c# 把字符串生成代码 并执行

using System; using System.Reflection; using System.Globalization; using Microsoft.CSharp;using System.CodeDom; using System.CodeDom.Compiler;using System.Text; namespace ConsoleApplication1 {    public class Program      {        static void Main(string[] args)          {            // 1.CSharpCodePrivoder              CSharpCodeProvider objCSharpCodePrivoder = new CSharpCodeProvider();            // 2.ICodeComplier              ICodeCompiler objICodeCompiler = objCSharpCodePrivoder.CreateCompiler();            // 3.CompilerParameters              CompilerParameters objCompilerParameters = new CompilerParameters();              objCompilerParameters.ReferencedAssemblies.Add("System.dll");              objCompilerParameters.GenerateExecutable = false;              objCompilerParameters.GenerateInMemory = true;            // 4.CompilerResults              CompilerResults cr = objICodeCompiler.CompileAssemblyFromSource(objCompilerParameters, GenerateCode());            if (cr.Errors.HasErrors)              {                  Console.WriteLine("编译错误：");                foreach (CompilerError err in cr.Errors)                  {                      Console.WriteLine(err.ErrorText);                  }              }            else              {                // 通过反射，调用HelloWorld的实例                  Assembly objAssembly = cr.CompiledAssembly;                object objHelloWorld = objAssembly.CreateInstance("DynamicCodeGenerate.HelloWorld");                  MethodInfo objMI = objHelloWorld.GetType().GetMethod("OutPut");                  Console.WriteLine(objMI.Invoke(objHelloWorld, null));              }              Console.ReadLine();          }        static string GenerateCode()          {              StringBuilder sb = new StringBuilder();              sb.Append("using System;");              sb.Append(Environment.NewLine);              sb.Append("namespace DynamicCodeGenerate");              sb.Append(Environment.NewLine);              sb.Append("{");              sb.Append(Environment.NewLine);              sb.Append("      public class HelloWorld");              sb.Append(Environment.NewLine);              sb.Append("      {");              sb.Append(Environment.NewLine);              sb.Append("          public string OutPut()");              sb.Append(Environment.NewLine);              sb.Append("          {");              sb.Append(Environment.NewLine);              sb.Append("               return "Hello world!";");              sb.Append(Environment.NewLine);              sb.Append("          }");              sb.Append(Environment.NewLine);              sb.Append("      }");              sb.Append(Environment.NewLine);              sb.Append("}");            string code = sb.ToString();              Console.WriteLine(code);              Console.WriteLine();            return code;          }      }}