C#反射概念以及实例详解

C#反射概念以及实例详解2011-05-29C#反射的入门学习首先要明白C#反射提供了封装程序集、模块和类型的对象等等。那么这样可以使用反射动态创建类型的实例，将类型绑定到现有对象，或从现有对象获取类型并调用其方法或访问其字段和属性。如果代码中使用了属性，可以利用反射对它们进行访问。

一个最简单的C#反射实例，首先编写类库如下：

using System;

namespace ReflectionTest
{
public class WriteTest
{
//public method with parametors
public void WriteString（string s, int i）
{
Console.WriteLine（"WriteString:" + s + i.ToString（））;
}

//static method with only one parametor
public static void StaticWriteString（string s）
{
Console.WriteLine（"StaticWriteString:" + s）;
}

//static method with no parametor
public static void NoneParaWriteString（）
{
Console.WriteLine（"NoParaWriteString"）;
}
}
}

使用命令行编译csc /t：library ReflectTest.cs命令进行编译，生成ReflectTest.dll库文件。

然后进行下列程序的编写：

using System;
using System.Reflection;

class TestApp
{
public static void Main（）
{
Assembly ass;
Type type;
Object obj;

//Used to test the static method
Object any = new Object（）;

//Load the dll
//Must indicates the whole path of dll
ass = Assembly.LoadFile（@"D:Source Code0.C#
Sudy1.Reflection1ReflectTest.dll"）;
//Must be Namespace with class name
type = ass.GetType（"ReflectionTest.WriteTest"）;

/**//*example1---------*/

MethodInfo method = type.GetMethod（"WriteString"）;

string test = "test";
int i = 1;

Object[] parametors = new Object[]{test,i};

//Since the WriteTest Class is not Static you should Create the instance of this class
obj = ass.CreateInstance（"ReflectionTest.WriteTest"）;

method.Invoke（
obj,//Instance object of the class need to be reflect
parametors）;//Parametors of indicated method

//method.Invoke（any, parametors）;//RuntimeError: class reference is wrong

/**//*example2----------*/

method = type.GetMethod（"StaticWriteString"）;

//The first parametor will be ignored
method.Invoke（null, new string[] { "test"}）;
method.Invoke（obj, new string[] { "test"}）;//indicates the instance will equals above line
method.Invoke（any, new string[] { "test"}）;//Even the class reference is wrong

/**//*example3-----------*/

method = type.GetMethod（"NoneParaWriteString"）;

//Sine the method NoneParaWriteString（）

has no parametors so do not indicate any parametors
method.Invoke（null, null）;

}
}