C# 反射实例
先讨论一个最简单的例子,首先编写类库如下:
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
然后进行应用程序的编写
1.指定类库文件必须使用绝对路径,不能使用相对路径(其实感觉有点不合理,不太方便)
2.19行,命名空间和类的名字必须一起指定
3.在例子1种必须实例化反射要反射的类,因为要使用的方法并不是静态方法。
4.由于这个方法有两个参数,可以用这种Object的方法指定参数也可以直接写method.Invoke(obj, new Object[] { "test", 1 });
5.在例子2种我们想用的方法是一个静态方法,这时候Invoke的时候,对于第一个参数是无视的,也就是我们写什么都不会被调用,即使我们随便new了一个any这样的Object,当然这种写法是不推荐的。但是对应在例子1种我们如果Invoke的时候用了类型不一致的实例来做为参数的话,将会导致一个运行时的错误。
6.第三个例子是一个调用无参数静态方法的例子,这时候两个参数我们都不需要指定,用null就可以了。
output:
WriteString:test1
StaticWriteString:test
StaticWriteString:test
StaticWriteString:test
NoParaWriteString
再说一个问题,如果调用的类是静态类的时候,需要注意一个问题,肯定我们会想到一个问题,静态类是不能实例化的,这时候,31行的类的实例化的方法我们就不需要了,直接使用Invoke就可以实现,否则将会出现运行时的错误,同样的道理,第一个参数将会被无视,只要我们传对了参数就可以了。
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using System;
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namespace ReflectionTest
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{
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public class WriteTest
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{
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//public method with parametors
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public void WriteString(string s, int i)
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{
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Console.WriteLine("WriteString:" + s + i.ToString());
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}
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//static method with only one parametor
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public static void StaticWriteString(string s)
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{
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Console.WriteLine("StaticWriteString:" + s);
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}
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//static method with no parametor
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public static void NoneParaWriteString()
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{
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Console.WriteLine("NoParaWriteString");
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}
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}
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}
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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
然后进行应用程序的编写
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using System;
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using System.Reflection;
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class TestApp
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{
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public static void Main()
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{
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Assembly ass;
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Type type;
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Object obj;
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//Used to test the static method
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Object any = new Object();
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//Load the dll
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//Must indicates the whole path of dll
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ass = Assembly.LoadFile(@"D:\Source Code\00.C# Sudy\01.Reflection\01\ReflectTest.dll");
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//Must be Namespace with class name
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type = ass.GetType("ReflectionTest.WriteTest");
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/*example1------------------------------------------------------------------------------------*/
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MethodInfo method = type.GetMethod("WriteString");
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string test = "test";
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int i = 1;
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Object[] parametors = new Object[]{test,i};
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//Since the WriteTest Class is not Static you should Create the instance of this class
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obj = ass.CreateInstance("ReflectionTest.WriteTest");
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method.Invoke(
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obj, //Instance object of the class need to be reflect
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parametors); //Parametors of indicated method
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//method.Invoke(any, parametors);//RuntimeError: class reference is wrong
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/*example2------------------------------------------------------------------------------------*/
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method = type.GetMethod("StaticWriteString");
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//The first parametor will be ignored
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method.Invoke(null, new string[] { "test"});
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method.Invoke(obj, new string[] { "test"});//indicates the instance will equals above line
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method.Invoke(any, new string[] { "test"});//Even the class reference is wrong
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/*example3------------------------------------------------------------------------------------*/
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method = type.GetMethod("NoneParaWriteString");
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//Sine the method NoneParaWriteString() has no parametors so do not indicate any parametors
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method.Invoke(null, null);
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}
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}
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1.指定类库文件必须使用绝对路径,不能使用相对路径(其实感觉有点不合理,不太方便)
2.19行,命名空间和类的名字必须一起指定
3.在例子1种必须实例化反射要反射的类,因为要使用的方法并不是静态方法。
4.由于这个方法有两个参数,可以用这种Object的方法指定参数也可以直接写method.Invoke(obj, new Object[] { "test", 1 });
5.在例子2种我们想用的方法是一个静态方法,这时候Invoke的时候,对于第一个参数是无视的,也就是我们写什么都不会被调用,即使我们随便new了一个any这样的Object,当然这种写法是不推荐的。但是对应在例子1种我们如果Invoke的时候用了类型不一致的实例来做为参数的话,将会导致一个运行时的错误。
6.第三个例子是一个调用无参数静态方法的例子,这时候两个参数我们都不需要指定,用null就可以了。
output:
WriteString:test1
StaticWriteString:test
StaticWriteString:test
StaticWriteString:test
NoParaWriteString
再说一个问题,如果调用的类是静态类的时候,需要注意一个问题,肯定我们会想到一个问题,静态类是不能实例化的,这时候,31行的类的实例化的方法我们就不需要了,直接使用Invoke就可以实现,否则将会出现运行时的错误,同样的道理,第一个参数将会被无视,只要我们传对了参数就可以了。
posted on 2007-05-23 15:33 Big Angel 阅读(2530) 评论(1) 编辑 收藏 举报