c# - 将 C# 6 功能与 CodeDomProvider (Roslyn) 结合使用

Question

CodeDomProvider objCodeCompiler = CodeDomProvider.CreateProvider( "CSharp" );

CompilerParameters objCompilerParameters = new CompilerParameters();

...

CompilerResults objCompileResults = objCodeCompiler.CompileAssemblyFromFile( objCompilerParameters, files.ToArray() );

当我编译我的文件时，我得到:

FileFunctions.cs(347): Error: Unexpected character '$'

有谁知道如何使用 CodeDom 编译进行字符串插值？

我找到了这个链接:How to target .net 4.5 with CSharpCodeProvider?

所以我尝试了:

     var providerOptions = new Dictionary<string, string>();
     providerOptions.Add( "CompilerVersion", "v4.0" );

     // Instantiate the compiler.
     CodeDomProvider objCodeCompiler = CodeDomProvider.CreateProvider( "CSharp", providerOptions );

但我仍然得到同样的错误。

我还将目标框架更新为 .NET Framework 4.6。

注意:我不能指定“v4.5”或“v4.6”，否则我会得到:

************** Exception Text **************
System.InvalidOperationException: Compiler executable file csc.exe cannot be found.
   at System.CodeDom.Compiler.RedistVersionInfo.GetCompilerPath(IDictionary`2 provOptions, String compilerExecutable)
   at Microsoft.CSharp.CSharpCodeGenerator.FromFileBatch(CompilerParameters options, String[] fileNames)
   at Microsoft.CSharp.CSharpCodeGenerator.System.CodeDom.Compiler.ICodeCompiler.CompileAssemblyFromFileBatch(CompilerParameters options, String[] fileNames)
   at System.CodeDom.Compiler.CodeDomProvider.CompileAssemblyFromFile(CompilerParameters options, String[] fileNames)
   at Dynamic.CodeDOMCompiler.CompileAllCodeFiles() in C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\Core\CodeDOMCompiler.cs:line 93
   at NewForm.InitializeSystem() in C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\NewForm.cs:line 179
   at NewForm.NewForm_Load(Object sender, EventArgs e) in C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\NewForm.cs:line 111
   at System.Windows.Forms.Form.OnLoad(EventArgs e)

我已经尝试使用 Thomas Levesque 的建议:

CodeDomProvider objCodeCompiler = new Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider();

但后来我得到:

************** Exception Text **************
System.IO.DirectoryNotFoundException: Could not find a part of the path 'C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\bin\x86\Debug\bin\roslyn\csc.exe'.
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost)
   at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share)
   at Microsoft.CodeDom.Providers.DotNetCompilerPlatform.Compiler.get_CompilerName()
   at Microsoft.CodeDom.Providers.DotNetCompilerPlatform.Compiler.FromFileBatch(CompilerParameters options, String[] fileNames)
   at Microsoft.CodeDom.Providers.DotNetCompilerPlatform.Compiler.CompileAssemblyFromFileBatch(CompilerParameters options, String[] fileNames)
   at System.CodeDom.Compiler.CodeDomProvider.CompileAssemblyFromFile(CompilerParameters options, String[] fileNames)
   at Dynamic.CodeDOMCompiler.CompileAllCodeFiles() in C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\Core\CodeDOMCompiler.cs:line 87
   at NewForm.InitializeSystem() in C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\NewForm.cs:line 179
   at NewForm.NewForm_Load(Object sender, EventArgs e) in C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\NewForm.cs:line 111
   at System.Windows.Forms.Form.OnLoad(EventArgs e)

我不确定它为什么要在我的 bin 目录的子文件夹中寻找“csc.exe”。

这条路径存在:

C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\bin\x86\Debug\roslyn

但它正在寻找:

C:\Users\Derek.Morin\Documents\Visual Studio 2010\Projects\ScriptCode\ScriptCode.ConvertedToC#\bin\x86\Debug\bin\roslyn\csc.exe

Answer 1

Update: March 2018

Word of caution, NuGet version 1.0.6 ... 1.0.8 will not copy the /roslyn folder to the build output directory on non-web projects. Best stick with 1.0.5 https://github.com/aspnet/RoslynCodeDomProvider/issues/38

如 @thomas-levesque 所述，使用 C#6 功能进行运行时编译需要新的编译器。可以使用 nuget 包安装此编译器 Microsoft.CodeDom.Providers.DotNetCompilerPlatform .

对于桌面应用程序，有一个问题。 ASP.NET 团队以其无限的智慧将编译器的路径硬编码为 <runtime-directory>\bin\roslyn\csc.exe。见讨论 https://github.com/dotnet/roslyn/issues/9483

如果您的桌面应用程序编译为 \myapp\app.exe , roslyn 编译器将位于 \myapp\roslyn\csc.exe , 但是CSharpCodeProvider将解决 csc.exe作为\myapp\bin\roslyn\csc.exe

据我所知，你有两个选择

1. 创建将移动 \roslyn 的构建后和/或安装例程子目录到 \bin\roslyn .
2. 通过反射黑魔法修复运行时代码。

这是#2，通过公开 CSharpCodeProvider作为实用程序类中的属性。

using System.Reflection;
using Microsoft.CodeDom.Providers.DotNetCompilerPlatform;

static Lazy<CSharpCodeProvider> CodeProvider { get; } = new Lazy<CSharpCodeProvider>(() => {
    var csc = new CSharpCodeProvider();
    var settings = csc
        .GetType()
        .GetField("_compilerSettings", BindingFlags.Instance | BindingFlags.NonPublic)
        .GetValue(csc);

    var path = settings
        .GetType()
        .GetField("_compilerFullPath", BindingFlags.Instance | BindingFlags.NonPublic);

    path.SetValue(settings, ((string)path.GetValue(settings)).Replace(@"bin\roslyn\", @"roslyn\"));

    return csc;
});