设置为自动时如何获取控制器的高度/宽度 [英] How to get Height/Width of a controller when it is set to be Auto

问题描述

大家好，
我在网格中有一个画布"，画布的高度"和宽度"设置为自动".
在后面的代码中，我需要在此Canvas中绘制一个形状(即Line，Rectangle)，并将形状的大小设置为Canvas的大小(即，Rectangle与画布的高度相同，宽度为画布的一半).画布宽度)
我使用了以下内容:

Hey guys,
I have a Canvas inside a grid, the Height and Width of the canvas is set to be Auto.
In my code behind, I need to draw a shape (i.e. Line, Rectangle) inside this Canvas and set the size of the shape to the size of Canvas (i.e. a Rectangle which has a Height same as the canvas and a width half of the canvas width)
I used the following :

double H = A_Canvas.Height;
double H = A_Canvas.ActualHeight;

对于第一个，我得到NaN，对于第二个，我得到0.

For the first one, I get NaN and for the second one I get 0.

How should I do this ?!

推荐答案

这取决于您尝试查找画布高度的位置.
您可以在包含的视图中覆盖OnRenderSizeChanged.此时，已经为画布指定了大小和ActualHeight，然后可以正常工作.

It depends on where you are trying to find out your canvas height.
You could override the OnRenderSizeChanged in the containing view. At this point the canvas has been given a size and ActualHeight with then work correctly.

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