C# Learning Diary 14---Reference type object class

Let us first understand what the object class is

Object class:

The object class is the base class of all types, and all types are derived from it. All types in C# Classes are directly or indirectly inherited from the Sytem.Object class (it may be a little confusing, it doesn't matter, for example, if the Object class is a tree trunk, all the classes we learned earlier are branches or leaves, you understand). Therefore, any type of value can be assigned to a variable of type Object.

Determine an Object variable:

To declare a variable of type Object, use the object keyword; this keyword is defined in the predefined namespace System provided by the .Net framework structure. , is an alias of class System.object. The definition format is as follows: object variable name;

Example:

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
  
namespace Test  
{    
    class Program  
    {  
         static void Main(string[] args)  
        {  
            object Int,Str,Doub,Ch;    //定义4个object变量  
            Int = 1;                   //整形赋值成功    
            Str = "HC666";             //string类型赋值成功  
            Doub = 12.32;             //double 类型赋值成功  
            Ch = '男';               //char 类型赋值成功  
            Console.WriteLine("Int = {0}\tStr = {1}\tDoub = {2}\tch = {3}",Int,Str,Doub,Ch);   
              
        }  
    }  
}

Output result: (exactly the same^_^)

Example Exploration:

The above definition of Object emphasizes that object is the base class for all types. So can we define a Struct class and a class class and convert them into objects? ? I added some elements to the above code:

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Text;  
  
namespace Test  
{    
    class Program  
    {  
        public struct Student  
        {  
           public string name;  
           public char sex;  
           public uint age;  
        }  
        static void Main(string[] args)  
        {  
           Student stu = new Student{ name = "HC666",sex = '男',age = 19 };  //初始化 stu   
  
           object m = stu;                 //将stu转换为object类型的对象m  
  
           Student x = (Student)m;         //将object类型的对象m 转换为Student x 要用强制转换  
            
            Console.WriteLine("name:{0}\tsex:{1}\tage:{2}",x.name,x.sex,x.age);  
                          
        }  
    }  
}

<span style="font-size:18px;">结果是这样的：</span>

The above example shows that the Struct type and Class type can be converted into each other with the object type. The conversion process is as follows:

Struct ---->object---->struct; (only Struct---->Object cannot output values), the value in stu will not be changed during the conversion process

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