Set width and height of image in bitmap.
成立于位图图像的宽度和高度。
In the first section of this function, you set up objects needed to create the report, like the width and height of the canvas, as well as padding variables.
在这个函数的第一部分中，您设置了创建报告需要的对象，比如画布的宽度和高度以及填充变量。
One thing you might have noticed in the XAML above is that our top-level control is currently set to be a fixed width and height
你也许注意到了，在上面的 XAML 中我们的顶层控件设置成了固定的高度和宽度
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