C＃無法將`System.Delegate'表達式轉換爲`PowellMethod.fcn_delegate'

Question

我試圖在運行時向一個類提供編譯的C＃函數。

我得到以下錯誤： 參數#1' cannot convert System.Delegate '表達鍵入`PowellMethod.fcn_delegate'

在主class.css

public delegate void fcn_delegate(int n, double[] x, double[] f, int iflag); 
static void Main() 
{ 

    PowellMethod powell = new PowellMethod(); 

    MethodInfo function = CreateFunction(StringFunction); // the function contents defined as a string 
    var betterFunction = (Func<int, double[], double[], int>)Delegate.CreateDelegate(typeof(Func<int, double[], double[], int>), function); 

    Delegate test = (fcn_delegate) Delegate.CreateDelegate(typeof(fcn_delegate), function); 

    //powell.dnsqe_nice(betterFunction,0, x,tol,bounds,ref fnorm,ref info); 
    powell.dnsqe_nice(test,0, x,tol,bounds,ref fnorm,ref info); 


} 

public static MethodInfo CreateFunction(string function) 
{ 
    string code = @" 
      using System; 

      namespace UserFunctions 
      {     
       public class BinaryFunction 
       {     
        public static void Function(int n, double[] x, double[] f, int iflag) 
        { 
         func_xy; 
        } 
       } 
      } 
     "; 

    string finalCode = code.Replace("func_xy", function); 

    CSharpCodeProvider provider = new CSharpCodeProvider(); 
    CompilerResults results = provider.CompileAssemblyFromSource(new CompilerParameters(), finalCode); 

    Type binaryFunction = results.CompiledAssembly.GetType("UserFunctions.BinaryFunction"); 
    return binaryFunction.GetMethod("Function"); 
} 

}

在PowellMethod.css

public delegate void fcn_delegate(int n, double[] x, double[] f, int iflag); 

public void dnsqe_nice(fcn_delegate fcn, int jac, double[] x, double tol, double[,] bounds, ref double fnorm,ref string info) 
    { 
// code .. 
} 

我試過（t est或更好的功能）。 什麼是這個System.Delegate，它爲什麼不同於PowellMethod中的委託定義？

請幫助..

Answer 1

OK，我設法找到了答案

的解決方案是

PowellMethod.fcn_delegate betterFunction = (PowellMethod.fcn_delegate)Delegate.CreateDelegate(typeof(PowellMethod.fcn_delegate), function); 

，它工作正常