c# 反射

1. 普通反射

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
using System.Globalization;

namespace CSharp
{
    public class TestReflection
    {
        public TestReflection()
        {
            try
            {
                Type t = Type.GetType("CSharp.Apple2");
                Console.WriteLine("t is :{0}", t.ToString());

                object obj = System.Activator.CreateInstance(t);
                Console.WriteLine("t is :{0}", obj);

                //在创建实例的时候，默认执行了对应的构造函数
                object obj2 = System.Activator.CreateInstance(t,new object[]{"sdf",2});
                Console.WriteLine();
                //获取字段信息：
                FieldInfo[] fiList = t.GetFields();
                
                //只能读取公共的field
                foreach (FieldInfo fi in fiList)
                {
                    Console.WriteLine("Name is : {0};IsPrivate :{1};IsPublic:{2};IsStatic:{3};FieldType:{4}",
                        new object[]{fi.Name,fi.IsPrivate,fi.IsPublic,fi.IsStatic,fi.FieldType});

                    fi.SetValue(obj, "Hello World");
                    Console.WriteLine("Field {0}'s value is : {1}", fi.Name, fi.GetValue(obj));
                }
                Console.WriteLine();
                PropertyInfo[] piList = t.GetProperties();
                foreach (PropertyInfo pi in piList)
                {
                    Console.WriteLine("Name is : {0};CanRead :{1};CanWrite:{2};PropertyType:{3}",
                       new object[] { pi.Name,pi.CanRead,pi.CanWrite,pi.PropertyType});

                    
                    //t.InvokeMember(pi.Name, BindingFlags.SetProperty, null, obj, new object[] { "sdf" });
                    
                    //object o1 = System.Activator.CreateInstance(pi.PropertyType);
                    //pi.SetValue(obj, , null);
                }

                PropertyInfo pii = t.GetProperty("Color");
                t.InvokeMember(pii.Name, BindingFlags.SetProperty, null, obj, new object[]{"I am color"});
                Console.WriteLine("obj.color is :{0}",pii.GetValue(obj,null));

                Console.WriteLine();
                MethodInfo[] miList = t.GetMethods();
                foreach (MethodInfo _mi in miList)
                {
                    Console.WriteLine("Name is : {0};ReturnType :{1};MemberType:{2};",
                       new object[] { _mi.Name,_mi.ReturnType,_mi.MemberType });

                    ParameterInfo[] paramInfoList = _mi.GetParameters();

                    Console.WriteLine();
                    Console.WriteLine(_mi.Name + " 's params is :");

                    foreach (ParameterInfo paramInfo in paramInfoList)
                    {

                        Console.WriteLine("Param Name is : {0};ParameterType :{1};Position:{2};",
                       new object[] { paramInfo.Name, paramInfo.ParameterType,paramInfo.Position });
                    }
                }
                Console.WriteLine();
                MethodInfo mi = t.GetMethod("BuyApple");
                object value = mi.Invoke(obj, new object[] { 3 });
                Console.WriteLine("mi.invoke BuyApple : {0}", value);

                t.InvokeMember(mi.Name, BindingFlags.InvokeMethod, null, obj, new object[] { 3 });
                Console.WriteLine("t.InvokeMember BuyApple : {0}", value);

            }
            catch (Exception e)
            {
                Console.WriteLine("Exception is : {0}", e.Message);
            }

            //Console.ReadLine();
        }
    }

    public class Apple2
    {
        //定义字段
        private string _color = "";
        private decimal _weight = 0;
        public string _test = "Hello";

        //定义跟字段对应的属性
        public string Color
        {
            get { return _color; }
            set { _color = value; } //这里的value是C#关键字。表示外面传入的值.
        }

        public decimal Weight
        {
            get { return _weight; }
            set { _weight = value; }
        }

        public Apple2()
        {

        }

        public Apple2(string s,int i)
        {
            Console.WriteLine("param s is :{0};param i is:{1} ",s,i);
        }

        public string BuyApple(int nums)
        {
            return "BuyApple";
        }

        public override string ToString()
        {
            return "I am Apple2";
        }
    }
}

 

2. 泛型反射