this()无参构造函数的小技巧

在开发中，类中的this()是对应无参构造函数。所以在调用有参构造函数的时候，想加载默认的无参构造函数可在方法体后面添加：this()。

public partial class MessageWindow : Window
    {

        public MessageWindow()
        {
            InitializeComponent();
            this.Loaded += IssueMessageWindow_Loaded;
        }

        private void IssueMessageWindow_Loaded(object sender, RoutedEventArgs e)
        {
            //实现默认代码
        }

        public MessageWindow(EasyButton easy, string msgInfo) 
        {
            InitializeComponent();
            this.Loaded += IssueMessageWindow_Loaded;
            //实现逻辑
        }

        public MessageWindow(EasyButton easy, string msgInfo, int timeout)
        {
            InitializeComponent();
            this.Loaded += IssueMessageWindow_Loaded;
            //实现逻辑
        }

        public MessageWindow(string msgInfo, int timeout)
        {
            InitializeComponent();
            this.Loaded += IssueMessageWindow_Loaded;
            //实现逻辑
        }

  }

更改为：