C#视频

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;

namespace ConsoleApplication1
{
       
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                int a = 5;
                Console.WriteLine(int.MaxValue);

                long b = 52326523222;
                Console.WriteLine(long.MaxValue);

                //a = checked((int)b);

                checked
                {
                    a = (int)b;
                }

                Console.WriteLine(a);
            }
            catch(OverflowException e)
            {
                Console.WriteLine(e.ToString());
                Console.ReadLine();
                return;
            }

            Console.ReadLine();
        }
    }
}

 以上是值类型的转换。

Type t = f.GetType();      // t的类型为Apple

is 和 as 操作符： is操作符返回true；as强制类型转换；