C#/WPF - 获取 ScrollViewer 滚动位置？
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C#/WPF - Get ScrollViewer scroll position?
提问by DigitalMan
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.
好了，大家都知道如何设置ScrollViewer的滚动位置了。已经写了整篇文章和博客条目ScrollViewer.ScrollToVerticalOffset()，这里有数百个问题及其答案。
So, I enter:
所以，我输入：
myScrollViewer.ScrollToVerticalOffset(280);
... and it so kindly scrolls to that location.
...它非常友好地滚动到那个位置。
The question is, what property now contains 280, so I can retrieve it later?
问题是，现在什么属性包含 280，以便我以后可以检索它？
(Hint: myScrollViewer.VerticalOffsetand ContentVerticalOffsetare both 0; myScrollViewer.ScrollInfojust plain doesn't exist.)
（提示：myScrollViewer.VerticalOffset和ContentVerticalOffset都是 0；myScrollViewer.ScrollInfo只是简单的不存在。）
EDIT: Apparently I need a more detailed demonstration.
编辑：显然我需要更详细的演示。
private void btnTest_Click(object sender, RoutedEventArgs e) {
double scrollTarget = 280;
MessageBox.Show("Target: " + scrollTarget.ToString());
myScrollViewer.ScrollToVerticalOffset(scrollTarget);
MessageBox.Show("Now: " + myScrollViewer.VerticalOffset);
}
I must reiterate that this does scrollas intended. Goes right exactly where I want it to. But, myScrollViewer.VerticalOffsetis set at 0.
我必须重申，这确实按预期滚动。正好在我想要的地方。但是，myScrollViewer.VerticalOffset设置为 0。
采纳答案by DigitalMan
The solution is to manually call myScrollViewer.UpdateLayout()after myScrollViewer.ScrollToVerticalOffset(). Then, myScrollViewer.VerticalOffsetwill have the expected value.
该解决方案是手动呼叫myScrollViewer.UpdateLayout()之后myScrollViewer.ScrollToVerticalOffset()。那么，myScrollViewer.VerticalOffset就会有期望值。
回答by Erti-Chris Eelmaa
Make sure your VerticalScrollBarVisibility="Visible" and VerticalScrollOffset will be 280 after LayoutUpdated event has been fired.
确保在触发 LayoutUpdated 事件后您的 VerticalScrollBarVisibility="Visible" 和 VerticalScrollOffset 将为 280。
回答by Mullaly
I think you are calling the myscrollViewer in the constructor of the window.
我认为您正在窗口的构造函数中调用 myscrollViewer 。
You can call them when you click a button or in loaded method for the window, so that the value gets updated in vertical offset values. That is, these value gets updated after you initialize your window!
您可以在单击按钮或窗口的加载方法时调用它们，以便在垂直偏移值中更新值。也就是说，这些值会在您初始化窗口后更新！
