C＃/ WPF - 获取的ScrollViewer滚动位置？ [英] C#/WPF - Get ScrollViewer scroll position?

问题描述

好了，所以，每个人都知道如何设置的ScrollViewer的滚动位置。整个文章和博客文章已经有许多关于 ScrollViewer.ScrollToVerticalOffset（），有大约在这里答案的好几百个问题。

Okay, so, everyone knows how to set the scroll position of a ScrollViewer. Entire essays and blog entries have been written about ScrollViewer.ScrollToVerticalOffset(), and there are a good few hundred questions with answers about it here.

所以，我请输入：

myScrollViewer.ScrollToVerticalOffset(280);

...它这么好心滚动到该位置。

... and it so kindly scrolls to that location.

现在的问题是，什么属性现在包含280 的，这样我就可以找回以后

The question is, what property now contains 280, so I can retrieve it later?

（提示：<？code> myScrollViewer.VerticalOffset 和 ContentVerticalOffset 都是0; myScrollViewer.ScrollInfo 刚纯不存在）

(Hint: myScrollViewer.VerticalOffset and ContentVerticalOffset are both 0; myScrollViewer.ScrollInfo just plain doesn't exist.)

编辑：。很显然，我需要一个更详细的论证。

Apparently I need a more detailed demonstration.

private void btnTest_Click(object sender, RoutedEventArgs e) {
  double scrollTarget = 280;
  MessageBox.Show("Target: " + scrollTarget.ToString());
  myScrollViewer.ScrollToVerticalOffset(scrollTarget);
  MessageBox.Show("Now: " + myScrollViewer.VerticalOffset);
}

我要重申，这不按预期滚动 。顺利，这正是我想要的。但是， myScrollViewer.VerticalOffset 设置为0。

I must reiterate that this does scroll as intended. Goes right exactly where I want it to. But, myScrollViewer.VerticalOffset is set at 0.

推荐答案

解决方案是手动调用 myScrollViewer.UpdateLayout（）在 myScrollViewer.ScrollToVerticalOffset（）。然后， myScrollViewer.VerticalOffset 将有期望值。

The solution is to manually call myScrollViewer.UpdateLayout() after myScrollViewer.ScrollToVerticalOffset(). Then, myScrollViewer.VerticalOffset will have the expected value.

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