TextBox 事件

梦里梦外; 2023-08-17 16:53 11阅读 0赞

1.键盘事件

![1138839-20190804234747173-1432779164.png][]

界面代码：

<Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="auto"></RowDefinition>
                <RowDefinition Height="*"></RowDefinition>
                <RowDefinition Height="auto"></RowDefinition>
            </Grid.RowDefinitions>
            <DockPanel Grid.Row="0">
                <TextBlock>Type here:</TextBlock>
                <TextBox Focusable="True" Width="710" PreviewKeyDown="PKeyUpAndDown" PreviewKeyUp="PKeyUpAndDown" KeyDown="PKeyUpAndDown" KeyUp="PKeyUpAndDown" PreviewTextInput="PTextInput" TextInput="PTextInput"></TextBox>
            </DockPanel>
            <ListBox Grid.Row="1" Margin="10,10,10,44" Name="mylistbox"></ListBox>
            <Button Click="Button_Click_2" Grid.Row="2" HorizontalAlignment="Right" Width="60" Margin="0,0,20,30">clear</Button>
        </Grid>

事件代码：

private void Button_Click_2(object sender, RoutedEventArgs e)
            {
                this.mylistbox.Items.Clear();
            }
    
            private void PKeyUpAndDown(object sender, KeyEventArgs e)
            {
                string message = "Event:" + e.RoutedEvent + "  " + "key:" + e.Key;
                this.mylistbox.Items.Add(message);
            }
    
            private void PTextInput(object sender, TextCompositionEventArgs e)
            {
                string message = "Event:" + e.RoutedEvent + "  " + "key:" + e.Text;
                this.mylistbox.Items.Add(message);
            }

效果图：

![1138839-20190804235107879-1859897024.png][]

2.选中事件

![1138839-20190808214307400-2125725682.png][]

前端代码

<Grid>
            <Grid.RowDefinitions>
                <RowDefinition></RowDefinition>
                <RowDefinition></RowDefinition>
            </Grid.RowDefinitions>
            <TextBox Grid.Row="0" Name="textbox1" TextWrapping="Wrap" SelectionChanged="TextBox_SelectionChanged">
                hello world
                hello world
                hello world
                hello world
            </TextBox>
            <TextBlock  Grid.Row="1" Name="tb"></TextBlock>
        </Grid>

后台代码

private void TextBox_SelectionChanged(object sender, RoutedEventArgs e)
            {
                if (this.textbox1.SelectionLength == 0) return;
                this.tb.Text = $"选择 {this.textbox1.SelectionStart} to {this.textbox1.SelectionLength} :{this.textbox1.SelectedText}";
            }

事件效果：

![1138839-20190808214457186-1682790347.png][]

转载于:https://www.cnblogs.com/wskxy/p/11300623.html

[1138839-20190804234747173-1432779164.png]: /images/20230809/e9c778bf38a94915b85c17cdb75e94df.png
[1138839-20190804235107879-1859897024.png]: /images/20230809/a4e3799744964dd390be15e0a0e11ae9.png
[1138839-20190808214307400-2125725682.png]: /images/20230809/93fb25acebd64882850954f6d5736d7f.png
[1138839-20190808214457186-1682790347.png]: /images/20230809/6d14e700aeda4a0893d83892e58e4378.png