为什么会出现异常：无法从程序集“ System.Xaml”加载类型“ xy”？

Question

I have a WPF application with the .Net 4 client profile framework. When I installed it on a new Windows XP machine, with the .NET 4 Client profile installed. I have this error message on lunching the app.

Could not load type 'System.Windows.Markup.ValueSerializerAttribute' from assembly 'System.Xaml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'.

I checked for the System.Xaml.dll , it's there in :

C:\\WINDOWS\\Microsoft.NET\\Framework\\v4.0.30319

Any ideas ? Thanks in advance.

EDIT :

I found this information on the msdn website :

Platforms : Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Ser ver Core supported with SP1 or later), Windows Server 2003 SP2

Answer 1

You are properly missing the VisualStudio C++ Runtimes . This is a big problem with DevExpress so you may got another exception:

FileNotFoundExeption that is "normal" on new PCs and DevExpress

Answer 2

The problem was solved when I did an update of DevExpress from 12.2.4 to 13.1.4. Don't know why exactly, but it solved the problem.