c# 类的反射实例 (GetType().Invoke().GetMethod().CreateInstance())

原文：http://www.cnblogs.com/chenwei19/archive/2009/02/04/1384034.html

Class1和Form 窗体在同一个命名空间

 using System;
 using System.Collections.Generic;
 using System.Text;
 namespace fanshetest1
 {
     class Class1
     {
         private string ab="";
         public Class1(string aa)
         {
             a = aa;
         }
         public int  aa(int x,int y)
         {
             return x+y+x+y;
         }
         public string bb()
         {
             return "bb";
         }
         public static string cc()
         {
             return "cc";
         }
         public string AB
         {
             get
             {
                 return ab;
             }
             set
             {
                 ab = value;
             }
         }
         public string a;
     }
 }

Class1和Form 窗体在不同一个命名空间

 using System;
 using System.Collections.Generic;
 using System.Text;
 namespace fanshetest1
 {
     class Class1
     {
         private string ab="";
         public Class1(string aa)
         {
             a = aa;
         }
         public int  aa(int x,int y)
         {
             return x+y+x+y;
         }
         public string bb()
         {
             return "bb";
         }
         public static string cc()
         {
             return "cc";
         }
         public string AB
         {
             get
             {
                 return ab;
             }
             set
             {
                 ab = value;
             }
         }
         public string a;
     }
 }

下面是如何使用反射操作以上类；

 using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Text;
 using System.Windows.Forms;
 using System.Reflection;
 namespace fanshetest
 {
     public partial class Form1 : Form
     {
         System.Reflection.Assembly a;
         System.Reflection.Assembly b;
         public Form1()
         {
             InitializeComponent();
             a = System.Reflection.Assembly.LoadFrom("Class1.DLL");
         }
         private void button1_Click(object sender, EventArgs e)
         {
             gouzaohanshu();

         }
        //没有传参数，返回一个类型；
         private void One()
         {
             //再另建一个项目，在项目中引用上面生成的ClassLibrary1.DLL
             System.Type t = a.GetType("Class1.Class1");
             //动态生成ClassLibrary1.Class类的实例
             Object theObj = System.Activator.CreateInstance(t);
             //参数信息，GetSum需要两个string参数
             System.Type[] paramTypes = new System.Type[];
             paramTypes[] = System.Type.GetType("System.String");
             paramTypes[] = System.Type.GetType("System.String");
             //System.Reflection.MethodInfo mi = t.GetMethod("aa", paramTypes);
             System.Reflection.MethodInfo mi = t.GetMethod("bb");
             //参数值
             Object[] parameters = new Object[];
             parameters[] = ;
             parameters[] = ;
             Object returnValue = mi.Invoke(theObj, null);
             this.textBox1.Text = returnValue.ToString();
         }
         //没有返回值，调用的是直接执行函数
         private void None_void()
         {
             //再另建一个项目，在项目中引用上面生成的ClassLibrary1.DLL
             System.Type t = a.GetType("Class1.Class2");
             //动态生成ClassLibrary1.Class类的实例
             Object theObj = System.Activator.CreateInstance(t);
             //参数信息，GetSum需要两个string参数
             System.Type[] paramTypes = new System.Type[];
             //此处调用方法，如果有参数只需要在括号的后面加上"，" 加上参数的type[]类型的参数
             System.Reflection.MethodInfo mi = t.GetMethod("Mes");
             Object returnValue = mi.Invoke(theObj, null);
         }
         //没有返回值，传出参数接收返回值；
         private void Two()
         {
             Type t = a.GetType("Class1.Class1");
             Object theObj = Activator.CreateInstance(t);
             Type[] types=new Type[];
             types[]=Type.GetType("System.Int32");
             types[]=Type.GetType("System.Int32");
             Object[] obj=new Object[];
             obj[]=;
             obj[]=;
             MethodInfo mi = t.GetMethod("aa",types);
            Object returnValue=mi.Invoke(theObj,obj);
            this.textBox1.Text = returnValue.ToString();
         }
         //获取同一个命名空间的反射出值
         private void Local()
         {
             Type t=Type.GetType("fanshetest1.Class1");
             //创建一个 实例
             Object theObj = Activator.CreateInstance(t);
             Type[] types=new Type[];
             types[]=Type.GetType("System.Int32");
             types[] = Type.GetType("System.Int32");
             Object[] obj = new Object[];
             obj[] = ;
             obj[] = ;
             MethodInfo mi = t.GetMethod("aa",types);
             Object returnValue = mi.Invoke(theObj,obj);
             this.textBox1.Text = returnValue.ToString();
         }
         //获取出一个属性
         private void attribute()
         {
             a = Assembly.LoadFrom("Class1.dll");
             Type t = a.GetType("Class1.Class1");
             t = Type.GetType("fanshetest1.Class1");
             Object theObj = Activator.CreateInstance(t);
             t.GetProperty("AB").SetValue(theObj,"a",null);
             this.textBox1.Text = t.GetProperty("AB").GetValue(theObj, null).ToString();
         }
         //获取出静态的函数；
         private void static_()
         {
             a = System.Reflection.Assembly.LoadFrom("Class1.dll");
             Type t = a.GetType("Class1.Class1");
             t = Type.GetType("fanshetest1.Class1");
             //创建一个实例
             Object theObj = Activator.CreateInstance(t);
             //创建一个方法的实例
             MethodInfo mi = t.GetMethod("cc");
             Object returnValue = mi.Invoke(theObj, null);
             this.textBox1.Text = returnValue.ToString();
         }
         //获取出变量；
         private void variable()
         {
             a = Assembly.LoadFrom("Class1.dll");
             Type t = a.GetType("Class1.Class1");
             t = Type.GetType("fanshetest1.Class1");
             Object theObj = Activator.CreateInstance(t);
             MethodInfo mi = t.GetMethod("a");
             t.GetField("a").SetValue(theObj,"a");
             this.textBox1.Text = t.GetField("a").GetValue(theObj).ToString();
         }
         //获取出私有变量反射值；
         private void private_()
         { 

         }
         //构造函数
         private void gouzaohanshu()
         {
             Type t = a.GetType("Class1.Class1");
             t = Type.GetType("fanshetest1.Class1");
             //创建构造函数类型
             Type[] structure_Type = new Type[];
             structure_Type[] = Type.GetType("System.String");
             //定义构造函数传参类型
             Object[] structure_Obj = new Object[];
             structure_Obj[] = "aa";
             //创建一个 实例
             Object theObj = Activator.CreateInstance(t,structure_Obj);
             //MethodInfo structure_Mi = t.GetConstructor(structure_Type);
             //MethodInfo structure_Mi = t.GetMethod("Class1", structure_Type);
             //structure_Mi.Invoke(theObj, structure_Obj);
             MethodInfo mi = t.GetMethod("a");
             //t.GetField("a").SetValue(theObj, "a");
             this.textBox1.Text = t.GetField("a").GetValue(theObj).ToString();
         }
     }
 }