Question

我正在尝试绑定到WPF UserControl中的键事件。该组件是TextBox，我的XAML是

<TextBox Name="textBarCode" Grid.Row="1" Grid.Column="1" Grid.ColumnSpan="2" HorizontalAlignment="Left" VerticalAlignment="Center" Margin="0,0,10,0"  Width="300">
    <TextBox.InputBindings>
        <KeyBinding Key="Enter" Command="{Binding ImportPanel.BarcodeTextEnterKeyCommand}"/>
        <KeyBinding Key="Tab" Command="{Binding ImportPanel.BarcodeTextTabKeyCommand}"/>
    </TextBox.InputBindings>
</TextBox>

我不确定是否需要，但命名空间声明是

<UserControl x:Class="Scimatic.Samples.Actions.ImportPanel"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:ig="http://schemas.infragistics.com/xaml" 
    xmlns:components="clr-namespace:Scimatic.Mondrian.Components;assembly=Mondrian"
    xmlns:sampleInventory="clr-namespace:Scimatic.Mondrian.Views.SampleInventory;assembly=Mondrian"
    xmlns:trackingTags="clr-namespace:Scimatic.Mondrian.Views.TrackingTags;assembly=Mondrian">

在基础xaml.cs文件中声明命令的代码是

_barcodeKeyCommand = new ActionCommand(() =>
{
    if (!_parent && FocusableTagOnBarcode != null)
    {
        trackingInfo.SetFocusOnTag(FocusableTagOnBarcode);
    }
    else
    {
    buttonImport.Focus();
    }
});

设置这些属性的代码是：

/// <summary>
/// The command property for the enter key in the barcode text box
/// </summary>
public ICommand BarcodeTextTabKeyCommand
{
    get
    {
        return _barcodeKeyCommand;
    }
}

The commands are returned in the same class using the same method:

/// <summary>
/// The command property for the enter key in the barcode text box
/// </summary>
public ICommand BarcodeTextEnterKeyCommand
{
    get
    {
        return _barcodeKeyCommand;
    }
}

然而无论我尝试什么（我尝试过各种各样的东西）;我只是无法得到命令被调用。我已经明确做了一些事情，但有人可以帮助我。我对C＃很新，我浪费了两天试图回复文本框中的回车键！

提前谢谢你，

此致

尼尔

Answer 1

绑定将在当前绑定上下文中查找指定的绑定Path。默认情况下，它将是当前DataContext。您可以使用ElementName，Source或RelativeSource更改绑定上下文。因此，在您的情况下，假设BarcodeTextEnterKeyCommand是ImportPanel控件的属性，您可以为控件指定一些名称，然后更改命令绑定

<UserControl 
    x:Class="Scimatic.Samples.Actions.ImportPanel"
    ...
    x:Name="myUserControl">
    <!-- ... -->
    <TextBox Name="textBarCode" ....>
        <TextBox.InputBindings>
            <KeyBinding Key="Enter" Command="{Binding ElementName=myUserControl, Path=BarcodeTextEnterKeyCommand}"/>
            <KeyBinding Key="Tab" Command="{Binding ElementName=myUserControl, Path=BarcodeTextEnterKeyCommand}"/>
        </TextBox.InputBindings>
    </TextBox>
    <!-- ... -->
</UserControl>

在C＃中使用XAML和WPF对TextBox进行键绑定

1 个答案: