我正在尝试在具有多个命令绑定(bind)的 DataGrid 上创建一个上下文菜单。有些必须绑定(bind)到本地 ViewModel(即 Row 的 ViewModel),有些必须绑定(bind)到父 ViewModel。
到目前为止,我没有遵循其他解决方案。我只执行子命令。
主视图模型
public class MainViewModel : ViewModelBase
{
public ObservableCollection<SubViewModel> Items { get; private set; }
public MainViewModel()
{
Items = new ObservableCollection<SubViewModel>();
Items.Add(new SubViewModel());
Items.Add(new SubViewModel());
}
private RelayCommand _mainCommand;
public ICommand MainCommand
{
get
{
if (_mainCommand == null)
{
_mainCommand = new RelayCommand(
() =>
{
Debug.WriteLine("MAINCOMMAND EXECUTED");
}
);
}
return _mainCommand;
}
}
}
subview 模型
public class SubViewModel : ViewModelBase
{
private RelayCommand _subCommand;
public ICommand SubCommand
{
get
{
if (_subCommand == null)
{
_subCommand = new RelayCommand(
() =>
{
Debug.WriteLine("SUBCOMMAND EXECTUED");
}
);
}
return _subCommand;
}
}
}
主窗口
<Window x:Class="WpfApplication4.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow"
Width="525"
Height="350"
DataContext="{Binding Source={StaticResource Locator},
Path=Main}">
<Grid>
<DataGrid ItemsSource="{Binding Items}">
<DataGrid.RowStyle>
<Style TargetType="{x:Type DataGridRow}">
<Setter Property="ContextMenu">
<Setter.Value>
<ContextMenu DataContext="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource Self}}">
<MenuItem Command="{Binding DataContext.MainCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ContextMenu}}}" Header="Main" />
<MenuItem Command="{Binding SubCommand}" Header="Sub" />
</ContextMenu>
</Setter.Value>
</Setter>
</Style>
</DataGrid.RowStyle>
</DataGrid>
</Grid>
</Window>
最佳答案
我找到了一种方法,但我认为它不太优雅,也许有更好的方法,但这会起作用:
<Window x:Class="WpfApplication4.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow"
Width="525"
Height="350"
DataContext="{Binding Source={StaticResource Locator},
Path=Main}">
<Grid x:Name="Grid">
<DataGrid x:Name="DataGrid" ItemsSource="{Binding Items}">
<DataGrid.RowStyle>
<Style TargetType="{x:Type DataGridRow}">
<Setter Property="ContextMenu">
<Setter.Value>
<ContextMenu>
<MenuItem Command="{Binding Path=PlacementTarget.Tag.MainCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ContextMenu}}}" Header="Main" />
<MenuItem Command="{Binding SubCommand}" Header="Sub" />
</ContextMenu>
</Setter.Value>
</Setter>
<Setter Property="Tag" Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type DataGrid}}, Path=DataContext}" />
</Style>
</DataGrid.RowStyle>
</DataGrid>
</Grid>
</Window>
关于wpf - ContextMenu 命令绑定(bind)到父级和自身,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24781646/