MSBuildWorkspace.OpenSolutionAsync 抛出异常

Question

完整代码如下：

MSBuildWorkspace msBuild = MSBuildWorkspace.Create();
Solution sln = await msBuild.OpenSolutionAsync(solutionPath);//NullReferenceException

其中 solutionPath 是有效的 .sln Visual Studio 2015 解决方案。我尝试了一个 Winforms 新项目和一个带有简单 class 的 dll。我在尝试阅读之前关闭了该解决方案，但这没有帮助。它仍然抛出 NullReferenceException。我正在使用 VS2015。 x64 Windows 10.

MSBuildWorkspace 是不是 Workspace 的错误类型？还缺什么吗？

_{(NullReferenceException 实际上是一个方法抛出的奇怪错误。这通常是 mistakenNull.DoSomething(); 之类的东西抛出的错误类型。)}

编辑 2 - 此代码位于解决方案的 dll 项目中，该解决方案还包含一个调用此代码的简单 Winforms 项目。（因为 Roslyn 项目模板创建了一个 dll 项目。）也许这很重要。

编辑 - 堆栈跟踪

异常: 对象引用未设置到对象的实例。

堆栈跟踪：

   at Microsoft.CodeAnalysis.CSharp.CSharpProjectFileLoader.CSharpProjectFile.GetReferences(CSharpCompilerInputs compilerInputs, ProjectInstance executedProject, IEnumerable`1& metadataReferences, IEnumerable`1& analyzerReferences)
   at Microsoft.CodeAnalysis.CSharp.CSharpProjectFileLoader.CSharpProjectFile.CreateProjectFileInfo(CSharpCompilerInputs compilerInputs, ProjectInstance executedProject)
   at Microsoft.CodeAnalysis.CSharp.CSharpProjectFileLoader.CSharpProjectFile.<GetProjectFileInfoAsync>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at Microsoft.CodeAnalysis.MSBuild.MSBuildWorkspace.<LoadProjectAsync>d__40.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.MSBuild.MSBuildWorkspace.<GetOrLoadProjectAsync>d__39.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.MSBuild.MSBuildWorkspace.<OpenSolutionAsync>d__34.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at namespace1.RosTest.<RenameMethods>d__0.MoveNext() in C:\Users\...

Answer 1

您需要确保在您的申请旁边包含 Microsoft.CodeAnalysis.CSharp.Workspaces.dll 和/或 Microsoft.CodeAnalysis.VisualBasic.Workspaces.dll。

工作区代码动态加载它们。

Answer 2

我遇到了同样的问题，当我安装了正确版本的 "Microsoft.CodeAnalysis.CSharp" 从下方组装 link.

https://www.nuget.org/packages/Microsoft.CodeAnalysis.CSharp/

这可能对某些人有所帮助，所以我在这里发帖。

MSBuildWorkspace.OpenSolutionAsync 抛出异常

MSBuildWorkspace.OpenSolutionAsync throws an Exception

.net

c#

roslyn

编辑 - 堆栈跟踪