类型“Uri”同时存在于“System.Private.Uri, Version=7.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a”和“System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089”中 [web.csx]csharp(CS0433)