VisualStudio bug?
.net, visual-studio, winforms, wpf
Solution
it sounds like you just need a reference to `System.Xaml.dll`
Re whether this is a bug in VS; well, I suppose the templates could add that reference - I can reproduce it, so it may be worth logging on connect
Problem
In VS 2010 created a new `WinForm` project. Added a new UserControl WPF. 2 compile-time errors appeared: Error 1 The type 'System.Windows.Markup.IQueryAmbient' is defined in an assembly that is not referenced. You must add a reference to assembly 'System.Xaml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'. D:\Projets\WindowsFormsApplication2\UserControl1.xaml.cs 20 26 WindowsFormsApplication2 Error 2 The type name 'IComponentConnector' could not be found in the namespace 'System.Windows.Markup'. This type has been forwarded to assembly 'System.Xaml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' Consider adding a reference to that assembly. D:\Projets\WindowsFormsApplication2\obj\x86\Debug\UserControl1.g.cs 41 100 WindowsFormsApplication2 NB. References like `PresenationCore.dll`, `PresenationFramework.dll`, `WindowsBase.dll` are added automatically when adding a new WPF UserControl to the WinForm project, so why not `System.Xaml.dll` too? ============== Bug reported on Microsoft Connect.