System.Reflection.Adds.UnresolvedAssemblyException

System.Reflection.Adds.UnresolvedAssemblyException
类型 Universe 无法解析程序集: System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a。

添加引用 C:\Program Files\Microsoft SDKs\Silverlight\v5.0\Libraries\Client

System.Xml.XPath.Xml