.net-4.0

I have 2 MEF components. Let it be component A and component B. What I need is to be able to access a class from component B in component A without referencing to it. Then I would like to instantiate object of the class manually. Currently I see MEF allows instantiating an object automatically using [Import]. It uses interface which requires to be referenced to. Can I use data types from another assemblies without referencing to it? Is there such mechanism supported by MEF? There are a couple of ways to do this. First, you need to define a common interface that both assemblies understand. This

I've set up my DataContext like this: <Window.DataContext> <c:DownloadManager /> </Window.DataContext> Where DownloadManager is Enumerable<DownloadItem> . Then I set my DataGrid like this: <DataGrid Name="dataGrid1" ItemsSource="{Binding Path=/}" ... So that it should list all the DownloadItems, right? So I should be able to set my columns like: <DataGridTextColumn Binding="{Binding Path=Uri, Mode=OneWay}" Where Uri is a property of the DownloadItem . But it doesn't seem to like this. In the visual property editor, it doesn't recognize Uri is a valid property, so I'm guessing I'm doing

I'm trying to set up a ContentTemplate that changes based on a DataTrigger. Syntatically, I feel like this should work, but it results in a stack overflow when trying to render the page: <ItemsControl ItemsSource="{Binding Path=ExtendedFieldCollection}" ItemTemplate="{StaticResource RequiredFieldsTemplate}" /> <!--Where--> <DataTemplate x:Key="RequiredFieldsTemplate"> <ContentPresenter> <ContentPresenter.Style> <Style TargetType="ContentPresenter"> <Setter Property="ContentTemplate" Value="{x:Null}"/> <Style.Triggers> <DataTrigger Binding="{Binding IsRequired}" Value="True"> <Setter Property=

I want to make a custom control in my website (note: not web application) Following is the code using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.ComponentModel; using System.Web.UI; using System.Web.UI.WebControls; namespace AnkitControls { /// <summary> /// Summary description for CustomTreeView /// </summary> public class CustomTreeViewControl : WebControl { } } Default.aspx : <%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <%@ Register Assembly=

From Richter and this discussion , I would expect any two "identical" strings to be the same reference. But just now in LINQPad I got mixed results on this topic. Here is the code: void Main() { string alpha = String.Format("Hello{0}", 5); string brava = String.Format("Hello{0}", 5); ReferenceEquals(alpha, brava).Dump(); String.IsInterned(alpha).Dump(); String.IsInterned(brava).Dump(); alpha = "hello"; brava = "hello"; ReferenceEquals(alpha, brava).Dump(); } And here are the results from the Dump() calls: False Hello5 Hello5 True I would have expected both the first and last ReferenceEquals to