2020-12-13

Error handling

using System;

namespace 错误处理
{
    
    
    class Program
    {
    
    
        static void Main(string[] args)
        {
    
    
            try
            {
    
    
                int[] myArray = {
    
     1, 2, 3, 4 };
                int MyEle = myArray[4];
            }
            catch(IndexOutOfRangeException e)//IndexOutOfRangeException为检测的类型，如果没有括号则说明检测类型为所有类型
            {
    
    
                Console.WriteLine("发生了异常：IndexOutOfRangeException");
                Console.WriteLine("您在访问数组的时候下标越界了");
            }
            Console.WriteLine();
            Console.ReadKey();
        }
    }
}

Anonymous type

using System;

namespace 匿名类型
{
    
    
    class Program
    {
    
    
        static void Main(string[] args)
        {
    
    
            int a = 32;
            string str = "hahaha";
            double b = 1.23;
            var i = 32;
            var j = "heihei";
            var n = 1.24;
            //var可以是任意类型，但当var被赋值之后，该var它的类型就确定了，并且不可修改
            //var i = "asd";此时就会报错，因为i为整数型，该var也就相当于int
            Console.WriteLine(a);
            Console.WriteLine(str);
            Console.WriteLine(b);
            Console.WriteLine(i);
            Console.WriteLine(j);
            Console.WriteLine(n);
        }
    }
}

Properties
(if you need to set read-only or write-only permissions, you only need to change the access modifier before get set)

using System;

namespace 属性
{
    
    
    class Program
    {
    
    
        private string name;
        private int age;

        //若需要设置只读或只写的权限，只需要改变get set前的访问修饰符即可
        public string Name
        {
    
    
            get
            {
    
    
                return name;
            }
            set
            {
    
    
                name = value;
            }
        }
        public int Age
        {
    
    
            get
            {
    
    
                return age;

            }
            set
            {
    
    
                age = value;

            }
        }

    }
    class Exanole
    {
    
    
        static void Main(string[] args)
        {
    
    
                Program student1 = new Program();
                student1.Name  = "ken";
                student1.Age = 18;
                Console.WriteLine("student1的姓名为" + student1.Name );
                Console.WriteLine("student1的年龄为"+student1.Age);
        }
    }
}