动态编译C#代码并反射执行

using System;
using System.CodeDom.Compiler;
using System.Reflection;
using System.Text;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {

            Program p = new Program();
            if (p.CompileCode())
            {
                //反射动态编译的程序集DLL
                string dllPathName = AppDomain.CurrentDomain.BaseDirectory + @"MyTestClassLibrary.dll";
                Assembly assembly = Assembly.LoadFile(dllPathName);
                object o = assembly.CreateInstance("MyTestClassLibrary.ClassEntity");

                //反射类的属性并将属性值输出
                FieldInfo[] fieldInfos = o.GetType().GetFields();
                Console.WriteLine(fieldInfos[0].GetValue(o));
                Console.WriteLine(fieldInfos[1].GetValue(o));

                //反射类 该类所有方法
                MethodInfo[] methodInfos = o.GetType().GetMethods(BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance);
                foreach (MethodInfo info in methodInfos)
                {
                    Console.WriteLine(info.Name);
                }

                //反射调用有重载方法的
                //1 调用私有的无参重载方法
                MethodInfo methodInfo1 = o.GetType().GetMethod("HelloWorld", BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance, null, new Type[] { }, null);
                object returnObj1 = methodInfo1.Invoke(o, null);
                Console.WriteLine(returnObj1.ToString());

                //2 调用私有的有参重载方法
                MethodInfo methodInfo2 = o.GetType().GetMethod("HelloWorld", BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance, null, new Type[] { typeof(string) }, null);
                object returnObj2 = methodInfo2.Invoke(o, new object[] { "\tTest" });
                Console.WriteLine(returnObj2.ToString());
            }
            Console.Read();
        }

        public bool CompileCode()
        { 
            //动态将代码生成程序集
            CodeDomProvider provider = CodeDomProvider.CreateProvider("C#");
            CompilerParameters parameters = new CompilerParameters();
            parameters.GenerateExecutable = false;
            parameters.GenerateInMemory = false;
            parameters.OutputAssembly = AppDomain.CurrentDomain.BaseDirectory + @"MyTestClassLibrary.dll";
            CompilerResults compileResults = provider.CompileAssemblyFromSource(parameters, GenerateCode());
            if (compileResults.Errors.Count > 0)
            {
                Console.WriteLine("编译有错误:{0}", compileResults.Errors[0].ErrorText);
                return false;
            }
            else
                return true;

        }

        private string GenerateCode()
        {
            StringBuilder sb = new StringBuilder(2048);
            sb.Append("using System;\r\n");
            sb.Append("namespace MyTestClassLibrary\r\n");
            sb.Append("{\r\n");
            sb.Append("    public class ClassEntity\r\n");
            sb.Append("    {\r\n");
            sb.Append("        public const string TestProperty1 = \"1234567890\";\r\n");
            sb.Append("        public const string TestProperty2 = \"0987654321\";\r\n");
            sb.Append("        private string HelloWorld(string userName)\r\n");
            sb.Append("        {\r\n");
            sb.Append("            return DateTime.Now.ToString() + \"\t Hello\"+userName;\r\n");
            sb.Append("        }\r\n");
            sb.Append("        private string HelloWorld()\r\n");
            sb.Append("        {\r\n");
            sb.Append("            return DateTime.Now.ToString() + \"\t Hello\";\r\n");
            sb.Append("        }\r\n");
            sb.Append("    }\r\n");
            sb.Append("}\r\n");

            return sb.ToString();
        }
    }
}