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反射基本功能：

① 在程序运行过程中读取和修改对象中的参数（属性、方法、字段等）

② 通过反射对程序进行更新，不需要改动原程序

反射作用1练习：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace fanshe
{class student{public int age;public string name;public int ID { get; set; }public student(string Name){this.name = Name;}public void show(){Console.WriteLine("this is shown");}public void show2(string Age){Console.WriteLine($"this is {Age}");}}class Program{static void Main(string[] args){object obj = new student("jerry");Type x = obj.GetType();//反射作用：① 通过反射遍历成员，并调用成员//type的常用属性：Name;full name;namespaceConsole.WriteLine(x.Name);       //studentConsole.WriteLine(x.FullName);   //fanshe.studentConsole.WriteLine(x.Namespace);  //fansheforeach (var item in x.GetFields()){//显示出当前obj对象中的字段Console.WriteLine(item.Name);  //age name}//输出obj对象中age字段数值x.GetField(name: "age").SetValue(obj, 30);int y = (int)x.GetField(name: "age").GetValue(obj);Console.WriteLine(y);Console.WriteLine("//");//输出对象属性foreach (var item in x.GetProperties()){Console.WriteLine(item.Name);                   //IDConsole.WriteLine(item.PropertyType.Name);      //Int32Console.WriteLine(item.PropertyType.FullName);  //system.Int32}var id = x.GetProperty(name: "ID");id.SetValue(obj,100);Console.WriteLine(id.GetValue(obj));   //100Console.WriteLine("/");//输出obj对象中的方法foreach (var item in x.GetMethods()){Console.WriteLine(item.Name);}x.GetMethod(name: "show").Invoke(obj,null);x.GetMethod(name: "show2").Invoke(obj,new object[] {"jerry"});Console.ReadKey();}}
}

作用2练习：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Reflection;namespace ConsoleApplication1
{class Program{static void Main(string[] args){Console.WriteLine(Environment.CurrentDirectory);Assembly ss = Assembly.LoadFile(Environment.CurrentDirectory+ @"\libs\studentmanager.dll");foreach (var item in ss.GetTypes()){Console.WriteLine(item.Name);//使用is属性对参数进行过滤，找到想找的内容Console.WriteLine(item.IsClass);Console.WriteLine(item.IsAbstract);}Console.WriteLine("///");var t = ss.GetTypes().First(x=>x.IsAbstract==false && x.IsClass ==true);Console.WriteLine(t.Name);//此时是没有对象的，需要重新创建对象object obj =  ss.CreateInstance(t.FullName);t.GetProperty(name: "Age").SetValue(obj,30);t.GetProperty(name: "Name").SetValue(obj,"jerry");int kl =  (int)t.GetProperty(name: "Age").GetValue(obj);Console.WriteLine(kl);t.GetMethod(name: "show").Invoke(obj,new object[] { });//t.GetProperty(name: "Age").SetValue(obj,30);//t.GetProperty(name: "Name").SetValue(obj,"jerry");Console.ReadKey();}}
}