WPF MVVM DataGrid中 滑动鼠标滚轮会触发 checkbox的Unchecked事件
0
悬赏园豆：40
[待解决问题]
在UI界面中，勾选第一条数据，无论怎样滑动滚轮 ，不会出发 UnChecked绑定的Command
但勾选第一条数据后，在勾选任务位置的数据，然后滑动滚轮，就会触发 UnChecked绑定的Command事件
xmal如下：
<DataGrid Margin="3"
ItemsSource="{Binding TableStructCheckDtos}"
x:Name="DataGrids" GridLinesVisibility="None" BorderThickness="0" AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTemplateColumn>
<DataGridTemplateColumn.Header>
<CheckBox IsChecked="{Binding DataContext.AllSelected,Mode=TwoWay
,UpdateSourceTrigger=PropertyChanged,RelativeSource={RelativeSource AncestorType=local:PageTableStructCheck,AncestorLevel=1}}">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Checked">
<i:InvokeCommandAction
Command="{Binding DataContext.AllSelectedChangedCallback,RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}"
CommandParameter="{Binding AllSelectedx}"></i:InvokeCommandAction>
</i:EventTrigger>
<i:EventTrigger EventName="Unchecked">
<i:InvokeCommandAction
Command="{Binding DataContext.UnAllSelectedChangedCallback,RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}"
CommandParameter="{Binding AllSelected}"></i:InvokeCommandAction>
</i:EventTrigger>
</i:Interaction.Triggers>
</CheckBox>
</DataGridTemplateColumn.Header>
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<CheckBox x:Name="cbXh" VerticalAlignment="Center"
IsChecked="{Binding IsChecked,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}">
<i:Interaction.Triggers>
<i:EventTrigger EventName="Checked">
<i:InvokeCommandAction
Command="{Binding DataContext.SelectedChangedCallback,RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}"
CommandParameter="{Binding DataIndex}"
></i:InvokeCommandAction>
</i:EventTrigger>
<i:EventTrigger EventName="Unchecked">
<i:InvokeCommandAction
Command="{Binding DataContext.UnSelectedChangedCallback,RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}"
CommandParameter="{Binding DataIndex}"
></i:InvokeCommandAction>
</i:EventTrigger>
</i:Interaction.Triggers>
</CheckBox>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn Header="源数据表" Binding="{Binding SourceTableName}" IsReadOnly="True" Width="400"/>
<DataGridTextColumn Header="目标数据表" Binding="{Binding TargetTableName}" IsReadOnly="True" Width="400"/>
</DataGrid.Columns>
</DataGrid>
所有回答(1)
0
在WPF MVVM DataGrid中，滑动鼠标滚轮会触发checkbox的Unchecked事件的问题，可能是由于DataGrid的滚动机制导致的。可以尝试在DataGrid的ScrollViewer上添加PreviewMouseWheel事件，然后在事件处理程序中手动处理鼠标滚轮事件，避免事件冒泡到checkbox上。具体实现可以参考以下代码：
<DataGrid ScrollViewer.PreviewMouseWheel="DataGrid_PreviewMouseWheel" ...>
...
</DataGrid>
private void DataGrid_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
e.Handled = true;
var eventArg = new MouseWheelEventArgs(e.MouseDevice, e.Timestamp, e.Delta)
{
RoutedEvent = UIElement.MouseWheelEvent,
Source = sender
};
var parent = ((Control)sender).Parent as UIElement;
parent?.RaiseEvent(eventArg);
}
这样可以避免滚动事件冒泡到checkbox上，从而避免触发checkbox的Unchecked事件。
