c# - C#WPF MVVM DataGrid MouseBinding仅适用于行

我有一个带DataGrid的WPF应用程序，我希望用户能够双击一行以打开一个编辑对话框。

所以我在ViewModel和InputBinding中添加了SelectedItem属性到网格。现在，我的ViewModel中有一个命令，当用户双击网格时会触发该命令。我也得到了正确的选择项。到目前为止，一切都很好。

问题是，当用户单击网格上的某个空白空间时，也会触发该事件(我在图片上标记了它)。



用户应该不能对空白区域执行双击操作。因为事件触发时SelectedItem保持不变。所以这是错误的。

我的DataGrid XAML代码:

<DataGrid Name="dgSafetyFunction" AutoGenerateColumns="False" ItemsSource="{Binding SafetyFunctionList}" Margin="0,0,0,45"
              SelectedItem="{Binding Path=SelectedItem, Mode=TwoWay}" IsReadOnly="True" IsSynchronizedWithCurrentItem="True" SelectionUnit="FullRow">
    <DataGrid.InputBindings>
        <MouseBinding
            MouseAction="LeftDoubleClick"
            Command="{Binding OnDataGridDoubleClickCommand}"/>
    </DataGrid.InputBindings>
    <DataGrid.Columns>
        <DataGridTextColumn Header="ID" Binding="{Binding ID}"/>
        <DataGridTextColumn Header="Name" Binding="{Binding Name}"/>
        <DataGridTextColumn Header="Beschreibung" Binding="{Binding Description}"/>
        <DataGridTextColumn Header="Projekt ID" Binding="{Binding ProjectID}"/>
    </DataGrid.Columns>
</DataGrid>

SelectedItem属性:

private SafetyFunctionModel m_SelectedItem;

public SafetyFunctionModel SelectedItem
{
    get
    {
        return m_SelectedItem;
    }
    set
    {
        if (value != m_SelectedItem)
        {
            m_SelectedItem = value;
            OnPropertyChanged("SelectedItem");
        }
    }
}

如何解决MVVM问题？

问候

最佳答案

定义一个CellTemplate并将MouseBinding移到该代码的根元素中:

<DataGrid Name="dgSafetyFunction" AutoGenerateColumns="False" ItemsSource="{Binding SafetyFunctionList}" Margin="0,0,0,45"
          SelectedItem="{Binding Path=SelectedItem, Mode=TwoWay}" IsReadOnly="True" IsSynchronizedWithCurrentItem="True" SelectionUnit="FullRow">
    <DataGrid.Columns>
        <DataGridTextColumn Header="ID" Binding="{Binding ID}"/>
        <DataGridTextColumn Header="Name" Binding="{Binding Name}"/>
        <DataGridTextColumn Header="Beschreibung" Binding="{Binding Description}"/>
        <DataGridTextColumn Header="Projekt ID" Binding="{Binding ProjectID}"/>
    </DataGrid.Columns>
    <DataGrid.CellStyle>
        <Style TargetType="{x:Type DataGridCell}">
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="BorderBrush" Value="Transparent"/>
            <Setter Property="BorderThickness" Value="1"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type DataGridCell}">
                        <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True">
                            <ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                            <Border.InputBindings>
                                <MouseBinding MouseAction="LeftDoubleClick" Command="{Binding DataContext.OnDataGridDoubleClickCommand,
                                            RelativeSource={RelativeSource AncestorType=DataGrid}}"/>
                            </Border.InputBindings>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <Trigger Property="IsSelected" Value="True">
                    <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.HighlightTextBrushKey}}"/>
                    <Setter Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.HighlightBrushKey}}"/>
                </Trigger>
                <Trigger Property="IsKeyboardFocusWithin" Value="True">
                    <Setter Property="BorderBrush" Value="{DynamicResource {x:Static DataGrid.FocusBorderBrushKey}}"/>
                </Trigger>
                <MultiTrigger>
                    <MultiTrigger.Conditions>
                        <Condition Property="IsSelected" Value="true"/>
                        <Condition Property="Selector.IsSelectionActive" Value="false"/>
                    </MultiTrigger.Conditions>
                    <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightBrushKey}}"/>
                    <Setter Property="BorderBrush" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightBrushKey}}"/>
                    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightTextBrushKey}}"/>
                </MultiTrigger>
                <Trigger Property="IsEnabled" Value="false">
                    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                </Trigger>
            </Style.Triggers>
        </Style>
    </DataGrid.CellStyle>
</DataGrid>

关于c# - C#WPF MVVM DataGrid MouseBinding仅适用于行，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/58423744/