[C# 筆記] : this 關鍵字

this關鍵字

1. 代表當前類別的對象
2. 在類別當中顯示的調用本類別的構造函數：this

：thiscall本身類別的其他的構造函式

public class Student
{
    //構造函式
    public Student(string name, int age, char gender, int english, int math)
    {
        this.Name = name;
        this.Age = age;
        this.Gender = gender;
        this.English = english;
        this.Math = math;
    }

    public Student(string name, int english, int math) 
    : this(name, 18, 'C', english, math)
    {
        // : this(name, 18, 'C', english, math)會調用的是有全部屬性的參數
        //這邊↓↓↓就算沒沒寫也可以運行
        //this.Name = name;
        //this.English = english;
        //this.Math = math;
    }
    public Student(string name, int age, char gender)
    {
        this.Name = name;
        this.Age = age;
        this.Gender = gender;
    }
}

---

範例：:this&:base

• :this 調用自己的構造函數
• :base 調用父類的構造函數

/// <summary>
/// 商品的父類
/// </summary>
internal class ProductFather
{
    public string ID { get; set; } //Guid.NewGuid()
    public string Name { get; set; }
    public decimal Price { get; set; }
    public int Count { get; set; }

    public ProductFather(string id, string name, decimal price, int count)
    {
        this.ID = id;
        this.Name = name;
        this.Price = price;
        this.Count = count;
    }

    public ProductFather(string id, string name, decimal price)
        : this(id, name, price, count: 0) //:this調用自己的構造函數
    {
    }
}
/// <summary>
/// Acer筆電 子類
/// </summary>
internal class Acer : ProductFather {
    public Acer(string id, string name, decimal price)
        : base(id, name, price) //:base調用父類的構造函數
    {
    }
}