C # using the This keyword to implement a concatenation constructor call method

The example in this article describes C # using the This keyword to implement a concatenation constructor call method. Share to everyone for your reference. The specific analysis is as follows:

In a class, if you need to implement multiple custom constructors, it is common practice to implement their own business logic in the constructor, if the implementation of these business logic is not entirely different, obviously does not conform to OOP programming ideas, is very detrimental to maintenance, of course, we can also by the same logical part of the package into a method, But there is a more reasonable and simple way to do this by implementing a concatenation constructor using the This keyword as a simple example.

The sample code is as follows:

The code is as follows:

public class Person

{

public string personname;

Defines an age as a nullable type so that it can be given a null value

public int? personage;

The first three constructors below call the fourth constructor with the most parameters, and take only the partial arguments they need

This is the this concatenation constructor

Public person (): This ("", 0)

{

}

Public person (string name): This ("Evan", NULL)

{

}

Public person (INT.): This ("", 20)

{

}

Public person (string name, Int. age)

{

This.personname = name;

Pass?? Determines whether the passed-in age is a null value

If it is a null value, it is assigned a value of 100

This.personage = age?? 100;

}

public void Display ()

{

Console.WriteLine ("Name:{0},age:{1}\n", PersonName, personage);

}

}

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C # using the This keyword to implement a concatenation constructor call method

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C # using the This keyword to implement a concatenation constructor call method