Question

我已创建了带有预定义MenuItems的上下文菜单样式：

    <Style TargetType="{x:Type ContextMenu}" x:Key="DataGridColumnFilterContextMenu">                
                <Setter Property="ContextMenu.Template">
                <Setter.Value>
                    <ControlTemplate>
                        <Border BorderBrush="#868686"
                                BorderThickness="1"
                                Background="#FAFAFA"> 
                                <Grid MaxHeight="500">
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="Auto"/>
                                    <RowDefinition Height="*"/>
                                </Grid.RowDefinitions>
                                <StackPanel>
                                    <MenuItem Header="Filtrēt" StaysOpenOnClick="True" Name="DynSearch">
                                        <MenuItem.Icon>
                                            <Image   RenderOptions.BitmapScalingMode="NearestNeighbor"
                                                     RenderOptions.EdgeMode="Aliased" 
                                                     Source="/Furniture;component/Resources/search4.png" />
                                        </MenuItem.Icon>
                                    </MenuItem>
                                    <Separator  Margin="20 5 20 0"  Height="2" Width="Auto" />
                                    <MenuItem Margin="5 5 0 0" StaysOpenOnClick="True" >
                                        <MenuItem.Template>
                                            <ControlTemplate >
                                                <CheckBox Padding="15 0 0 0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" >Iezīmēt/Atzīmēt visus</CheckBox>
                                            </ControlTemplate>
                                        </MenuItem.Template>
                                        <MenuItem.Icon>
                                            <Image   RenderOptions.BitmapScalingMode="NearestNeighbor"
                                                     RenderOptions.EdgeMode="Aliased" 
                                                     Source="/Furniture;component/Resources/search4.png" />
                                        </MenuItem.Icon>
                                    </MenuItem>
                                    <Separator Margin="20 5 20 0" Height="2" Width="Auto" />
                                    <RadioButton Margin="5 5 0 0" Padding="15 0 0 0" GroupName="Sorting" Content="Augoša secībā" IsChecked="True"/>
                                    <RadioButton Margin="5 5 0 0" Padding="15 0 0 0" GroupName="Sorting" Content="Dilstoša secībā" />
                                    <Separator Margin="20 5 20 5" Height="2" Width="Auto" />
                                </StackPanel>
                                <ScrollViewer Grid.Row="1" 
                                              Margin="1,0,1,0"                                            
                                              CanContentScroll="True"
                                              VerticalScrollBarVisibility="Auto"
                                              Grid.ColumnSpan="2">
                                        <ItemsPresenter KeyboardNavigation.DirectionalNavigation="Cycle" />
                                    </ScrollViewer>
                                </Grid>                              
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>

现在我将样式分配给新的ContextMenu，并希望将Click事件处理程序分配给样式中定义的MenuItem，标题为“Filtrēt”。我尝试过这样做：

ContextMenu cm = new ContextMenu();
cm.Style = Application.Current.Resources["DataGridColumnFilterContextMenu"] as Style;
var controlList = ((((cm.Template.LoadContent() as Border).Child as Grid).Children)[0] as StackPanel).Children;
MenuItem filterItem = (controlList[0] as MenuItem);
filterItem.Click += MiFiltre_Click;

当我点击调试器它没有来到MiFiltre_Click方法。我尝试了不同的事件，如MouseDown和PreviewMouseDown。此外，我试图绑定ICommand，这也没有用。

然后我搜索了这个问题并意识到cm.Template.LoadContent（）可能实际上创建了我的ContextMenu模板的新实例，并且我试图将我的事件处理程序绑定到不同的控件实例。然后我尝试使用VisualTreeHelper和LogicalTreeHelper获取ContextMenu节点控件，这也不起作用。

所以这里有问题：

如何实现Click事件处理程序绑定？
如果第一个问题也是如此很难，那么如何定义ContextMenu子节点的当前实例在自定义风格？

Answer 1

我将假设此菜单样式在名为＆＃34; MyResources.xaml＆＃34;的资源字典中定义。

在同一项目文件夹中创建一个类文件，并将其命名为＆＃34; MyResources.xaml.cs＆＃34;。

将它设为像这样的部分类：

namespace WhateverNamespace
{
    public partial class MyResources
    {
        private void FilterMenuItem_Click(object sender, RoutedEventArgs e)
        {
            MenuItem mi = (MenuItem)sender;

            //  Below, PlacementTarget is the control the user right-clicked on. 
            //  Use that directly if you want that instead of its viewmodel. 

            //  This works with the conventional ContextMenu defined below.
            //ViewModel viewModel = ((FrameworkElement)((ContextMenu)mi.Parent).PlacementTarget).DataContext as ViewModel;

            //  This works with your template design. The only difference is 
            //  TemplatedParent instead of Parent. 
            ViewModel viewModel = 
                ((FrameworkElement)((ContextMenu)mi.TemplatedParent).PlacementTarget)
                .DataContext as ViewModel;

            MessageBox.Show("FilterMenuItem_Click");
        }
    }
}

为资源字典提供x:Class属性：

<ResourceDictionary 
    x:Class="WhateverNamespace.MyResources"

连接处理程序：

<MenuItem 
    Click="FilterMenuItem_Click"
    Header="Filtrēt" 
    StaysOpenOnClick="True" 
    Name="DynSearch">

顺便说一句，您不需要使用样式和模板来创建ContextMenu资源：

<ContextMenu x:Key="DataGridColumnFilterContextMenu">
    <MenuItem 
        Click="FilterMenuItem_Click"
        Header="Filtrēt" 
        StaysOpenOnClick="True" 
        Name="DynSearch">
        <MenuItem.Icon>
            <Image
                RenderOptions.BitmapScalingMode="NearestNeighbor"
                RenderOptions.EdgeMode="Aliased" 
                Source="/Furniture;component/Resources/search4.png"
                />
        </MenuItem.Icon>
    </MenuItem>
    <Separator />
    <MenuItem StaysOpenOnClick="True">
        <MenuItem.Header>
            <CheckBox>Iezīmēt/Atzīmēt visus</CheckBox>
        </MenuItem.Header>
        <MenuItem.Icon>
            <Image   
                RenderOptions.BitmapScalingMode="NearestNeighbor"
                RenderOptions.EdgeMode="Aliased" 
                Source="/Furniture;component/Resources/search4.png"
                />
        </MenuItem.Icon>
    </MenuItem>
    <Separator />
    <MenuItem>
        <MenuItem.Header>
            <RadioButton GroupName="Sorting" Content="Augoša secībā" IsChecked="True"/>
        </MenuItem.Header>
    </MenuItem>
    <MenuItem>
        <MenuItem.Header>
            <RadioButton GroupName="Sorting" Content="Dilstoša secībā" IsChecked="True"/>
        </MenuItem.Header>
    </MenuItem>
</ContextMenu>

将事件处理程序分配给自定义样式中定义的ContextMenu项

1 个答案: