C#Type类中的IsAssignableFrom、IsInstanceOfType、IsSubclassOf

先写两个有继承关系的类Person、Son和一个接口IProgram:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace TestType
{
    interface IProgram
    {
        void Program ();
    }
}

　　

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace TestType
{
    public class Person : IProgram
    {
        public string Name;
        public int age;
 
        public void Say ()
        {
            Console.WriteLine("Person Say");
        }
 
        public void Program()
        {
            Console.WriteLine("Person Program");
        }
    }
}

　　

一.测试IsAssignableFrom.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace TestType
{
    class Program
    {
        static void Main(string[] args)
        {
            Type personTp = typeof(Person);
            Type sonTp = typeof(Son);
            Type programTp = typeof(IProgram);
 
            Console.WriteLine(personTp.IsAssignableFrom(sonTp));
            Console.WriteLine(programTp.IsAssignableFrom (personTp));
            Console.WriteLine(programTp.IsAssignableFrom(sonTp));
            Console.WriteLine(programTp.IsAssignableFrom(programTp));
        }
    }
}

结果:

总结:

IsAssignableFrom判断参数类:

1.是否为当前类或接口.

2.是否继承当前类.

3.是否实现当前接口.

----------------------------------------------------------------------------------------------------------------

二.测试IsInstanceOfType.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace TestType
{
    class Program
    {
        static void Main(string[] args)
        {
            Type personTp = typeof(Person);
            Type sonTp = typeof(Son);
            Type programTp = typeof(IProgram);
 
            Person person = new Person();
            Son son = new Son();
 
            Console.WriteLine(personTp.IsInstanceOfType(person));
            Console.WriteLine(personTp.IsInstanceOfType(son));
 
            Console.WriteLine(sonTp.IsInstanceOfType(person));
            Console.WriteLine(sonTp.IsInstanceOfType(son));
 
            Console.WriteLine(programTp.IsInstanceOfType(person));
            Console.WriteLine(programTp.IsInstanceOfType(son));
        }
    }
}

结果:

总结:

IsInstanceOfType判断参数对象:

1.是否为当前类的实例.

2.是否实现了当前接口.

--------------------------------------------------------------------------------------------------------------------------------

三.测试IsSubclassOf.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace TestType
{
    class Program
    {
        static void Main(string[] args)
        {
            Type personTp = typeof(Person);
            Type sonTp = typeof(Son);
            Type programTp = typeof(IProgram);
 
            Person person = new Person();
            Son son = new Son();
 
            Console.WriteLine(sonTp.IsSubclassOf(personTp));
            Console.WriteLine(sonTp.IsSubclassOf(sonTp));
            Console.WriteLine(sonTp.IsSubclassOf(programTp));
        }
    }
}

结果:

总结:

IsSubclassOf判断参数类型:

1.是否为当前类的父类.

2.不能判断接口.