Get width of element of auto width

问题

I am trying to get the Width of a StackPanel. I tried:

double width = stk_main.ActualWidth;

which gave zero and it shouldnt be. Also:

double width = stk_main.Width;

which gives NaN because width set to auto previously. So how can I get the width?

回答1:

You can use sizeChanged, but it doesn't work when the stack panel you used not change size.

private void stk_main_SizeChanged(object sender, SizeChangedEventArgs e)
{
    double yourWidthNow = e.NewSize.Width;
}

Hope it can give you some help...

回答2:

You could attach to the Loaded event of the StackPanel as the layout pass will have completed by this point and the ActualWidth will be set.

来源：https://stackoverflow.com/questions/9795986/get-width-of-element-of-auto-width