What is the copy constructor in C#

A constructor that creates an object by copying variables from another object or copying data from one object to another is called a copy constructor. Let’s take a brief look at it below, hoping it will be helpful to everyone.

#The copy constructor is a parameterized constructor that contains parameters of the same class type. Its main use is to initialize a new instance to the value of an existing instance. Normally, C# does not provide a copy constructor for objects, but if you want to create a copy constructor in your program, you can create it as needed. [Tutorial recommendation: C# video tutorial]

Basic syntax

The following is a copy constructor defined using the c# programming language Function syntax.

class Class_Name {
        // 参数化构造函数
        public Class_Name(string a, string b......)//参数列表
        {
            // code
        }
        // 复制构造函数
        public Class_Name(Class_Name instance_of_class)
        {
            // code
        }
}

Example:

using System;
namespace Tutlane{
    class User {
        public string name, location;
        // 参数化构造函数
        public User(string a, string b){
            name = a;
            location = b;
        }
        // 复制构造函数
        public User(User user) {
            name = user.name;
            location = user.location;
        }
    }
    class Program{
        static void Main(string[] args){
            // 带有参数化构造函数的User对象
            User user = new User("小明", "北京");
            // 另一个User对象（user1）通过复制user的详细信息，
            User user1 = new User(user);
            user1.name = "小华";
            user1.location = "上海";
            Console.WriteLine(user.name + ", " + user.location);
            Console.WriteLine(user1.name + ", " + user1.location);
        }
    }
}

Output:

Explanation:

In the above example, we create an instance of the copy constructor (user1) and use an instance of the user object as the parameter type. Therefore, the properties of the user object will be sent to the user1 object. When we change the property values ​​of the user1 object, these property values ​​will not affect the User object property values.

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