添加到界面前获取尺寸

原文: 添加到界面前获取尺寸 You have few options you can do this, forcing to call 

Window.Measure

 and 

Window.Arrange

 will make all values to be calculated, or you can get those values in the 

Window.Loaded

 event. This same issue is discussed already  on this question

.

If you are sizing to content:

window.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
window.Arrange(new Rect(0, 0, window.DesiredWidth, window.DesiredHeight));           

If you are using an explicit window size:

window.Measure(new Size(Width, Height));
window.Arrange(new Rect(0, 0, window.DesiredWidth, window.DesiredHeight));           

or

public MyWindow()
{
    Loaded += delegate
    {
        // access ActualWidth and ActualHeight here
    };

}



Just had the same issue and just calling          textblock.Measure(new Size());                 aint enough. I had to use         textblock.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));                 to get a result for          textblock.DesiredSize                

The key is to realize that setting it in code like this:

sp2.Margin = new System.Windows.Thickness{ Left = 5 };           

is equivalent to:

sp2.Margin = new System.Windows.Thickness{ Left = 5, Top = 0, Right = 0, Bottom = 0 };