Question

我有一个使用此命令的自定义msbuild任务：

var workspace = Workspace.LoadStandAloneProject(csprojPath);

当我运行它时，它会抛出以下错误：

  System.InvalidCastException was unhandled by user code
  Message=Unable to cast transparent proxy to type 'Roslyn.Utilities.SerializableDataStorage'.
  Source=Roslyn.Services
  StackTrace:
       at Roslyn.Utilities.RemoteServices.CreateInstance[T]()
       at Roslyn.Services.Host.TemporaryStorageServiceFactory.CreateService(IWorkspaceServiceProvider workspaceServices)
       at Roslyn.Services.Host.WorkspaceServiceProviderFactory.Provider.c__DisplayClass7.b__4()
       at Roslyn.Utilities.NonReentrantLazy`1.get_Value()
       at Roslyn.Services.Host.WorkspaceServiceProviderFactory.Provider.GetService[TWorkspaceService]()
       at Roslyn.Services.SolutionServices..ctor(IWorkspaceServiceProvider workspaceServices, ILanguageServiceProviderFactory languageServicesFactory)
       at Roslyn.Services.Solution..ctor(SolutionId id, String filePath, VersionStamp version, VersionStamp latestProjectVersion, ILanguageServiceProviderFactory languageServiceProviderFactory, IWorkspaceServiceProvider workspaceServices)
       at Roslyn.Services.Host.SolutionFactoryServiceFactory.SolutionFactoryService.CreateSolution(SolutionId id)
       at Roslyn.Services.Host.TrackingWorkspace.CreateNewSolution(ISolutionFactoryService solutionFactory, SolutionId id)
       at Roslyn.Services.Host.TrackingWorkspace..ctor(IWorkspaceServiceProvider workspaceServiceProvider, Boolean enableBackgroundCompilation, Boolean enableInProgressSolutions)
       at Roslyn.Services.Host.HostWorkspace..ctor(IWorkspaceServiceProvider workspaceServiceProvider, Boolean enableBackgroundCompilation, Boolean enableInProgressSolutions, Boolean enableFileTracking)
       at Roslyn.Services.Host.LoadedWorkspace..ctor(ILanguageServiceProviderFactory languageServiceProviderFactory, IWorkspaceServiceProvider workspaceServiceProvider, IProjectFileService projectFileFactsService, IDictionary`2 globalProperties, Boolean enableBackgroundCompilation, Boolean enableFileTracking)
       at Roslyn.Services.Host.LoadedWorkspace..ctor(ExportProvider exportProvider, Boolean solutionLoadOnly, Boolean enableFileTracking)
       at Roslyn.Services.Host.LoadedWorkspace..ctor(Boolean enableFileTracking)
       at Roslyn.Services.Host.LoadedWorkspace.LoadStandAloneProject(String projectFileName, String configuration, String platform, String language, Boolean enableFileTracking)
       at Roslyn.Services.Workspace.LoadStandAloneProject(String projectFileName, String configuration, String platform, String language, Boolean enableFileTracking)
       ...

在控制台应用程序中使用相同项目运行时，相同的代码运行正常。

有什么想法吗？谷歌搜索没有帮助！

Answer 1

以下是Roslyn的MsBuild任务示例。

为了重建Workspace.LoadProjectFromCommandLineArguments方法所需的命令行，我们必须将msbuild文件中的一些信息传递给我们的任务。

引用的程序集： @（ReferencePath）项目组。
要编译的cs文件：@（编译）项目组。
基本目录：$（MSBuildProjectDirectory）内置属性。

这就是Roslyn需要解析源文件的全部内容。（参见本文末尾的注释。）

所以创建一个C＃类库项目。这些是您需要的项目参考：

Microsoft.Build.Framework
Microsoft.Build.Utilities.v4.0
Roslyn.Compilers
Roslyn.Services

自定义MsBuild任务的代码：

using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;
using Roslyn.Services;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace RoslynMsBuildTask
{
    public class RoslynTask : Task
    {
        [Required]
        public ITaskItem[] ReferencePath { get; set; }

        [Required]
        public ITaskItem[] Compile { get; set; }

        [Required]
        public ITaskItem BaseDirectory { get; set; }

        public override bool Execute()
        {
            Log.LogMessage(MessageImportance.High, "RoslynTask.Execute called...\n");

            // Format the command line with the minimal info needed for Roslyn to create a workspace.
            var commandLineForProject = string.Format("/reference:{0} {1}",
                ReferencePath.Select(i => i.ItemSpec).ToSingleString(",", "\"", "\""),
                Compile.Select(i => i.ItemSpec).ToSingleString(" ", "\"", "\""));

            // Create the Roslyn workspace.
            var workspace = Workspace.LoadProjectFromCommandLineArguments("MyProject", "C#", commandLineForProject, BaseDirectory.ItemSpec);

            // Make sure that Roslyn actually parsed the project: dump the source from a syntax tree to the build log.
            Log.LogMessage(MessageImportance.High, workspace.CurrentSolution.Projects.First()
                .Documents.First(i => i.FilePath.EndsWith(".cs")).GetSyntaxRoot().GetText().ToString());

            return true;
        }
    }

    public static class IEnumerableExtension
    {
        public static string ToSingleString<T>(this IEnumerable<T> collection, string separator, string leftWrapper, string rightWrapper)
        {
            var stringBuilder = new StringBuilder();

            foreach (var item in collection)
            {
                if (stringBuilder.Length > 0)
                {
                    if (!string.IsNullOrEmpty(separator))
                        stringBuilder.Append(separator);
                }

                if (!string.IsNullOrEmpty(leftWrapper))
                    stringBuilder.Append(leftWrapper);

                stringBuilder.Append(item.ToString());

                if (!string.IsNullOrEmpty(rightWrapper))
                    stringBuilder.Append(rightWrapper);
            }

            return stringBuilder.ToString();
        }
    }
}

要证明它确实有效，请在csproj文件的末尾添加以下行（就在关闭Project标记之前）。但是，只有项目已经成功构建并且它可以在输出文件夹中找到您的任务dll。

  <Target Name="AfterBuild" DependsOnTargets="RoslynTask"/>
  <UsingTask AssemblyFile="$(OutputPath)\RoslynMsBuildTask.dll" TaskName="RoslynMsBuildTask.RoslynTask" />
  <Target Name="RoslynTask">
    <RoslynTask ReferencePath="@(ReferencePath)" Compile="@(Compile)" BaseDirectory="$(MSBuildProjectDirectory)" />
  </Target>

它会将您的第一个cs文件的源转储到构建输出。

请注意，其他csc.exe开关（如ConditionalDirectives，输出类型等）可能也很重要，具体取决于您尝试执行的分析类型。您也可以使用此模式将它们传递给您的任务。有关MsBuild传递给csc.exe的完整属性列表，请参阅$（MSBuildToolsPath）\ Microsoft.CSharp.targets文件，CoreCompile目标，Csc任务。

Answer 2

这是MSBuild的限制。 Roslyn无法在构建期间递归调用MSBuild以确定项目属性/文件/引用。要在构建任务期间创建Roslyn IProject，请尝试使用LoadFromCommandLineArgs()方法。您需要构造您的任务以获取与CscTask最终传递给编译器相同的参数。

希望这有帮助！

Roslyn：工作区在控制台应用程序中加载，但在msbuild任务中没有

2 个答案: