(s,ch,start){ if (arguments.length<3){start=0} res = s.indexOf(ch,start); if (res>-1){return res}else{return false} } if you just want to display an image this line should work: this.Image('logoSM1.jpg',165,3,33) but for using a variable instead of image name can someone help with this?

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  • SmartGWT Canvas width problem

    - by Doug
    I am having problems with showing my entire SmartGWT Canvas on my initial page. I've stripped everything out and am left with an extremely basic EntryPoint to illustrate my issue. When I just create a Canvas and add it to the root panel, I get a horizontal scrollbar in my browser. Can anyone explain why and what I can do to have the Canvas sized to the width of the window? Thanks in advance. public class TestModule implements EntryPoint { protected Canvas view = null; /** * This is the entry point method. */ public void onModuleLoad() { view = new Canvas(); view.setWidth100(); view.setHeight100(); view.setShowEdges( true ); RootPanel.get().add( view ); } }

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  • asp.net mvc making ajax call jason

    - by mazhar kaunain baig
    Controller: public ActionResult EditOrganizationMeta(int id) { } [HttpPost] [ValidateInput(false)] public ActionResult EditOrganizationMeta(FormCollection collection) { } View: function DoAjaxCall() { var url = '<%= Url.Action("EditOrganizationMeta", "Organization") %>'; //url = url + '/' + dd; $.post(url, null, function(data) { alert(data); }); } <input type="button" name="something" value="Save" onclick="DoAjaxCall()" /> how would i make the ajax call , i have basically two functions with the same name EditOrganizationMeta,Do the form collection will be passed automatically.Basic confusion is regarding the method call Ok i made a call by ajax but after that My This code is not running anymore [HttpPost] [ValidateInput(false)] public ActionResult EditOrganizationMeta(FormCollection collection) { int OrganizationId = 11; string OrganizationName = "Ministry of Interior"; try { string ids = Request.Params // **getting error here some sequence is not there** .Cast<string>() .Where(p => p.StartsWith("button")) .Select(p => p.Substring("button".Length)) .First(); String RealValueOfThatControl = collection[ids]; } } catch { } return RedirectToAction("EditOrganizationMeta", new { id = OrganizationId }); } I think that there is no post

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  • WPF: Apply ScrollBar Style to ListBox Template - Error object cannot be added to border

    - by TheMar
    Hi, I thought this may be straightforward question but did not find any definitive answer while searching net or SO. I have created scrollbar style (using standard scroll bard template - Blend 2) I am not sure how to apply this style "MyScrollStyle" to a ListBox Template . I saw on ListBox template they have Scroll Viewer -- which should contain the scrollbar Assuming it is something simple as ---Content Added--- After going through lot of xaml in template edit I kind of understood how to apply style. I am trying to add the scroll view style set in this example -http://blog.xamltemplates.net/wp-content/uploads/2008/12/scrollviewer.zip, to my list view template but it gives error -- System.Windows.Markup.XamlParseException was unhandled Message="'ScrollViewer' object cannot be added to 'Border'. Exception has been thrown by the target of an invocation. Error at object 'System.Windows.Controls.ScrollViewer' in markup file 'MenuModule, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null;component/resources/Resources.xaml' Line 19 Position 26." Source="PresentationFramework" LineNumber=19 LinePosition=26 NameContext="1_T" Any help is appreciated Thank you, The Mar

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  • Asynchronous Html.ImageGetter for setting multiple images in a TextView

    - by thedude19
    I'm writing an application that takes HTML pages and parses them to display on the screen. Specifically, this application pulls HTML from a message board and lists posts made by users. The problem is that a lot of the content in posts are pictures in <img> tags, so I need to write a Html.ImageGetter to handle the downloading of the images. My textView.setText() method will look like this: myTextView.setText(Html.fromHtml(myText, new ImageGetter() { @Override public Drawable getDrawable(String source) { Drawable d; // Need to async download image here return d; } }, null)); Doing this synchronously is trivial, but is there a suggested way to do this asynchronously so that it doesn't lock up my UI thread? I would also like to eventually build in caching of these images, but I imagine that would be pretty simple once the async downloading was there.

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  • MVC map to nullable bool in model

    - by fearofawhackplanet
    With a view model containing the field: public bool? IsDefault { get; set; } I get an error when trying to map in the view: <%= Html.CheckBoxFor(model => model.IsDefault) %> Cannot implicitly convert type 'bool?' to 'bool'. An explicit conversion exists (are you missing a cast?) I've tried casting, and using .Value and neither worked. Note the behaviour I would like is that submitting the form should set IsDefault in the model to true or false. A value of null simply means that the model has not been populated.

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  • How to pass object from one activity to another in android

    - by kaibuki
    Hi I am trying to work on sending an object of my "Customer" class from one activity and display on other activity. the code for the customer class : `package com.kaibuki; public class Customer { private String firstName, lastName, Address; int Age; public Customer(String fname, String lname, int age, String address) { firstName = fname; lastName = lname; Age = age; Address = address; } public String printValues() { String data = null; data = "First Name :" + firstName + " Last Name :" + lastName + " Age : " + Age + " Address : " + Address; return data; } } I want to send its object from one activity to another and then display the data on the other activity. Please need urgent help. Thanks alot Kai`

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  • SelectionChanged event binding in Silverlight+MVVM-Light

    - by Budda
    The handler of the "SelectionChanged" event of the ComboBox control has the following signature: void SelectionChangedMethod(object sender, SelectionChangedEventArgs e) How to bind to that property under Silverlight 4 and MVVM-Light to the corresponding method of the ViewModel object? As far as I know, I need to do something like this: public void Changed(Object obj, SelectionChangedEventArgs e) { // .... implement logic here } RelayCommand<Object, SelectionChangedEventArgs> _command; public ICommand ObjectSelectionChanged { get { if (_command == null) { _command = new RelayCommand<Object, SelectionChangedEventArgs>(Changed); } return _command; } } The problem is that RelayCommand class in the MVVM-Light framework doesn't support 2 generic parameters... Is there any solution or workaround for this case? How bind control event to the method with 2 parameters?

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  • WPF Binding Failure performance hit vs Exception

    - by Aran Mulholland
    when we bind to heterogeneous collection of objects, not all objects have the same set of properties. in the output window we get a message like: System.Windows.Data Error: 39 : BindingExpression path error: 'RoundingFactor' property not found on 'object' ''MultiLineTextMarkingScheme' (HashCode=7262386)'. BindingExpression:Path=RoundingFactor;.......... This doesn't appear to be an exception, but we are concerned it has a performance impact. Should we be concerned and create a view model that has all the properties we wish to bind to (and have the properties that dont exist on the underlying element return null) or can we just leave it. This situation often occurs in a grid scenario where there might be large numbers of these binding failures.

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  • Scheme homework help

    - by John
    Okay so I have started a new language in class. We are learning Scheme and i'm not sure on how to do it. When I say learning a new language, I mean thrown a homework and told to figure it out. A couple of them have got me stumped. My first problem is: Write a Scheme function that returns true (the Boolean constant #t) ifthe parameter is a list containing n a's followed by n b's. and false otherwise. Here's what I have right now: (define aequalb (lamda (list) (let ((head (car list)) (tail(cdr list))) (if(= 'a head) ((let ((count (count + 1))) (let (( newTail (aequalb tail)))) #f (if(= 'b head) ((let ((count (count - 1))) (let (( newTail (aequalb tail)))) #f (if(null? tail) (if(= count 0) #t #f))))))))))) I know this is completely wrong, but I've been trying so please take it easy on me. Any help would be much appreciated.

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