使用CSharpCodeProvider與.net 4.5測試版

Question

我最近安裝了Visual Studio 11測試版，並試圖更新現有的4.0項目以使用4.5。在程序中，它使用CSharpCodeProvider編譯一些動態生成的代碼。

/// <summary> 
/// Compile and return a reference to the compiled assembly 
/// </summary> 
private Assembly Compile() 
{ 
    var referencedDlls = new List<string> 
    { 
     "mscorlib.dll", 
     "System.dll", 
     "System.Core.dll", 
    }; 
    referencedDlls.AddRange(RequiredReferences); 

    var parameters = new CompilerParameters(
     assemblyNames: referencedDlls.ToArray(), 
     outputName: GeneratedDllFileName, 
     // only include debug information if we are currently debugging 
     includeDebugInformation: Debugger.IsAttached); 
    parameters.TreatWarningsAsErrors = false; 
    parameters.WarningLevel = 0; 
    parameters.GenerateExecutable = false; 
    parameters.GenerateInMemory = false; 
    parameters.CompilerOptions = "/optimize+ /platform:x64"; 

    string[] files = Directory.GetFiles(GenerationDirectory, "*.cs"); 

    var compiler = new CSharpCodeProvider(
     new Dictionary<string, string> { { "CompilerVersion", "v4.5" } }); 
    var results = compiler.CompileAssemblyFromFile(parameters, files); 

    if (results.Errors.HasErrors) 
    { 
     string firstError = 
      string.Format("Compile error: {0}", results.Errors[0].ToString()); 
     throw new ApplicationException(firstError); 
    } 
    else 
    { 
     return results.CompiledAssembly; 
    } 
} 

問題是當我改變了CompilerVersion從{ "CompilerVersion", "v4.0" }到{ "CompilerVersion", "v4.5" }

我現在得到一個異常

編譯器可執行文件CSC.EXE無法找到。

是否指定CompilerVersion錯誤的方式告訴它使用4.5？將它編譯爲v4.5甚至會有所作爲，因爲代碼不會使用任何新的4.5特定功能？

Answer 1

如果你給我們一個簡短但完整的程序來演示這個問題會有幫助，但是我可以用「v4.0」驗證它會工作並編譯異步方法，假設你運行在安裝了VS11 beta的機器。

示範：

using System; 
using System.Collections; 
using System.Reflection; 
using System.Collections.Generic; 
using System.Diagnostics; 
using Microsoft.CSharp; 
using System.CodeDom.Compiler; 

namespace Foo {} 

class Program 
{ 
    static void Main(string[] args) 
    { 
     var referencedDll = new List<string> 
     { 
      "mscorlib.dll", 
      "System.dll", 
      "System.Core.dll", 
     }; 

     var parameters = new CompilerParameters(
      assemblyNames: referencedDll.ToArray(), 
      outputName: "foo.dll", 
      includeDebugInformation: false) 
     { 
      TreatWarningsAsErrors = true, 
      // We don't want to be warned that we have no await! 
      WarningLevel = 0, 
      GenerateExecutable = false, 
      GenerateInMemory = true 
     }; 

     var source = new[] { "class Test { static async void Foo() {}}" }; 

     var options = new Dictionary<string, string> { 
      { "CompilerVersion", "v4.0" } 
     }; 
     var compiler = new CSharpCodeProvider(options); 
     var results = compiler.CompileAssemblyFromSource(parameters, source); 

     Console.WriteLine("Success? {0}", !results.Errors.HasErrors); 
    } 
}