无需 Blend SDK 或第三方即可将事件绑定到命令。 (WPF/MVVM)

Question

有没有办法将事件绑定到命令 而无需 System.Windows.Interactivity 或任何其他第三方库？

到目前为止，我已经尝试了以下方法：

<Style TargetType="DataGridRow">
      <EventSetter Event="MouseDoubleClick"
      Handler="{Binding DoubleClickCommand}" />
</Style>

和

<DataGrid.InputBindings>
      <MouseBinding Gesture="LeftDoubleClick" Command="{Binding DoubleClickCommand}"/>
</DataGrid.InputBindings>

和

<DataGrid ItemsSource="{Binding Model.SpectrumCollections}"
          ColumnWidth="*"
          AutoGenerateColumns="false"
          IsReadOnly="True" 
          BorderThickness="0"
          HeadersVisibility="Column" MouseDoubleClick="{Binding DoubleClickCommand}">

但似乎没有任何效果，我们将不胜感激。

编辑 1：这是我使用的RelayCommand的实现，也许问题出在这里..

public class RelayCommand : ICommand
{
    private readonly Func<bool> _canExecute;

    private readonly Action _execute;

    public RelayCommand(Action inExecute, Func<bool> inCanExecute = null)
    {
        _execute = inExecute ?? throw new Helper.Exceptions.DelegateCommandException(
                       Exceptions.InExecuteIsNullException);
        _canExecute = inCanExecute;
    }

    public event EventHandler CanExecuteChanged
    {
        add => CommandManager.RequerySuggested += value;
        remove => CommandManager.RequerySuggested -= value;
    }

    public bool CanExecute(object inObject) => _canExecute?.Invoke() ?? true;

    public void Execute(object inObject) => _execute?.Invoke();
}

Answer 1

您不能执行以下操作，因为 MouseDoubleClick 是事件而不是依赖项属性:

MouseDoubleClick="{Binding DoubleClickCommand}">

您可以绑定到 MouseBinding 的 Command 属性：

<DataGrid.InputBindings>
    <MouseBinding Gesture="LeftDoubleClick" Command="{Binding DoubleClickCommand}"/>
</DataGrid.InputBindings>

如果要在双击单元格时调用命令，应将MouseBinding添加到DataGridCell:

<DataGrid x:Name="dg" AutoGenerateColumns="False">
    <DataGrid.CellStyle>
        <Style TargetType="DataGridCell">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type DataGridCell}">
                        <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True">
                            <ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">
                                <ContentPresenter.InputBindings>
                                    <MouseBinding Gesture="LeftDoubleClick"
                                                  Command="{Binding DataContext.DoubleClickCommand,RelativeSource={RelativeSource AncestorType=DataGrid}}"/>
                                </ContentPresenter.InputBindings>
                            </ContentPresenter>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </DataGrid.CellStyle>
    <DataGrid.InputBindings>
        <MouseBinding Gesture="LeftDoubleClick" Command="{Binding DoubleClickCommand}"/>
    </DataGrid.InputBindings>
    <DataGrid.Columns>
        <DataGridTextColumn Header="Name" Binding="{Binding Name}" />
    </DataGrid.Columns>
</DataGrid>

无需 Blend SDK 或第三方即可将事件绑定到命令。 (WPF/MVVM)

Binding Events to Commands without Blend SDK or third party. (WPF / MVVM)

c#

wpf

mvvm

wpf-controls

wpfdatagrid