以全屏應用程序爲中心的模式WPF窗口

Question

我試圖創建一個始終顯示在屏幕中心的模式確認對話框。

我試着使用：

ConfirmCreate confirmCreate = new ConfirmCreate(); // ConfirmCreate extends Window. 
bool? dialogResult = confirmCreate.ShowDialog(); 
confirmCreate.Owner = this; 
confirmCreate.WindowStartupLocation = WindowStartupLocation.CenterOwner; 

......還有......

ConfirmCreate confirmCreate = new ConfirmCreate(); 
bool? dialogResult = confirmCreate.ShowDialog(); 
confirmCreate.WindowStartupLocation = WindowStartupLocation.CenterScreen; 

......甚至......

ConfirmCreate confirmCreate = new ConfirmCreate(); // ConfirmCreate is a subclass of Window. 
bool? dialogResult = confirmCreate.ShowDialog(); 
confirmCreate.WindowStartupLocation = WindowStartupLocation.Manual; 
confirmCreate.Left = Width/2 - confirmCreate.Width/2; 
confirmCreate.Top = Height/2 - confirmCreate.Height/2; 

無濟於事，有人可以解釋爲什麼這不起作用嗎？

Answer 1

在最後嘗試所有選項confirmCreate.ShowDialog();。換句話說，設置爲WindowStartupLocation的設置，然後撥打電話ShowDialog()

Answer 2

那麼，看了代碼後，我意識到我有點愚蠢。

如果我在使用ShowDialog()方法之前設置了屬性，則CentreScreen和CentreOwner屬性將正常工作。

ConfirmCreate confirmCreate = new ConfirmCreate(); // ConfirmCreate extends Window. 
confirmCreate.Owner = this; 
confirmCreate.WindowStartupLocation = WindowStartupLocation.CenterOwner; 
bool? dialogResult = confirmCreate.ShowDialog(); 

和...

ConfirmCreate confirmCreate = new ConfirmCreate(); 
confirmCreate.WindowStartupLocation = WindowStartupLocation.CenterScreen; 
bool? dialogResult = confirmCreate.ShowDialog();