.NET反射的简单示例

   1: (1)namespace ClassLibrarySport

   2: {

   3:     public abstract class Sport

   4:     {

   5:         protected string name;

   6:         public abstract string GetName();

   7:         public abstract string GetDuration();

   8:     }

   9: }

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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

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