AutoScrollPosition 设置到点位置后不报正确的值

问题描述

我有一个用户控件，它是可滚动控件，我想更改它的 AutoScrollPosition(仅 X 值).

I have a user control, which is scrollable control, and I want to change its AutoScrollPosition (only the X value).

我是这样做的:

int newScrollX = myFunction();
Point p = new Point(newScrollX, this.AutoScrollPosition.Y);
this.AutoScrollPosition = p;

newScrollX 得到正确的值，p 得到正确的点，但是在 AutoScrollPosition 设置的那一行之后，AutoScrollPosition 是 (0,0).

newScrollX gets the correct value, p gets the correct point, but after the line of AutoScrollPosition setting, the AutoScrollPosition is (0,0).

有什么问题?

谢谢

推荐答案

AutoScrollPosition 相当麻烦.

AutoScrollPosition is quite cumbersome.

通常这样做时您会得到负值:

usually you get negative values when doing this:

Point p = this.AutoScrollPosition;

但是在设置滚动位置时，您必须使用正值...因此要恢复完全相同的滚动位置，您必须反转负数:

but when setting the scroll position you have to use positive values... so to restore the exact same scroll position you have to invert the negative numbers:

this.AutoScrollPosition = new Point(-p.X, -p.Y)

否则，观察到的 AutoScrollPosition 将为 0,0.

Otherwise the AutoScrollPosition will be 0,0 as observed.

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