04. Constructors

Ctrl+r+e generates properties based on fields.
Construction method: (1). The construction method is used to create the object, and the object can be initialized in the constructor method. (2). The constructor method is the special method used to create the object, the method name of the constructor method is the same as the class name, but the constructor method does not return a value, and even void does not write.  (3). The construction method can be privatized. Use private to modify the construction method (there is a problem!) (4). When creating a class, you should create a constructor method, and if you do not create a constructor method, the system defaults to athe method of constructing without parameters.(5). If a constructor method is specified, no longer has a default parameterless constructor, if a parameterless constructor is required .we must override the constructor.(6). This means that constructors can be overloaded.(7). The constructor is executed when instantiating the object.

Use the construction method to solve:

1) Repeat the name of the written object when assigning the initial value

2) If we have a property, the user is not allowed to change. We generally define this property as a read-only Type property.

Then the property of this read-only type cannot be assigned to him after instantiation, so how do we initialize it? We

It can be initialized by the constructor.

we define a class, and if there is no write constructor, then the compiler will automatically add to us in this class A a method of constructing a parameter.

Once we have written a construction method, the compiler will no longer add this to the no-parameter constructor method.

The benefit of the construction method: When instantiating an object, it is possible to assign values to the attributes in the class to which the object is instantiated, avoiding the redundancy of the code.
Keyword NEW: example: Perosn zsperson=new person (); new helps us do a few things? New helps us do three things: (1). Open up space in memory. (2). Create an object in the open space. (3). Call the object's constructor to initialize the object.
This keyword this is useful for: (1). An object that represents the current class. (2). Call the constructor of this class in the class

  
 

   
  

  
 /// <summary>
   
  

  
 /// 定义了有三个参数的构造函数
   
  

  
 /// </summary>
   
  

  
 /// <param name="name">姓名</param>
   
  

  
 /// <param name="age">年龄</param>
   
  

  
  ///<param name= "gender" & gt; gender </param>   
   
  

  
  public    student   ( string   name   int   Age   char   gender   this   ( name   age    Gender   0   0   0  )    Span class= "com" >//called the full parameter constructor   
   
  

  
 {
   
  

  
 //this.Name = name;
   
  

  
 //this.Age = age; //这里就可以省略冗余代码了
   
  

  
 //this.Gender = gender;
   
  

  
 }
   
  

  

   
  

  
 /// <summary>
   
  

  
 /// 定义了一个有六个参数的构造函数
   
  

  
 /// </summary>
   
  

  
 /// <param name="name">姓名</param>
   
  

  
 /// <param name="age">年龄</param>
   
  

  
 /// <param name="gender">性别</param>
   
  

  
 /// <param name="chinese">语文成绩</param>
   
  

  
 /// <param name="math">数学成绩</param>
   
  

  
 /// <param name="english">英语成绩</param>
   
  

  
 public Student(string name, int age, char gender, double chinese, double math, double english) 
   
  

  

   
  

  
 {
   
  

  
 this.Name = name;
   
  

  
 this.Age = age;
   
  

  
 this.Gender = gender;
   
  

  
 this.Chinese = chinese;
   
  

  
 this.Math = math;
   
  

  
 this.English = english;
   
  

  

   
  

  
 }
  
 

From for notes (Wiz)

04. Constructors