放置在ItemsControl中时，单击事件不会触发上下文菜单

Question

我有一个ContextMenu，它被定义为ItemsControl.ItemTemplate -> DataTemplate的一部分。问题是我无法在后面的代码中获得Click事件通知。以下是我的代码的简化版本：

型号：

public class RunYear
{
    public RunYear(int year)
    {
        Year = year;
        Months = new Month[3];
    }
    public int Year { get; set; }
    public Month[] Months { get; set; }
}

public class Month
{
    public int ColumnIndex { get; set; }
    public string MonthName { get; set; }
    // some other props
}

XAML代码背后：

    private ObservableCollection<RunYear> _years = new ObservableCollection<RunYear>();
    public ObservableCollection<RunYear> Years { get{return _years; } }
    public MainWindow()
    {
        InitializeComponent();
        GenerateData();
    }

    private void GenerateData()
    {
        for (int i = 2010; i < 2015; i++)
        {
            var runYear = new RunYear(i);
            runYear.Months[0] = new Month() { ColumnIndex = 0, MonthName = $"Jan {i}" };
            runYear.Months[1] = new Month() { ColumnIndex = 1, MonthName = $"Feb {i}" };
            runYear.Months[2] = new Month() { ColumnIndex = 2, MonthName = $"Mar {i}" };
            Years.Add(runYear);
        }
    }

    public void OnManageClicked(object sender, RoutedEventArgs args)
    {
        MessageBox.Show("manage");
    }

    public void OnDeleteClicked(object sender, RoutedEventArgs args)
    {
        MessageBox.Show("delete");
    }

XAML：

<Window x:Class="SimplerOne.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:SimplerOne"
    mc:Ignorable="d"
    DataContext="{Binding RelativeSource={RelativeSource Self}}"
    Title="MainWindow" Height="450" Width="800">
<Grid>

    <ItemsControl Name="icYears" ItemsSource="{Binding Years}">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <Grid>
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="70" />
                        <ColumnDefinition Width="*" />
                    </Grid.ColumnDefinitions>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="75"/>
                    </Grid.RowDefinitions>
                    <Label Grid.Column="0" Grid.Row="0" Content="{Binding Year}" />

                    <ItemsControl Grid.Column="1" Name="icMonths" ItemsSource="{Binding Months}">
                        <ItemsControl.Resources>
                            <ContextMenu x:Key="ctxMenuFilingFrequency">
                                <MenuItem Header="Manage" Click="OnManageClicked" />
                                <MenuItem Header="Delete" Click="OnDeleteClicked" />
                            </ContextMenu>
                        </ItemsControl.Resources>
                        <ItemsControl.ItemsPanel>
                            <ItemsPanelTemplate>
                                <Grid >
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="*" />
                                        <ColumnDefinition Width="*" />
                                        <ColumnDefinition Width="*" />
                                    </Grid.ColumnDefinitions>
                                    <Grid.RowDefinitions>
                                        <RowDefinition Height="75"></RowDefinition>
                                    </Grid.RowDefinitions>
                                </Grid>
                            </ItemsPanelTemplate>
                        </ItemsControl.ItemsPanel>
                        <ItemsControl.ItemContainerStyle>
                            <Style>
                                <Setter Property="Grid.Column" Value="{Binding ColumnIndex}" />
                            </Style>
                        </ItemsControl.ItemContainerStyle>
                        <ItemsControl.ItemTemplate>
                            <DataTemplate>
                                <Border BorderThickness="0.5" BorderBrush="Black">
                                    <StackPanel Background="White">
                                        <StackPanel.Style>
                                            <Style TargetType="{x:Type StackPanel}">
                                                <Setter Property="ContextMenu" Value="{StaticResource ctxMenuFilingFrequency}"></Setter>
                                            </Style>
                                        </StackPanel.Style>
                                        <TextBlock Text="{Binding MonthName}"  Padding="2" Margin="2"></TextBlock>
                                    </StackPanel>
                                </Border>
                            </DataTemplate>
                        </ItemsControl.ItemTemplate>
                    </ItemsControl>
                </Grid>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>
</Grid>

Answer 1

您可以使用CallMethodAction中的WPF。

只需将Microsoft.Expression.Interactions和System.Windows.Interactivity添加到您的项目中即可。

XAML代码

<ItemsControl.Resources>
    <ContextMenu x:Key="ctxMenuFilingFrequency">
        <!--<MenuItem Header="Manage" Click="OnManageClicked" />-->
        <MenuItem Header="Manage">
            <i:Interaction.Triggers>
                <i:EventTrigger EventName="Click">
                    <ei:CallMethodAction MethodName="ManageClicked" TargetObject="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=local:MainWindow}}" />
                </i:EventTrigger>
            </i:Interaction.Triggers>
        </MenuItem>
    </ContextMenu>
</ItemsControl.Resources>

在XAML代码中使用它。

C＃代码落后（MainWindow.cs）

public void ManageClicked()
{
    //I get fired from XAML
}

在代码后面定义一个方法。它让我public void没有任何参数！