Visual studio 2010 在vs2015中打开vs2010 C#项目导致设计器出错

我可以访问代码，但无法打开设计器视图。我可以添加新项目并对其编码，只有现有项目的设计器视图返回这些错误

我还可以成功地运行和调试程序

唯一的问题是，现在我已经在vs2015上打开了它，它不能在vs2010中再次打开

我已经在谷歌上搜索了好几个小时，尝试了各种各样的东西，但还是没有运气

堆栈跟踪：

Error HRESULT E_FAIL has been returned from a call to a COM component
at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
at Microsoft.VisualStudio.LanguageServices.Implementation.Utilities.Exceptions.ThrowEFail()
at Microsoft.VisualStudio.LanguageServices.Implementation.CodeModel.CodeTypeRef.LookupTypeSymbol()
at Microsoft.VisualStudio.LanguageServices.Implementation.CodeModel.CodeTypeRef.get_TypeKind()
at EnvDTE.CodeTypeRef.get_TypeKind()
at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomParser.GetUrtTypeFromVsType(CodeTypeRef vsType)
at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomParser.OnTypePopulateMembers(Object sender, EventArgs e)
at System.CodeDom.CodeTypeDeclaration.get_Members()
at Microsoft.VisualStudio.Design.Serialization.CodeDom.MergedCodeDomParser.CodeTypeDeclarationPopulator.OnPopulateMembers(Object sender, EventArgs e)
at System.CodeDom.CodeTypeDeclaration.get_Members()
at System.ComponentModel.Design.Serialization.TypeCodeDomSerializer.Deserialize(IDesignerSerializationManager manager, CodeTypeDeclaration declaration)
at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager manager)
at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.DeferredLoadHandler.Microsoft.VisualStudio.TextManager.Interop.IVsTextBufferDataEvents.OnLoadCompleted(Int32 fReload)

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项目文件中的向后兼容性仅适用于VS 2012及以后版本。我相信，当它将项目文件转换为新格式时，它会备份旧的项目文件。检查项目中的备份文件夹。项目文件中的向后兼容性仅适用于VS 2012及以后版本。我相信，当它将项目文件转换为新格式时，它会备份旧的项目文件。检查项目中的备份文件夹。