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 the bubbling MouseUp and MouseDown events. Consequently, custom event handlers that listen for MouseUp or MouseDown events from a TextBox will not be called. If you need to respond to these events, listen for the tunneling PreviewMouseUp and PreviewMouseDown events instead, or register the handlers with the HandledEventsToo argument (this latter option is only available through code). Do not mark the event handled unless you deliberately want to disable TextBox native handling of these events, and be aware that this has notable effects on the control's UI.

在您的代码中，您仅触发 MouseLeftButtonUp