WPF：列表视图：使用 MVVM 模式在 ListView 项上绑定双击事件

Question

使用 MVVM 模式我正在绑定 ListView 控件的 Item 源，使用以下 xaml 代码绑定双击事件，

使用：

  <i:Interaction.Triggers>
     <i:EventTrigger EventName="MouseDoubleClick">
          <z:EventToCommand Command="{Binding RelativeSource={RelativeSource TemplatedParent},Path=MouseDoubleClick}"/>
      </i:EventTrigger>

当我双击列表视图项时，我无法执行我的功能。

如何有效地在 MVVM 模式中附加双击事件？

Answer 1

我在我的项目中使用它。

 <DataGrid.InputBindings>
     <MouseBinding MouseAction="LeftDoubleClick"
             Command="{Binding Path=EditEntityCommand}"
             CommandParameter="{Binding ElementName=DataGrid, Path=SelectedItem}"/>
  </DataGrid.InputBindings>

好的，对于 ListView，您必须将 Binding 设置为 ListViewItems

    <ListView x:Name="listView1" Grid.Row="2" ItemsSource="{Binding VmUsers}">
        <ListView.ItemTemplate>
            <DataTemplate>
                <ContentPresenter Content="{Binding}">
                    <ContentPresenter.InputBindings>
                        <MouseBinding MouseAction="LeftDoubleClick" 
                                      Command="{Binding DataContext.MyCommand, ElementName=listView1}" 
                                      CommandParameter="{Binding ElementName=listView1,Path=SelectedItem}"/>
                    </ContentPresenter.InputBindings>
                </ContentPresenter>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>

或者你使用交互工具

<ListView Name="listView1" ItemsSource="{Binding Cars}">
  <i:Interaction.Triggers>
    <i:EventTrigger EventName="LeftDoubleClick">
        <i:InvokeCommandAction Command="{Binding ItemSelectCommand}" CommandParameter="{Binding ElementName=listView1,Path=SelectedItem}" />
    </i:EventTrigger>
   </i:Interaction.Triggers>
 </ListView>

Answer 2

如果你想在代码隐藏中做到这一点，你可以这样做

编辑

XAML

<Window x:Class="Q9.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:Q9"
    mc:Ignorable="d"
    Title="MainWindow" Height="350" Width="525">
<Grid>
    <ListView ItemsSource="{Binding Cars}" SelectedItem="{Binding SelectedCar,Mode=TwoWay}">
        <ListView.ItemsPanel>
            <ItemsPanelTemplate>
                <StackPanel Orientation="Vertical"/>
            </ItemsPanelTemplate>
        </ListView.ItemsPanel>
        <ListView.ItemTemplate>
            <DataTemplate>
                <Grid >
                    <Grid.InputBindings>
                        <MouseBinding Gesture="LeftDoubleClick" Command="{Binding Path=DataContext.ShowCarInformationCommand, RelativeSource={RelativeSource AncestorType={x:Type ListView}}}"/>
                    </Grid.InputBindings>
                    <TextBlock Text="{Binding Name}" Height="30" HorizontalAlignment="Stretch"/>
                </Grid>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>
</Grid>

代码隐藏

   using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace Q9
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = new ViewModel();
        }
    }
}

视图模型

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Q9
{
    public class ViewModel : System.ComponentModel.INotifyPropertyChanged
    {
        private ShowCarInformationCommand mShowCarInformationCommand;

        public ShowCarInformationCommand ShowCarInformationCommand
        {
            get
            {
                if (mShowCarInformationCommand == null)
                {
                    mShowCarInformationCommand = new ShowCarInformationCommand(this);
                }
                return mShowCarInformationCommand;
            }
            set
            {
                mShowCarInformationCommand = value;
            }
        }
        private System.Collections.ObjectModel.ObservableCollection<Car> mCars;

        public System.Collections.ObjectModel.ObservableCollection<Car> Cars
        {
            get
            {
                if (mCars == null)
                {
                    mCars = new System.Collections.ObjectModel.ObservableCollection<Car>();
                }
                return mCars;
            }
            set
            {
                mCars = value;
            }
        }
        private Car mSelectedCar;

        public Car SelectedCar
        {
            get
            {
                return mSelectedCar;
            }
            set
            {
                mSelectedCar = value;
                OnPropertyChanged("SelectedCar");
            }
        }

        public ViewModel()
        {
            Cars.Add(new Car() { Name = "Honda" });
            Cars.Add(new Car() { Name = "Ferrari" });
            Cars.Add(new Car() { Name = "Bentley" });
        }
        public event PropertyChangedEventHandler PropertyChanged;
        protected virtual void OnPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;
            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }
}

项目类别：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Q9
{
    public class Car
    {


        private System.String mName;

        public System.String Name
        {
            get { return mName; }
            set { mName = value; }
        }

    }
    public class ShowCarInformationCommand : System.Windows.Input.ICommand
    {
        public event EventHandler CanExecuteChanged;

        public bool CanExecute(object parameter)
        {
            return true;
        }
        ViewModel Model;
        public ShowCarInformationCommand(ViewModel model)
        {
            Model = model;
        }
        public void Execute(object parameter)
        {
            System.Windows.MessageBox.Show(Model.SelectedCar.Name);
        }
    }
}