不透明度不適用於WPF Popup控件

Question

Popup popUpControl = new Popup(); 

popUpControl.PlacementTarget = this; 
popUpControl.StaysOpen = true; 
popUpControl.Child = new MyUserControl(); /// my user control 
popUpControl.Opacity = 0.5; // this code has no effect in the appearance of the popup 
popUpControl.IsOpen = true; 

如何做到這一點？

Answer 1

您需要設置彈出內容的不透明度。
因此，對於您的按鈕具有

popUp.Child = new Button() 
{ 
    Width = 300, 
    Height = 50, 
    Background = Brushes.Gray, 
    Opacity = 0.5 // set opacity here 
}; 

Answer 2

您應該啓用Popup具有透明度。添加下面的代碼行。

popUpControl.AllowsTransparency=true;