Question

我想在双击任何列表项时显示对话框。但程序的流程永远不会进入ShowTextCommand属性。我得到名称列表（工作正常），但我无法得到对话框。这是我的XAML：

<ListView  ItemsSource="{Binding List}"  >
        <ListView.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding Name}">
                    <TextBlock.InputBindings>
                        <MouseBinding MouseAction="LeftDoubleClick"  Command="{Binding ShowTextCommand, UpdateSourceTrigger=PropertyChanged}"></MouseBinding>
                    </TextBlock.InputBindings>
                </TextBlock>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>

这是我的Command类：

public class EnterTextCommand : ICommand
{
    public EnterTextCommand(TekstoviViewModel vm)
    {
        ViewModel = vm;
    }
    private TekstoviViewModel ViewModel;
    #region ICommand interface
    public event EventHandler CanExecuteChanged
    {
        add { CommandManager.RequerySuggested += value; }
        remove { CommandManager.RequerySuggested -= value; }
    }
    public bool CanExecute(object parameter)
    {
        return true;
       // return ViewModel.CanExecute;
    }


    public void Execute(object parameter)
    {
        ViewModel.EnterText();
    }
    #endregion
}

和视图模型

 private ICommand command;
    public ICommand ShowTextCommand
    {
        get
        {
            if (command == null)
                command = new EnterTextCommand(this);
            return command;
        }
 internal void EnterText()
    {
        MessageBox.Show("Event Success");
    }

有人可以帮忙吗？

Answer 1

您的DataTemplate找不到command，请使用ElementName绑定指定其完整路径

<ListView  ItemsSource="{Binding List}"  x:Name="MainList">
        <ListView.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding Name}">
                    <TextBlock.InputBindings>
                        <MouseBinding MouseAction="LeftDoubleClick"  Command="{Binding DataContext.ShowTextCommand, UpdateSourceTrigger=PropertyChanged,ElementName=MainList}"></MouseBinding>
                    </TextBlock.InputBindings>
                </TextBlock>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>

在WPF中使用MVVM的ListItem上的MouseDoubleClick

1 个答案: