Detailed introduction to common methods in C#

This article introduces the detailed description of methods in C#. Friends who need it can refer to it

1. Let the method return multiple parameters

1.1 Define variables outside the method to save the results

The code is as follows:

using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 namespace Method
 {
     class Program
     {
         public static int quotient;
         public static int remainder;
         public static void pide(int x, int y)
         {
             quotient = x / y;
             remainder = x % y;
         }
         static void Main(string[] args)
         {
             Program.pide(6,9);
             Console.WriteLine(Program.quotient);
             Console.WriteLine(Program.remainder);
             Console.ReadKey();
         }
     }
 }

1.2 Using output and input parameters

The code is as follows:

using System;using System.Collections.Generic;using System.Linq;using System.Text;
namespace Method{
    class Program
    {
       public static void pide(int x, int y, out int quotient, out int remainder) 
       {
            quotient = x / y;
            remainder = x % y;
        }
        static void Main(string[] args)
        {
            int quotient, remainder;
            pide(6,9,out quotient,out remainder);
            Console.WriteLine("{0} {1}",quotient,remainder);
            Console.ReadKey();
        }
    }
}

2. Method overloading

Method overloading is an important object-oriented expansion of structured programming features

The methods that constitute overloading have the following characteristics:

(1) The method names are the same

(2) The method parameter lists are different

There are three criteria for judging the second point above. If any one of the points is met, the method parameter lists can be determined to be different:

(1) The number of method parameters is different:

(2) The methods have the same number of parameters, but the types of parameters are different.

(3) Methods have the same number of parameters and parameter types, but the order in which the parameter types appear is different.

It should be noted that the method return value type is not the judgment of method overloading condition.

3. Hiding of methods

The code is as follows:

namespace 方法隐藏
 {
     class Program
     {
         static void Main(string[] args)
         {
             Parent p = new Child();
             p.show();
             Console.ReadKey();
         }
     }
     class Parent
     {
         public void show()
         {
             Console.Write("父类方法");
         }
     }
     class Child : Parent
     {
         public new void show()
         {
             Console.Write("子类方法");
         }
     }
 }

The code is as follows:

namespace 方法隐藏
{
    class Program
    {
        static void Main(string[] args)
        {
            Parent.show();
            Console.ReadKey();
            Child.show();//父类方法
        }
    }
    class Parent
    {
        public static void show()
        {
            Console.Write("父类方法");
        }
    }
    class Child : Parent
    {
        public static new void show()
        {
            Console.Write("子类方法");
        }
    }
}

On the premise that member storage permissions are not specified, all members are private.

The code is as follows:

namespace 方法隐藏 {
     class Program
     {
         static void Main(string[] args)
         {
             Parent p1= new Parent();
             Parent p2 = new Child();
             p1.show();//父类方法
             p2.show();//父类方法
             ((Child)p2).show();//父类方法
             Console.ReadKey();
         }
     }
     class Parent
     {
         public  void show()
         {
             Console.WriteLine("父类方法");
         }
     }
     class Child : Parent
     {
           new void show()
         {
             Console.WriteLine("子类方法");
         }
     }
 }

4. Method rewriting and virtual method calling

The code is as follows:

namespace 方法重写
 {
     class Program
     {
         static void Main(string[] args)
         {
             Parent p1 = new Parent();
             Parent p2 = new Child();
             p1.show();
             p2.show();
             ((Parent)p2).show();//子类方法
             Console.ReadKey();
         }
     }
     class Parent
     {
         public virtual void show()
         {
             Console.WriteLine("父类方法");
         }
     }
     class Child:Parent
     {
         public override void show()
         {
             Console.WriteLine("子类方法");
         }
     }
 }

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