WPF用ShowDialog()弹出窗体时控制该窗体的显示位置,并传值回父窗体

private void Button_Click(object sender, RoutedEventArgs e)
        {
            Window2 w2 = new Window2(this.Top, this.Left);//this.Top,this.Left 作用是将当前父窗体的位置传给子窗体
           
            if (w2.ShowDialog()==true)
            {
                text1.Text = w2.name;
            }
        }
    }

  public string name;
        public Window2(double x,double y)
        {
            InitializeComponent();
            //启用‘Manual’属性后，可以手动设置窗体的显示位置
            this.WindowStartupLocation = WindowStartupLocation.Manual;
            this.Top = x;
            this.Left = y;
            
        }

        private void but1_Click(object sender, RoutedEventArgs e)
        {
            name = "hlr";
            this.DialogResult = true;
        }