.NET反射的简单示例

(1)namespace ClassLibrarySport

{

public abstract class Sport

{

protected string name;

public abstract string GetName();

public abstract string GetDuration();

}

}

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(2)namespace ClassLibrarySomeSports//该项目添加了对(1)的引用

{

public class Football : ClassLibrarySport.Sport

{

public Football()

{

name = "Football";

}

public override string GetName()

{

return name;

}

public override string GetDuration()

{

return "four 15 minute quarters";

}

}

}

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(3)namespace ConsoleAssemblyTest//该项目添加了对(1)的引用

{

class Program

{

static void Main(string[] args)

{

Assembly assembly = Assembly.LoadFrom(@"E:\ClassLibrarySomeSports\

bin\Debug\ClassLibrarySomeSports.dll");

Type[] types = assembly.GetTypes();

 

Console.WriteLine("Get Type From ClassLibrarySomeSports.dll:");

for (int i = 0; i < types.Length; i )

{

Console.WriteLine(types[i].Name);

}

 

//使用GetConstructor()方法获取对应类型的构造器，从而构造出该类型的对象

Console.WriteLine("Use Method GetConstructor():");

ConstructorInfo ci = types[0].GetConstructor(new Type[0]);

ClassLibrarySport.Sport sport = (ClassLibrarySport.Sport)ci.Invoke(new object[0]);

Console.WriteLine(sport.GetName() " has " sport.GetDuration());

 

//使用Activator.CreateInstance()方法构造出该类型的对象

//使用assembly.CreateInstance()返回为null，？？

Console.WriteLine("Use Method CreateInstance():");

ClassLibrarySport.Sport sport1 = (ClassLibrarySport.Sport)

Activator.CreateInstance(types[0]);

Console.WriteLine(sport1.GetName() " has " sport1.GetDuration());

 

//反射指定类型中的名称为“GetDuration”的方法，通过Invoke()方法执行该方法

object objSport = Activator.CreateInstance(types[0]);

MethodInfo method = types[0].GetMethod("GetDuration");

object o = method.Invoke(objSport, new object[0]);

Console.WriteLine(o as string);

 

Console.Read();

}

}

}

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Output:

Get Type From ClassLibrarySomeSports.dll:

Football

Use Method GetConstructor():

Football has four 15 minute quarters

Use Method CreateInstance():

Football has four 15 minute quarters

four 15 minute quarters