wpf XAML 中有没有办法在双击时选择文本框中的所有文本？
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Is there a way in XAML to select all text in textbox when double clicked?
提问by KeyboardFriendly
Is there a way to highlight all text in textbox purely through XAML, or does it have to be done in the Xaml.cs
有没有办法纯粹通过 XAML 突出显示文本框中的所有文本，还是必须在 Xaml.cs 中完成
Thanks!
谢谢！
回答by Farhad Jabiyev
This is what you are going to do:
这就是你要做的：
First, add DoubleClickBehavior.csclass to your Project.
首先，将DoubleClickBehavior.cs类添加到您的项目中。
class DoubleClickBehavior : Behavior<TextBox>
{
protected override void OnAttached()
{
AssociatedObject.MouseDoubleClick += AssociatedObjectMouseDoubleClick;
base.OnAttached();
}
protected override void OnDetaching()
{
AssociatedObject.MouseDoubleClick -= AssociatedObjectMouseDoubleClick;
base.OnDetaching();
}
private void AssociatedObjectMouseDoubleClick(object sender, RoutedEventArgs routedEventArgs)
{
AssociatedObject.SelectAll();
}
}
Then in .xaml, add this behavior to your TextBox:
然后在 中.xaml，将此行为添加到您的 TextBox：
<TextBox>
<i:Interaction.Behaviors>
<local:DoubleClickBehavior/>
</i:Interaction.Behaviors>
</TextBox>
You need to add two namepsaces to your .xamlto use your behavior. (The name of my project was WpfApplication1, so you will probably need to change that):
您需要为.xaml您的行为添加两个命名空间。（我的项目名称是WpfApplication1，因此您可能需要更改它）：
xmlns:local ="clr-namespace:WpfApplication1"
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
That's it. Also you need System.Windows.Interactivity.dllto use the Behaviorclass.
就是这样。您还需要System.Windows.Interactivity.dll使用Behavior该类。
You can download it from the Nuget Package Manager.
您可以从Nuget 包管理器下载它。
回答by Bob.
With a TextBox, you can add the PreviewMouseDoubleClickevent.
使用 TextBox，您可以添加PreviewMouseDoubleClick事件。
<TextBox DockPanel.Dock="Top" Name="MyTextBox" AcceptsReturn="True" PreviewMouseDoubleClick="TextBoxSelectAll"/>
Then you set the TextBox.SelectedText Propertyof the TextBoxto the text in the TextBox.
然后，设置TextBox.SelectedText属性的TextBox在文本TextBox。
private void TextBoxSelectAll(object sender, MouseButtonEventArgs e) {
// Set the event as handled
e.Handled = true;
// Select the Text
(sender as TextBox).SelectAll();
}
