反射主要用于在程序运行期间动态解析相关类的类名，命名空间，属性，方法并进行相应操作，以下通过两个简单的例子进行了说明：
示例1：调用程序集内部方法，运行时动态获取相关类的信息，包括类名，命名空间等信息并进行对象的创建及方法的调用：
测试类：
class HI
{
public string Hi = "HelloWorld"; public string SayHello_CI()
{
return "Hello World!";
} public string SayHello_AC()
{
return "How are you!";
}
}
调用类：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Runtime.Remoting;
using System.Text;
using System.Threading.Tasks; namespace ReflectionLearning01
{
class Program
{
static void Main(string[] args)
{
Type type = typeof(HI); //Create object using Assembly
Assembly Assem = type.Assembly;
Object objAssembly = Assem.CreateInstance("ReflectionLearning01.HI", true); //Creare object using Activator
ObjectHandle handler = Activator.CreateInstance(null, "ReflectionLearning01.HI");
Object objActvator = handler.Unwrap(); //Call the function in another class
string res_ci = (string)type.InvokeMember("SayHello_CI", BindingFlags.InvokeMethod, null, objAssembly, null);
string res_ac = (string)type.InvokeMember("SayHello_AC", BindingFlags.InvokeMethod, null, objActvator, null); string Name = type.Name;
string FullName = type.FullName;
string NameSpace = type.Namespace;
var Assembly = type.Assembly;
var Module = type.Module; Console.WriteLine("ClassName:" + Name);
Console.WriteLine("ClassFullName:" + FullName);
Console.WriteLine("NameSpace:" + NameSpace);
Console.WriteLine("Assembly:" + Assembly);
Console.WriteLine("Module:" + Module); Console.WriteLine(res_ci);
Console.WriteLine(res_ac);
Console.ReadLine(); }
}
}
运行结果：
示例2：在当前程序集内部调用外部程序集即动态加载DLL，调用其中的方法并返回方法返回值：
新建类库项目HelloWorld，新增类的详细代码如下，生成.dll:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks; namespace HelloWorld
{
public class HI
{
public string SayHello(string Hi)
{
return Hi+", current time is "+DateTime.Now.ToShortDateString()+",It's time to go home!";
}
}
}
新建类Windows 控制台程序ReflectionLearning，类的调用信息如下：
PS.不需要添加HelloWorld.dll到当前项目的引用中
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Runtime.Remoting;
using System.Text;
using System.Threading.Tasks; namespace ReflectionLearning01
{
class Program
{
static void Main(string[] args)
{
Assembly assembly = System.Reflection.Assembly.LoadFile(AppDomain.CurrentDomain.BaseDirectory + "HelloWorld.dll");
Type type = assembly.GetType("HelloWorld.HI");
object instance = assembly.CreateInstance("HelloWorld.HI"); //Parameter list
Type[] ParmType = new Type[];
ParmType[] = Type.GetType("System.String");
Object[] parm_obj = new Object[];
parm_obj[] = "HelloWorld!"; object result = type.GetMethod("SayHello", ParmType).Invoke(instance, parm_obj); Console.WriteLine(result);
Console.ReadLine(); }
}
}
拷贝HelloWorld.dll到当前项目，并F5运行，调用成功后的信息如下所示：
到此，两个演示的例子已经完成,希望通过不断的使用,我们都能不断提高!