C# 异常处理案例

常规异常

using System;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[]args)
        {
            bool flag = true;
            do
            {
                try
                {
                    int a = Convert.ToInt32(Console.ReadLine());
                    int b = Convert.ToInt32(Console.ReadLine());
                    int c = a / b;
                    Console.WriteLine(c);
                    flag = false;
                }
                catch(DivideByZeroException d)
                {
                    Console.WriteLine(d.Message+"Try again");
                    flag = true;
                }
                catch(FormatException f)
                {
                    Console.WriteLine(f.Message+"Try again");
                    flag = true;
                }
            }
            while (flag );
        }
    }

}

自定义异常

using System;

namespace ConsoleApp1
{
    class AgeException:Exception
    {
        //3种构造函数
        public AgeException() : base("Age must over zero") { }
        public AgeException(string message) : base(message) { }
        public AgeException(string message,Exception e) : base(message, e) { }

        public int AgeValue { set; get; }

    }
    class Human
    {
        private int age;
        public int Age { get { return age; }
            set
            {
                if (value >= 0)
                {
                    age = value;
                }
                else
                {
                    var e = new AgeException();
                    e.AgeValue = value;
                    throw e;
                }
            }
        }
    }

    class Program
    {
        static void Main(string[]args)
        {
            Human h = new Human();
            try
            {
                h.Age = -1;
            }catch(AgeException E){
                Console.WriteLine(E.Message);
                Console.WriteLine("Age value={0}", h.Age);
            }
        }
    }

}