WPF单击事件处理程序获取文本块文本 [英] WPF click event handler get textblock text

问题描述

我的xaml中有一个文本块:

I have a text block in my xaml:

<DataTemplate x:Key="InterfacesDataTemplate"
              DataType="ca:Interface">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <TextBlock Grid.Column="1" Text="{Binding Path=Name}" 
                   MouseLeftButtonDown="interface_mouseDown"/>
    </Grid>
</DataTemplate>

在后面的代码中，我有一个用于单击(双击)的事件处理程序

On the code behind I have an event handler for click (double-click)

private void interface_mouseDown(object sender, MouseButtonEventArgs e)
{
    var tb = sender as TextBox;
    if (e.ClickCount == 2)
        MessageBox.Show("Yeah interfac " + tb.Text);
}

我收到了NullReferenceException.

I'm getting a NullReferenceException.

推荐答案

var tb = sender as TextBox

这将导致 null ，因为它实际上是一个 TextBlock .

This results in null because it's actually a TextBlock.

只需更改为

var tb = sender as TextBlock

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