C# 進階（五）：繼承、派生類別建構子鏈結完整範例

派生類別建構子鏈結範例

public class UserBase {
    private string username;
    public UserBase() { Console.WriteLine("I'm good men"); }
    public UserBase(string username) { this.username = username; }
}

public class OneMen : UserBase {
    public OneMen() { Console.WriteLine("Yes, I'm very good!"); }
    public OneMen(string username) : base(username) { Console.WriteLine(username + " is a good men!"); }
    public OneMen(string username, string hisWebSite) : base(username) { Console.WriteLine(username + "'s webSite is " + hisWebSite); }
    public static void Main() {
        OneMen m1 = new OneMen();
        // OneMen m2 = new OneMen("pan");
        // OneMen m3 = new OneMen("pan", "www.gosoa.com.cn");
    }
}

執行結果

• new OneMen()：
  I'm good men
  Yes, I'm very good!
• new OneMen("pan")：
  pan is a good men!
• new OneMen("pan", "www.gosoa.com.cn")：
  pan's webSite is www.gosoa.com.cn

: base(...) 呼叫基底類別建構子，間接初始化基底私有欄位。派生類別建構子執行順序：基底類別建構子 → 派生類別建構子。