C#反射获取 所有字段 及 私有字段

using System;  
using System.Collections.Generic;  
using System.Text;  
using System.Reflection;  
namespace ReflectionDemo  
{  
    class Program  
    {  
        static void Main(string[] args)  
        {  
            Type t = typeof(ChangeValue);  
            Type[] types = new Type[0];//为构造函数准备参数类型  
            ConstructorInfo ci = t.GetConstructor(types); //获得构造函数  
            object[] objs = new object[0];//为构造函数准备参数值  
            object obj = ci.Invoke(objs);//调用构造函数创建对象  
            MethodInfo mi = t.GetMethod("WriteLine");//获得公有的writeline方法  
            mi.Invoke(obj, null);  
            FieldInfo fi = t.GetField("myValue", BindingFlags.NonPublic | BindingFlags.Instance);//获得私有字段  
            FieldInfo[] fis=t.GetFields(BindingFlags.NonPublic | BindingFlags.Instance|BindingFlags.Public);  
            Console.WriteLine(fis.Length);  
            foreach (var fieldInfo in fis)  
            {  
                Console.WriteLine( fieldInfo.FieldType+":"+ fieldInfo.Name + ":" + fieldInfo.GetValue(obj) );  
            }  
            fi.SetValue(obj, "new Value"); //改写私有字段  
            mi.Invoke(obj, null);  
            MethodInfo mi2 = t.GetMethod("Write", BindingFlags.NonPublic | BindingFlags.Instance);//获得私有的Write方法  
            mi2.Invoke(obj, null);  
            Console.ReadLine();  
        }  
    }  
    public class ChangeValue  
    {  
        private string myValue = "old Value";  
        public string firstValue = "values1";  
        public void WriteLine()  
        {  
            Console.WriteLine("MyValue is: " + myValue);  
        }  
        private void Write()  
        {  
            Console.WriteLine("MyValue is: " + myValue);  
        }  
    }  
}