我有一个 DataGird
,则包括 Expander
和 ContextMenu
.
这个DataGird
正在分组。而且,它有不同的ContextMenu
Expander
之间和 DataGridItem
.
但是,我想绑定(bind) MenuItem
Command
到我的命令,并通过 DataGird
的SelectedItems
或 SelectedIndex
至Command
.
但是这个命令没有被调用。即使它有效,当我调查某些方法得到目标时,参数也不会通过(如 set property tag
)。
所以,我想知道什么是正确的方法。
一般
<UserControl.DataContext>
<vm:ViewModel x:Name="VM"/>
</UserControl.DataContext>
<Grid>
<DataGrid x:Name="dg"
ItemsSource="{Binding SourceData}"
AutoGenerateColumns="False"
CanUserResizeColumns="False"
CanUserResizeRows="False"
CanUserAddRows="False"
CanUserSortColumns="False"
SelectionMode="Extended"
RowHeaderWidth="0"
GridLinesVisibility="Horizontal">
<DataGrid.CellStyle>
<Style TargetType="DataGridCell">
<Setter Property="BorderThickness" Value="0"/>
<!-- Remove the focus indication for the selected cell -->
<Setter Property="FocusVisualStyle" Value="{x:Null}"/>
</Style>
</DataGrid.CellStyle>
<DataGrid.Columns>
<DataGridTextColumn Header="No." Binding="{Binding No}" />
<DataGridTextColumn Header="Name" Binding="{Binding Name}"/>
</DataGrid.Columns>
<DataGrid.GroupStyle>
<GroupStyle>
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Expander IsExpanded="False" MouseRightButtonDown="Expander_MouseRightButtonDown" ButtonBase.Click="Expander_Click">
<Expander.Header>
<StackPanel Orientation="Horizontal">
<StackPanel.ContextMenu>
<ContextMenu>
<MenuItem Header="Insert" InputGestureText="Ctrl+I" Command="{Binding InsertGroupItems"/>
<MenuItem Header="Remove" InputGestureText="Ctrl+D" Command="{Binding RemoveGroupItems"/>
</ContextMenu>
</StackPanel.ContextMenu>
<TextBlock Text="{Binding Name}"/>
<TextBlock Text="{Binding ItemCount}"/>
<TextBlock Text=" item(s)"/>
</StackPanel>
</Expander.Header>
<ItemsPresenter>
<ItemsPresenter.ContextMenu>
<ContextMenu>
<ContextMenu>
<MenuItem Header="Insert" InputGestureText="Ctrl+I" Command="{Binding InsertSelectedItems" CommandParameter="{Binding ElementName=dg, Path=SelectedIndex}"/>
<MenuItem Header="Remove" InputGestureText="Ctrl+D" Command="{Binding RemoveSelectedItems" CommandParameter="{Binding ElementName=dg, Path=SelectedItems}"/>
</ContextMenu>
</ItemsPresenter.ContextMenu>
</ItemsPresenter>
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
</DataGrid.GroupStyle>
</DataGrid>
</Grid>
这个工作调用命令,但不能传递参数
<DataGrid.GroupStyle>
<GroupStyle>
<GroupStyle.ContainerStyle>
<Style TargetType="{x:Type GroupItem}">
<Style TargetType="{x:Type GroupItem}">
<Setter Property="Tag" Value="{Binding DataContext, RelativeSource={RelativeSource AncestorType=DataGrid}}" />
<Setter Property="ContextMenu">
<Setter.Value>
<ContextMenu>
<MenuItem Header="Insert" InputGestureText="Ctrl+I" Command="{Binding PlacementTarget.Tag.InsertSelectedItems, RelativeSource={RelativeSource AncestorType=ContextMenu}}" CommandParameter="{Binding ElementName=dg, Path=SelectedIndex}"/>
<MenuItem Header="Remove" InputGestureText="Ctrl+D" Command="{Binding PlacementTarget.Tag.RemoveSelectedItems, RelativeSource={RelativeSource AncestorType=ContextMenu}}" CommandParameter="{Binding ElementName=dg, Path=SelectedItems}"/>
</ContextMenu>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Expander IsExpanded="False" MouseRightButtonDown="Expander_MouseRightButtonDown" ButtonBase.Click="Expander_Click">
<Expander.Header>
<StackPanel Orientation="Horizontal">
<StackPanel.ContextMenu>
<ContextMenu>
<MenuItem Header="Insert" InputGestureText="Ctrl+I" Command="{Binding InsertGroupItems}"/>
<MenuItem Header="Remove" InputGestureText="Ctrl+D" Command="{Binding RemoveGroupItems}"/>
</ContextMenu>
</StackPanel.ContextMenu>
<TextBlock Text="{Binding Name}"/>
<TextBlock Text="{Binding ItemCount}"/>
<TextBlock Text=" item(s)"/>
</StackPanel>
</Expander.Header>
<ItemsPresenter/>
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</GroupStyle.ContainerStyle>
</GroupStyle>
</DataGrid.GroupStyle>
顺便说一句,如何转换
SelectedItems
什么时候得到参数?不行
private void Excute(object parameter)
{
IList list = parameter as IList;
foreach (var item in list)
{
Remove((Data)item);
}
}
所以,也许我有三个问题。
ContextMenu
不工作。 CommandParameter
不通过。 SelectedItems
列表? 谢谢!
最佳答案
一个 MenuItem
在 ContextMenu
不能使用 ElementName
绑定(bind)到 DataGrid
因为 ContextMenu
和 DataGrid
属于不同的元素树。
你可以做的是绑定(bind) Tag
ItemsPresenter
的属性(property)到DataGrid
然后绑定(bind)到 DataGrid
的属性通过PlacementTarget
的ContextMenu
:
<ItemsPresenter Tag="{Binding RelativeSource={RelativeSource AncestorType=DataGrid}}">
<ItemsPresenter.ContextMenu>
<ContextMenu>
<MenuItem Header="Insert2" InputGestureText="Ctrl+I"
DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource AncestorType=ContextMenu}}"
Command="{Binding DataContext.InsertSelectedItems}"
CommandParameter="{Binding SelectedIndex}"/>
<MenuItem Header="Remove2" InputGestureText="Ctrl+D"
DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource AncestorType=ContextMenu}}"
Command="{Binding DataContext.RemoveSelectedItems}"
CommandParameter="{Binding SelectedItems}"/>
</ContextMenu>
</ItemsPresenter.ContextMenu>
</ItemsPresenter>
How to convert SelectedItems to a list?
就像你正在做的那样。如果绑定(bind)到
SelectedItems
,这应该可以工作。 DataGrid
的属性(property)作品:private void Execute(object parameter)
{
IList list = parameter as IList;
foreach (var item in list)
{
Remove((Data)item);
}
}
编辑:
当然你不能使用
ElementName
当绑定(bind)到 CommandArgument
任何一个。试试这个:<Style TargetType="{x:Type GroupItem}">
<Setter Property="Tag" Value="{Binding Path=., RelativeSource={RelativeSource AncestorType=DataGrid}}" />
<Setter Property="ContextMenu">
<Setter.Value>
<ContextMenu>
<MenuItem Header="Insert" InputGestureText="Ctrl+I"
Command="{Binding PlacementTarget.Tag.DataContext.InsertSelectedItems, RelativeSource={RelativeSource AncestorType=ContextMenu}}"
CommandParameter="{Binding PlacementTarget.Tag.SelectedIndex, RelativeSource={RelativeSource AncestorType=ContextMenu}}"/>
<MenuItem Header="Remove" InputGestureText="Ctrl+D"
Command="{Binding PlacementTarget.Tag.DataContext.RemoveSelectedItems, RelativeSource={RelativeSource AncestorType=ContextMenu}}"
CommandParameter="{Binding PlacementTarget.Tag.SelectedItems, RelativeSource={RelativeSource AncestorType=ContextMenu}}"/>
</ContextMenu>
</Setter.Value>
</Setter>
关于c# - 为什么 ContextMenu Command 和 CommandParameter 在 DataGrid 中不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/43544011/