usingSystem;
usingSystem.Reflection;
usingSystem.Globalization;
usingMicrosoft.CSharp;
usingSystem.CodeDom;
usingSystem.CodeDom.Compiler;
usingSystem.Text;
 
namespaceConsoleApplication1
{
    publicclassProgram
    {
        staticvoidMain(string[]args)
        {
            // 1.CSharpCodePrivoder
            CSharpCodeProvider objCSharpCodePrivoder=newCSharpCodeProvider();
 
            // 2.ICodeComplier
            ICodeCompiler objICodeCompiler=objCSharpCodePrivoder.CreateCompiler();
 
            // 3.CompilerParameters
            CompilerParameters objCompilerParameters=newCompilerParameters();
            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 incr.Errors)
                {
                    Console.WriteLine(err.ErrorText);
                }
            }
            else
            {
                // 通过反射，调用HelloWorld的实例
                Assembly objAssembly=cr.CompiledAssembly;
                objectobjHelloWorld=objAssembly.CreateInstance("DynamicCodeGenerate.HelloWorld");
                MethodInfo objMI=objHelloWorld.GetType().GetMethod("OutPut");
 
                Console.WriteLine(objMI.Invoke(objHelloWorld,null));
            }
 
            Console.ReadLine();
        }
 
        staticstringGenerateCode()
        {
            StringBuilder sb=newStringBuilder();
            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("}");
 
            stringcode=sb.ToString();
            Console.WriteLine(code);
            Console.WriteLine();
 
            returncode;
        }
    }
}