问题
I have a WPF DataTemplate with two TextBlock controls (stacked) and then some other elements underneath. Due to some complicated layout code, I need to know the height of the two TextBlock elements so that I can draw some fancy connector lines, and line up other controls, etc.
If I know the text that's going into the TextBlocks, and I know the font, etc., is there some way I can compute or measure the height of these TextBlocks without actually rendering them?
回答1:
I think it should be sufficient to call the UIElement.Measure(Size) method and subsequently check the UIElement.DesiredSize property. For more information, check the provided MSDN links.
回答2:
The call to UIElement.Measure(Size)
, takes as a parameter Size
. The second call UIElement.DesiredSize
returns whatever Size
you passed into the Measure
method.
I think this is the case because UIElement
(TextBlock
in this case) is NOT a child of any control (yet) and therefore DesiredSize
has no reason to be anything different.
回答3:
I appreciate that this is a rather old question, but I have found that using the following code
TextBlock textBlock = new TextBlock();
textBlock.Text = "NR valve";
Size msrSize = new Size(100, 200);
textBlock.Measure(msrSize);
Size dsrdSize = textBlock.DesiredSize;
dsrdSize is returned as {47.05,15.96}. The trick seems to be making the msrSize larger than the expected actual size. msrSize seems to act as a limit for the DesiredSize() result. For example, using msrSize = new Size(10, 10), results in a dsrdSize of {10,10} here. Hope this helps someone.
回答4:
public static Size ShapeMeasure(TextBlock tb) {
// Measured Size is bounded to be less than maxSize
Size maxSize = new Size(
double.PositiveInfinity,
double.PositiveInfinity);
tb.Measure(maxSize);
return tb.DesiredSize;
}
public static Testit()
{
TextBlock textBlock = new TextBlock();
textBlock.Text = "NR valve";
Size text size = ShapeMeasure(textBlock);
}
来源:https://stackoverflow.com/questions/2988622/how-do-i-measure-the-size-of-a-textblock-in-wpf-before-it-is-rendered