WPF中的Window.ShowDialog()開啟的視窗中的按鈕Close()事件

我經常會使用ShowDialog().Value；這個遇到實現下面的功能時，ShowDialog()出的窗體Close()時，並不能返回值。
錯誤程式碼如下：

 0 AddDataWay addDataWay = new AddDataWay();
 1 if (addDataWay.ShowDialog().Value)  // 
 2             {
 3                 int selectedWay = addDataWay.SelectWay();
 4                 if
 
 (selectedWay == 1)
 5                 {
 6                 }
 7                 else
 8                 {
 9                 }
10             }

跟改為：

 0 AddDataWay addDataWay = new AddDataWay();
 1 if (addDataWay.ShowDialog().HasValue)  // 
 2             {
 3                 int selectedWay = addDataWay.SelectWay();
 
 4                 if (selectedWay == 1)
 5                 {
 6                 }
 7                 else
 8                 {
 9                 }
10             }

AddDataWay視窗程式碼：

 1 public partial class AddDataWay : DXWindow
 2     {
 3         #region 成員變數
 4         public static int selectedWay=1
 
;  // 選擇方式預設雲端
 5         #endregion
 6 
 7         public AddDataWay()
 8         {
 9             this.InitializeComponent();
10         }
11 
12         private void DXWindow_Loaded(object sender, RoutedEventArgs e)
13         {
14         }
15 
16         /// <summary>
17         /// 雲端-0
18         /// </summary>
19         /// <param name="sender"></param>
20         /// <param name="e"></param>
21         private void ImportFromTheCloud_Click(object sender, RoutedEventArgs e)
22         {
23             selectedWay = 0;
24             this.Close();
25         }
26 
27         /// <summary>
28         /// 本地-1
29         /// </summary>
30         /// <param name="sender"></param>
31         /// <param name="e"></param>
32         private void ImportFromTheLocal_Click(object sender, RoutedEventArgs e)
33         {
34             selectedWay = 1;
35             this.Close();
36         }
37     }