Textbox Enter Key event not in WPF

Question

keydown事件無法正常工作。當按下回車鍵時，我想提高與按鈕相同的事件。這裏是c＃

public partial class Search : Control 
    { 
     public SearchRevision() 
     { 
      InitializeComponent(); 
     } 


     private void Button_Click_1(object sender, RoutedEventArgs e) 
     { 
      SearchViewModel vm = this.DataContext as SearchViewModel; 
      if (vm != null) 
       vm.Refresh(); 
     } 

     private void myTextBox_KeyDown(Object sender, KeyEventArgs e) 
     { 
      if (e.Key == Key.Enter) 
      { 
       SearchViewModel vm = this.DataContext as SearchViewModel; 
       if (vm != null) 
        vm.Refresh(); 
      } 
     } 

     private void myTextBox_Escape(Object sender, KeyEventArgs e) 
     { 
      if (e.Key == Key.Escape) 
      { 
       txtName.Text = ""; 
      } 
     } 
    } 

Answer 1

有沒有必要寫代碼兩次。你也可以這樣做。

private void myTextBox_KeyDown(Object sender, KeyEventArgs e) 
{ 
    if (e.KeyCode == Keys.Enter) 
    { 
     //you may pass the parameters if you need 
     Button_Click_1(null,null); 
    } 
} 

Answer 2

在WPF中沒有的鍵碼或keys.enter 代替你可以使用：

private void myTextBox_KeyDown(Object sender, KeyEventArgs e) 
{ 
    if (e.Key == Key.Enter) 
    { 
     SearchViewModel vm = this.DataContext as SearchViewModel; 
     if (vm != null) 
      vm.Refresh(); 
    } 
} 

Answer 3

在WPF，TextBox元素不會得到機會，利用「回車」創建keyup事件，直到按鈕你不會設置屬性：AcceptsReturn =「True」。

但是，它不能解決處理TextBox元素中的KeyUp事件的問題。按下「ENTER」後，您將在TextBox中獲得新的文本行。

我已經通過使用Bubble事件策略解決了使用TextBox元素的KeyUp事件的問題。這很簡單。你必須在一些（任何）父元素附加keyUp事件處理程序：

XAML：

<Window x:Class="TextBox_EnterButtomEvent.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
     xmlns:local="clr-namespace:TextBox_EnterButtomEvent" 
     mc:Ignorable="d" 
     Title="MainWindow" Height="350" Width="525"> 
    <Grid KeyUp="Grid_KeyUp"> 
     <Grid.RowDefinitions> 
      <RowDefinition/> 
      <RowDefinition Height="Auto"/> 
      <RowDefinition Height="Auto"/> 
      <RowDefinition Height ="0.3*"/> 
      <RowDefinition Height="Auto"/> 
      <RowDefinition Height="Auto"/> 
      <RowDefinition/> 
     </Grid.RowDefinitions> 
     <Grid.ColumnDefinitions> 
      <ColumnDefinition/> 
      <ColumnDefinition/> 
      <ColumnDefinition/> 
     </Grid.ColumnDefinitions> 
     <TextBlock Grid.Row="1" Grid.Column="1" Padding="0" TextWrapping="WrapWithOverflow"> 
      Input text end press ENTER: 
     </TextBlock> 
     <TextBox Grid.Row="2" Grid.Column="1" HorizontalAlignment="Stretch"/> 
     <TextBlock Grid.Row="4" Grid.Column="1" Padding="0" TextWrapping="WrapWithOverflow"> 
      You have entered: 
     </TextBlock> 
     <TextBlock Name="txtBlock" Grid.Row="5" Grid.Column="1" HorizontalAlignment="Stretch"/> 
    </Grid> 
</Window> 

C＃邏輯部分（KeyUp事件處理程序連接到網格元素）：

public partial class MainWindow : Window 
{ 
    public MainWindow() 
    { 
     InitializeComponent(); 
    } 

    private void Grid_KeyUp(object sender, KeyEventArgs e) 
    { 
     if(e.Key == Key.Enter) 
     { 
      TextBox txtBox = e.Source as TextBox; 
      if(txtBox != null) 
      { 
       this.txtBlock.Text = txtBox.Text; 
       this.txtBlock.Background = new SolidColorBrush(Colors.LightGray); 
      } 
     } 
    } 
} 

結果：

Application main window with result