c# - 不透明度不应用于WPF弹出控件

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;

怎么做？

最佳答案

您需要在弹出内容上设置不透明度。
所以对于你的按钮有

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