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  • VB.Net Dynamically Load DLL

    - by hermiod
    I am trying to write some code that will allow me to dynamically load DLLs into my application, depending on an application setting. The idea is that the database to be accessed is set in the application settings and then this loads the appropriate DLL and assigns it to an instance of an interface for my application to access. This is my code at the moment: Dim SQLDataSource As ICRDataLayer Dim ass As Assembly = Assembly. _ LoadFrom("M:\MyProgs\WebService\DynamicAssemblyLoading\SQLServer\bin\Debug\SQLServer.dll") Dim obj As Object = ass.CreateInstance(GetType(ICRDataLayer).ToString, True) SQLDataSource = DirectCast(obj, ICRDataLayer) MsgBox(SQLDataSource.ModuleName & vbNewLine & SQLDataSource.ModuleDescription) I have my interface (ICRDataLayer) and the SQLServer.dll contains an implementation of this interface. I just want to load the assembly and assign it to the SQLDataSource object. The above code just doesn't work. There are no exceptions thrown, even the Msgbox doesn't appear. I would've expected at least the messagebox appearing with nothing in it, but even this doesn't happen! Is there a way to determine if the loaded assembly implements a specific interface. I tried the below but this also doesn't seem to do anything! For Each loadedType As Type In ass.GetTypes If GetType(ICRDataLayer).IsAssignableFrom(loadedType) Then Dim obj1 As Object = ass.CreateInstance(GetType(ICRDataLayer).ToString, True) SQLDataSource = DirectCast(obj1, ICRDataLayer) End If Next EDIT: New code from Vlad's examples: Module CRDataLayerFactory Sub New() End Sub ' class name is a contract, ' should be the same for all plugins Private Function Create() As ICRDataLayer Return New SQLServer() End Function End Module Above is Module in each DLL, converted from Vlad's C# example. Below is my code to bring in the DLL: Dim SQLDataSource As ICRDataLayer Dim ass As Assembly = Assembly. _ LoadFrom("M:\MyProgs\WebService\DynamicAssemblyLoading\SQLServer\bin\Debug\SQLServer.dll") Dim factory As Object = ass.CreateInstance("CRDataLayerFactory", True) Dim t As Type = factory.GetType Dim method As MethodInfo = t.GetMethod("Create") Dim obj As Object = method.Invoke(factory, Nothing) SQLDataSource = DirectCast(obj, ICRDataLayer) EDIT: Implementation based on Paul Kohler's code Dim file As String For Each file In Directory.GetFiles(baseDir, searchPattern, SearchOption.TopDirectoryOnly) Dim assemblyType As System.Type For Each assemblyType In Assembly.LoadFrom(file).GetTypes Dim s As System.Type() = assemblyType.GetInterfaces For Each ty As System.Type In s If ty.Name.Contains("ICRDataLayer") Then MsgBox(ty.Name) plugin = DirectCast(Activator.CreateInstance(assemblyType), ICRDataLayer) MessageBox.Show(plugin.ModuleName) End If Next I get the following error with this code: Unable to cast object of type 'SQLServer.CRDataSource.SQLServer' to type 'DynamicAssemblyLoading.ICRDataLayer'. The actual DLL is in a different project called SQLServer in the same solution as my implementation code. CRDataSource is a namespace and SQLServer is the actual class name of the DLL. The SQLServer class implements ICRDataLayer, so I don't understand why it wouldn't be able to cast it. Is the naming significant here, I wouldn't have thought it would be.

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  • ActionScript/Flex ArrayCollection of Number objects to Java Collection<Long> using BlazeDS

    - by Justin
    Hello, I am using Flex 3 and make a call through a RemoteObject to a Java 1.6 method and exposed with BlazeDS and Spring 2.5.5 Integration over a SecureAMFChannel. The ActionScript is as follows (this code is an example of the real thing which is on a separate dev network); import com.adobe.cairngorm.business.ServiceLocator; import mx.collections.ArrayCollection; import mx.rpc.remoting.RemoteObject; import mx.rpc.IResponder; public class MyClass implements IResponder { private var service:RemoteObject = ServiceLocator.getInstance().getRemoteOjbect("mySerivce"); public MyClass() { [ArrayElementType("Number")] private var myArray:ArrayCollection; var id1:Number = 1; var id2:Number = 2; var id3:Number = 3; myArray = new ArrayCollection([id1, id2, id3]); getData(myArray); } public function getData(myArrayParam:ArrayCollection):void { var token:AsyncToken = service.getData(myArrayParam); token.addResponder(this.responder); //Assume responder implementation method exists and works } } This will make a call, once created to the service Java class which is exposed through BlazeDS (assume the mechanics work because they do for all other calls not involving Collection parameters). My Java service class looks like this; public class MySerivce { public Collection<DataObjectPOJO> getData(Collection<Long> myArrayParam) { //The following line is never executed and throws an exception for (Long l : myArrayParam) { System.out.println(l); } } } The exception that is thrown is a ClassCastException saying that a java.lang.Integer cannot be cast to a java.lang.Long. I worked around this issue by looping through the collection using Object instead, checking to see if it is an Integer, cast it to one, then do a .longValue() on it then add it to a temp ArraList. Yuk. The big problem is my application is supposed to handle records in the billions from a DB and the id will overflow the 2.147 billion limit of an integer. I would love to have BlazeDS or the JavaAdapter in it, translate the ActionScript Number to a Long as specified in the method. I hate that even though I use the generic the underlying element type of the collection is an Integer. If this was straight Java, it wouldn't compile. Any ideas are appreciated. Solutions are even better! :)

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  • Concatenate int and string in LINQ

    - by Waheed
    HI, I am using the following code from c in Country where c.IsActive.Equals(true) orderby c.CountryName select new { countryIDCode = c.CountryID + "|" + c.TwoDigitCode, countryName = c.CountryName } but following is the error while doing this... Unable to cast the type 'System.Int32' to type 'System.Object'. LINQ to Entities only supports casting Entity Data Model primitive types. CountryID is int type and TwoDigitCode is string type. Can u please let me know how to concatenate.... Thanks....

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  • Importing Sql Server 2005 database into Sql Server express 2008

    - by Matthew Kanwisher
    Is there any way to import a database backup from 2005 into 2008 express edition. What I've had to resort to is doing a script the database, then import all the data through DTS. Whenever I tried to import straight from a backup file it says something about not being to import into a new version of sql server or I'll get the below error. title: Microsoft SQL Server Management Studio Specified cast is not valid. (SqlManagerUI)

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  • What .Net Namespace contains Entity for use in a generic repository?

    - by Sara
    I have a question that I'm ashamed to ask, but I'm going to have a go at it anyway. I am creating a generic repository in asp.net mvc. I came across an example on this website which I find to be exactly what I was looking for, but there is one problem. It references an object - Entity - and I don't know what namespace it is in. I typically create my repositories and use Entity Framework but I decided to use a generic repository because I am using the same code in multiple projects over and over again. Here is the code: public interface IRepository { void Save(ENTITY entity) where ENTITY : Entity; void Delete<ENTITY>(ENTITY entity) where ENTITY : Entity; ENTITY Load<ENTITY>(int id) where ENTITY : Entity; IQueryable<ENTITY> Query<ENTITY>() where ENTITY : Entity; IList<ENTITY> GetAll<ENTITY>() where ENTITY : Entity; IQueryable<ENTITY> Query<ENTITY>(IDomainQuery<ENTITY> whereQuery) where ENTITY : Entity; ENTITY Get<ENTITY>(int id) where ENTITY : Entity; IList<ENTITY> GetObjectsForIds<ENTITY>(string ids) where ENTITY : Entity; void Flush(); } Can someone please tell me what namespace Entity is in? As you can tell, a constraint is placed on the code so that it must be an Entity type. I know that there is an Entity in System.Data.Entity, but that isn't what I need. I have had instances before where I was looking for some namespace that took me forever to find, but I have searched and I'm unable to find the appropriate namespace to cast my generic items correctly. I could cast it as a class and be done with it, but it is bugging me that I can't find Entity anywhere. Can someone help me....please..... :-) Here is a link to the original post. http://stackoverflow.com/questions/1472719/asp-net-mvc-how-many-repositories

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  • Convert Object to String iPhone SDK

    - by Ploetzeneder
    Hello, I have got something strange: This Code does NOT Work: cell.imvstatus.image = [UIImage imageNamed:[[tutorials objectAtIndex:indexPath.row] objectForKey:@"image"] ]; This code works: cell.imvstatus.image = [UIImage imageNamed:@"ROR.png" ]; And in the object there is the value "ROR.png" Whats the problem at the above one? How can I find out a solution? Do i have to cast it to a string ?

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  • What is this exception ?

    - by Lalit
    I am getting this exception while reading the shapes in excel sheet in c#: on code line of if (worksheet.Shapes.Count >= iCurrentRowIndex) {} Unable to cast COM object of type 'System.__ComObject' to interface type 'Microsoft.Office.Interop.Excel._Worksheet'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{000208D8-0000-0000-C000-000000000046}' failed due to the following error: The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD)).

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  • Casting of interfaces

    - by Srinivas Reddy Thatiparthy
    interfaces provide a useful abstraction capability. One can have a class Foo implement some interfaces, say A, B, and C. Some client code may get a reference of type A, others one of type B, etc. each actually the same Foo object but the interface exposing only a narrow subset of the functionality. Of course, evil client code can try to cast the A reference to Foo, then access the other functionality.How to prevent this?

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  • Entityframework 4.0 .CreateQuery<T> and OrderBy exception

    - by Sammy
    Hi Guys, I thought this was fixed in 4.0 I have this method public IQueryable<T> All(Expression<Func<T,object>> sort) { return EntityContext.CreateQuery<T>(EntityName).AsQueryable<T>().OrderBy(sort); } this throws the following exception Unable to cast the type 'System.Int32' to type 'System.Object'. LINQ to Entities only supports casting Entity Data Model primitive types. Source is System.Data.Entity any idea how to fix this or if theres any workaround

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  • bitmap data as movie clip

    - by Ross
    Hi, I import my images with imageLoader.contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete); imageLoader.load(imageRequest); and then try and cast as a movieclip: var newImage:MovieClip = imageLoader.content as MovieClip; addChild(newImage); i keep getting errors, is this possible? Thanks, Ross

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  • Is it possible to Take object members directly from a queue of type object?

    - by Luke Mcneice
    Hi all, If I where to have a Queue holding a collection of objects (Custom object,bool,bool,bool,bool) and the custom object holds three doubles itself. Can I use the .Take(IntegerValue) command to only take one of the doubles (for the specified take length) from the custom entity contained in the queue and cast it to a double array, possibly with the .ToArray<double> function? Thanks, Luke

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  • Bitwise operation on void* in C#

    - by code poet
    So I am Reflector-ing some framework 2.0 code and end up with the following deconstruction fixed (void* voidRef3 = ((void*) & _someMember)) { ... } This won't compile due to 'The right hand side of a fixed statement assignment may not be a cast expression' I understand that Reflector can only approximate and generally I can see a clear path but this is a bit outside my experience. Question: what is Reflector trying to describe to me? Update: Am also seeing the following fixed (IntPtr* ptrRef3 = ((IntPtr*) & this._someMember))

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  • Best way to get all digits from a string with regex

    - by Chris Marisic
    Is there any better way to get take a string such as "(123) 455-2344" and get "1234552344" from it than doing this: var matches = Regex.Matches(input, @"[0-9]+", RegexOptions.Compiled); return String.Join(string.Empty, matches.Cast<Match>() .Select(x => x.Value).ToArray()); Perhaps a regex pattern that can do it in a single match? I couldn't seem to create one to achieve that though.

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  • Not finding field in polymorphic association with Doctrine2

    - by dimirc
    I have a polymorphic association (Class Table Inheritance) and I need use DQL to query entities of a specific child class wich can be done using "x INSTANCE OF Entity" in WHERE clause. Now I need to put conditions specific for that child class but I get this error: "Class Person has no association named student_field_1" Person = Parent Class Employee = Child class Student = Child class is there any way yo cast of somehow tell Doctrine that the Person is actually a Student and to allow me to put Student fields in the WHERE?

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  • How To: UiBinder + GWT MVP + multiple independent display areas

    - by Prt Yz
    I am using GWT MVP and UiBinder to create an app with a DockLayoutPanel. I want the north and south docks to be static, containing buttons and links. I want to have dynamic views in the center and two different areas of the east dock. As these dynamic areas should be independent of each other, I am setting up different ActivityMapper and ActivityManager's for each dynamic display area; center, east-top, and east-bottom. How can I independently initialize these 3 different display areas when the application is loaded? How can I switch from one Activity to another in one display area without affecting the other areas? When I use the the PlaceController's goTo to switch from one Place to another in one area, the other area's Activity is stopped. Mayday, please help, mayday! The following is some of my code: AppViewImpl.ui.xml <g:DockLayoutPanel styleName="{style.dockPanel}" unit="PX" width="975px" height="100%"> <!-- DOCK PANEL EAST --> <g:east size="220"> <g:LayoutPanel styleName="{style.eastPanel}"> <g:layer left="0px" width="220px" top="0px" height="105px"> <g:SimpleLayoutPanel ui:field="topRightPanel"/> </g:layer> <g:layer left="0px" width="220px" top="110px" height="340px"> <g:InlineLabel styleName="{style.label}" text="ANOTHER DISPLAY AREA"/> </g:layer> </g:LayoutPanel> </g:east> <!-- DOCK PANEL NORTH --> <g:north size="110"> <g:LayoutPanel styleName="{style.northPanel}"> <g:layer left="0px" width="755px" top="0px" height="105px"> <g:InlineLabel styleName="{style.label}" text="NORTH PANEL"/> </g:layer> </g:LayoutPanel> </g:north> <!-- DOCK PANEL SOUTH --> <g:south size="20"> <g:LayoutPanel styleName="{style.southPanel}"> <g:layer left="0px" width="755px" top="0px" height="20px"> <g:InlineLabel styleName="{style.label}" text="SOUTH PANEL"/> </g:layer> </g:LayoutPanel> </g:south> <!-- DOCK PANEL CENTER --> <g:center> <g:SimpleLayoutPanel ui:field="mainPanel" /> </g:center> </g:DockLayoutPanel> MyModule.java public class MyModule implements EntryPoint { private Place defaultPlace = new DefaultPlace(""); public void onModuleLoad() { // Create ClientFactory using deferred binding so we can replace with // different impls in gwt.xml ClientFactory clientFactory = GWT.create(ClientFactory.class); EventBus eventBus = clientFactory.getEventBus(); PlaceController placeController = clientFactory.getPlaceController(); // Start ActivityManager for the main widget with our ActivityMapper ActivityMapper topRightActivityMapper = new TopRightActivityMapper(clientFactory); ActivityManager topRightActivityManager = new ActivityManager(topRightActivityMapper, eventBus); topRightActivityManager.setDisplay(clientFactory.getAppView().getTopRightPanel()); // Start ActivityManager for the main widget with our ActivityMapper ActivityMapper mainActivityMapper = new AppActivityMapper(clientFactory); ActivityManager mainActivityManager = new ActivityManager(mainActivityMapper, eventBus); mainActivityManager.setDisplay(clientFactory.getAppView().getMainPanel()); // Start PlaceHistoryHandler with our PlaceHistoryMapper AppPlaceHistoryMapper historyMapper = GWT .create(AppPlaceHistoryMapper.class); PlaceHistoryHandler historyHandler = new PlaceHistoryHandler(historyMapper); historyHandler.register(placeController, eventBus, defaultPlace); RootLayoutPanel.get().add(clientFactory.getAppView()); // Goes to place represented on URL or default place historyHandler.handleCurrentHistory(); new AppController(clientFactory); } } AppController.java public class AppController implements AppView.Presenter { private ClientFactory clientFactory; AppController(ClientFactory clientFactory){ this.clientFactory = clientFactory; goTo(new TopRightAPlace("")); } @Override public void goTo(Place place) { clientFactory.getPlaceController().goTo(place); } } TopRightAViewImpl.java public class TopRightAViewImpl extends Composite implements TopRightAView { interface Binder extends UiBinder<Widget, TopRightAViewImpl> { } private static final Binder binder = GWT.create(Binder.class); private Presenter listener; @UiField Button button; public TopRightAViewImpl() { initWidget(binder.createAndBindUi(this)); } @Override public void setName(String name) { button.setHTML(name); } @Override public void setPresenter(Presenter listener) { this.listener = listener; } @UiHandler("button") void onButtonClick(ClickEvent event) { listener.goTo(some other place); } }

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  • Casting and getting values from date picker and time picker in android

    - by Rahul Varma
    Hi , I have a date picker and a time picker in my app. Can anyone tell me how to get the values of the date and time that are selected??? What i mean to say is, for EditText we can declare as final EditText Name = (EditText) this.findViewById(R.id.nametext); and we can cast the data of it by using Name.getText().toString(). So similarly how can we get the values of date picker and time picker to a string???

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  • java console input

    - by Bipul
    The data type of the any input through console (as i do using BufferedReader class) is String.After that we type cast it to requered data type(as Inter.parseInt() for integer).But in C we can take input of any primitive data type whereas in java all input types are neccerily String.why it is so????

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  • Use of * in Objective C Syntax

    - by user263097
    I'm struggling a bit with some objective c syntax. Can someone please elaborate on the usage of * in the following instance method. - (IBAction)sliderChanged:(id)sender{ UISlider *slider = (UISlider *)sender; } I realize that we are creating a variable typed as UISlider and then setting it to sender once it is cast as a UISlider. However, I don't understand what the * are for and why UISlider slider = (UISlider)sender; won't work.

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  • casting udp streams in perl

    - by user314536
    hello. my Perl scripts gets a udp response that is built out of 2 integers + float numbers. the problem is that the udp streams is one long stream of bytes. how do i cast the stream into parameters using Perl ?

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  • WPF 4, ListView and ListCollectionView custom sorting

    - by JustABill
    I'm trying to use a custom sort with a ListView, as described in this blog entry. I'm doing ListCollectionView view = (ListCollectionView)CollectionViewSource.GetDefaultView(TheList.ItemsSource); as recommended there and in several other places, but for some reason I'm getting "Unable to cast object of type 'MS.Internal.Data.EnumerableCollectionView' to type 'System.Windows.Data.ListCollectionView'." (TheList is of type ListView). What could be causing this?

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