Question

为了将字符串转换为代码，我使用的是CodeDom编译器我在谈论在运行时编译C＃代码！
特别是我想用几个参数进行运行编译，哪些类型可以不同。

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

    static void Main()
    {
         String2LineOfCommand("P[0].ToString() + P[1].ToString()", new [] { 2, 4});
    }

    private void String2LineOfCommand(string expresion1, params object[] P)
    {
        MethodInfo function = CreateFunction(expresion1);
        object result = function.Invoke(null, P);
        Console.WriteLine(result.ToString());
    }

    public static MethodInfo CreateFunction(string function)
    {
        string code1 = @"
                        using System;
                        using System.Collections.Generic;
                        using System.Reflection;
                        using System.Dynamic;

                        namespace UserFunctions
                        {                
                            public class ParametricFunctions
                            {                
                                  public static object Function1(params int[] P)
                                  {
                                       return " +  function + @";
                                  }
                             }
                         }
                       ";

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

        CSharpCodeProvider provider = new CSharpCodeProvider(providerOptions);
        CompilerParameters cp = new CompilerParameters();
        cp.GenerateInMemory = true;
        cp.TreatWarningsAsErrors = false;
        cp.ReferencedAssemblies.Add("System.dll");
        cp.ReferencedAssemblies.Add("System.Core.dll");
        cp.ReferencedAssemblies.Add("System.Windows.dll");
        cp.ReferencedAssemblies.Add("System.Dynamic.dll");

        CompilerResults results = provider.CompileAssemblyFromSource(cp, code1);

        Type parametricFunction1 = results.CompiledAssembly.GetType("UserFunctions.ParametricFunctions");
        return parametricFunction1.GetMethod("Function1");
    }

此代码工作得很好！
但正如我在谈论int类型参数之前告诉你的那样我在运行时讨论不同情况下不同类型的输入参数！

如果我要输入

     String2LineOfCommand("P[0].ToString() + P[1].ToString()", 2, 4);

而不是

     String2LineOfCommand("P[0].ToString() + P[1].ToString()", new [] { 2, 4});

然后我会收到一条错误消息：

   An unhandled exception of type 'System.Reflection.TargetParameterCountException' occurred in mscorlib.dll
   Additional information: Parameter count mismatch.

请告诉我原因？

还要看看......

       public static MethodInfo CreateFunction(string function)

当我尝试输入

时

       public static object Function1(params object[] P)

而不是

       public static object Function1(params int[] P)

它显示了一条错误消息：

      An unhandled exception of type 'System.ArgumentException' occurred in mscorlib.dll
      Additional information: Object of type 'System.Int32[]' cannot be converted to type 'System.Object[]'.

但是当我尝试输入

时

      public static object Function(params dynamic[] P)

编译失败，没有关于错误的消息！
我想我错过了一个参考！
动态关键字适用于.net 4.0
我已写过：

      providerOptions.Add("CompilerVersion", "v4.0");

但没有结果！

请帮助我！

Answer 1

CompilerResults类具有Errors属性。编译失败的错误就在那里。

代码使它适用于动态（或对象，我不会在这里看到动态点）：

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

public class Program
{

    static void Main()
    {
        String2LineOfCommand("P[0].ToString() + P[1].ToString()", 2, 4);
    }

    private static void String2LineOfCommand(string expresion1, params dynamic[] P)
    {
        MethodInfo function = CreateFunction(expresion1);
        object result = function.Invoke(null, new[] { P });
        Console.WriteLine(result.ToString());
        Debug.WriteLine(result.ToString());
    }

    public static MethodInfo CreateFunction(string function)
    {
        string code1 = @"
                        using System;
                        using System.Collections.Generic;
                        using System.Reflection;
                        using System.Dynamic;

                        namespace UserFunctions
                        {                
                            public class ParametricFunctions
                            {                
                                  public static object Function1(dynamic[] P)
                                  {
                                       return " + function + @";
                                  }
                             }
                         }
                       ";

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

        CSharpCodeProvider provider = new CSharpCodeProvider(providerOptions);
        CompilerParameters cp = new CompilerParameters();
        cp.GenerateInMemory = true;
        cp.TreatWarningsAsErrors = false;
        cp.ReferencedAssemblies.Add("System.dll");
        cp.ReferencedAssemblies.Add("System.Core.dll");
        cp.ReferencedAssemblies.Add("System.Windows.dll");
        cp.ReferencedAssemblies.Add("System.Dynamic.dll");
        cp.ReferencedAssemblies.Add("Microsoft.CSharp.dll");

        CompilerResults results = provider.CompileAssemblyFromSource(cp, code1);

        Type parametricFunction1 = results.CompiledAssembly.GetType("UserFunctions.ParametricFunctions");
        return parametricFunction1.GetMethod("Function1");
    }
}

CodeDom编译期间字符串输入中的动态关键字

1 个答案: