c# - 捕获 WPF TextBox 上的鼠标点击

Question

我想捕获鼠标在 TextBox 上的点击:

<Window x:Class="WpfApplication2.Window1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Window1" Height="300" Width="300">
    <Grid>
        <TextBox x:Name="t" MouseDown="TextBox_MouseDown"
                 MouseLeftButtonDown="TextBox_MouseLeftButtonDown"
                 MouseLeftButtonUp="TextBox_MouseLeftButtonUp"
                 Height="50" />
    </Grid>
</Window>

现在我只在用户首次输入 TextBox 时收到鼠标单击事件。此 TextBox 获得键盘焦点后，我不再收到鼠标单击事件。知道如何让它工作吗？

Answer 1

TextBox Class

TextBox has built-in handling for thebubbling MouseUp and MouseDownevents. Consequently, custom eventhandlers that listen for MouseUp orMouseDown events from a TextBox willnot be called. If you need to respondto these events, listen for thetunneling PreviewMouseUp andPreviewMouseDown events instead, orregister the handlers with theHandledEventsToo argument (this latteroption is only available throughcode). Do not mark the event handledunless you deliberately want todisable TextBox native handling ofthese events, and be aware that thishas notable effects on the control'sUI.

在您的代码中，您仅触发 MouseLeftButtonUp