我有一个WPF数据网格，如下面的代码所示。网格的“交易”列有一个下拉列表。用户单击单元格时，它会选择该单元格。然后，他们必须再次单击该单元格，才能进入单元格编辑模式并显示下拉菜单。然后，他们必须第三次单击该单元格才能查看下拉列表。
我想知道是否有人可以向我展示如何在第一次单击而不是单击3次的情况下下拉组合列表，或者使我指出要实现此目的我应该做的事情。预先感谢。
<DataGrid SelectionMode="Single" Grid.Row="0" Name="grd_S_TML" CanUserAddRows="False" TabIndex="41" MinHeight="{Binding Grd_S_TMLHeight}" ItemsSource="{Binding GrdSTmlCollection}" SelectedIndex="{Binding GrdSTmlSelectedIndex}" SelectedItem="{Binding GrdSTmlSelectedItem, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" AutoGenerateColumns="false"
behaviors:DragManagerExtended.DragOverCommand="{Binding GrdStmlDragOverCommand}" behaviors:DragManagerExtended.DragDropCommand="{Binding GrdStmlDragDropCommand}" behaviors:DragManagerExtended.IsDropTarget="True" ContextMenu="{StaticResource mnuMGridPopUp}" CellStyle="{StaticResource OverrideGridCellHighlight}"
behaviors:DragManagerExtended.IsNeedToBeDisposed="{Binding IsFormClosed}">
<DataGrid.Columns>
<DataGridTextColumn Header="ID" Binding="{Binding SequenceNo}" Width="0" Visibility="Collapsed" IsReadOnly="True" />
<DataGridTextColumn Header="Status" Binding="{Binding RowStatus}" Width="0" Visibility="Collapsed" IsReadOnly="True" />
<DataGridTemplateColumn Header="Trade" Width="201">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock HorizontalAlignment="Left" Text="{Binding Path=TradeSelectedItem.Text}"/>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<ComboBox x:Name="cboTrades" ItemsSource="{Binding TradeCollection}" DisplayMemberPath="Text" SelectedValuePath="ID" SelectedItem="{Binding TradeSelectedItem, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
<i:Interaction.Triggers>
<behaviors:KeyPressedBehavior>
<i:InvokeCommandAction Command="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Window},Path=DataContext.RoleComboBoxKeyPressEvent}" />
</behaviors:KeyPressedBehavior>
</i:Interaction.Triggers>
</ComboBox>
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="Pay Rate" Width="60">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding PayRate, StringFormat={}{0:0.00}}" Style="{StaticResource TextBlockCenterAlligned}" TextAlignment="Right" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<TextBox Text="{Binding Path=PayRate, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" MaxLength="6" TextAlignment="Right" HorizontalContentAlignment="Right" />
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>
<DataGridTemplateColumn Header="Qty" Width="60">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Text="{Binding Quantity, StringFormat={}{0:0.00}}" Style="{StaticResource TextBlockCenterAlligned}" TextAlignment="Right" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
<DataGridTemplateColumn.CellEditingTemplate>
<DataTemplate>
<TextBox Text="{Binding Path=Quantity, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" MaxLength="6" TextAlignment="Right" HorizontalContentAlignment="Right" />
</DataTemplate>
</DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn Header="Rate (p/hr)" Binding="{Binding Path=RateHR, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, StringFormat={}{0:0.00}}" Width="60" IsReadOnly="True" ElementStyle="{StaticResource RightAlignDataGridTextColumnStyle}" />
<DataGridTextColumn Header="Value (£)" Binding="{Binding ItemValue, StringFormat={}{0:0.00}}" Width="60" IsReadOnly="True" ElementStyle="{StaticResource RightAlignDataGridTextColumnStyle}" />
</DataGrid.Columns>
<i:Interaction.Behaviors>
<behaviors:DataGridColumnIndexAndCellPositionBehavior ColumnIndex="{Binding Source={StaticResource vmOrderPricing},Path=StmlColumnIndex,Mode=TwoWay}" />
<behaviors:DataGridRowClickBehavior RowClickCommand="{Binding GrdStmlMouseDownCommand}" />
<behaviors:DataGridCellEditEndingBehavior CellEditEndingCommand="{Binding GrdStmlAfterColUpdateCommand}" />
<behaviors:DataGridBeginningEditBehavior BeginningEditCommand="{Binding GrdStmlBeforeColEditCommand}" />
</i:Interaction.Behaviors>
<i:Interaction.Triggers>
<i:EventTrigger EventName="LostFocus">
<i:InvokeCommandAction Command="{Binding GrdStmlLostFocusCommand}" />
</i:EventTrigger>
<behaviors:KeyPressedBehavior>
<i:InvokeCommandAction Command="{Binding GrdStmlKeyPressCommand}" />
</behaviors:KeyPressedBehavior>
<i:EventTrigger EventName="SelectionChanged">
<i:InvokeCommandAction Command="{Binding GrdStmlRowColChangeCommand}" />
</i:EventTrigger>
</i:Interaction.Triggers>
<DataGrid.RowStyle>
<Style TargetType="DataGridRow">
<Style.Triggers>
<MultiDataTrigger>
<MultiDataTrigger.Conditions>
<Condition Binding="{Binding RowStatus}" Value="Edit"></Condition>
<Condition Binding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=Window}, Path=DataContext.LoadSalesOnly}" Value="false"></Condition>
</MultiDataTrigger.Conditions>
<Setter Property="Background" Value="{StaticResource ROW_STYLE_HIGHLIGHT_CHANGE}" />
</MultiDataTrigger>
<MultiDataTrigger>
<MultiDataTrigger.Conditions>
<Condition Binding="{Binding RowStatus}" Value="Add"></Condition>
<Condition Binding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=Window}, Path=DataContext.LoadSalesOnly}" Value="false"></Condition>
</MultiDataTrigger.Conditions>
<Setter Property="Background" Value="{StaticResource ROW_STYLE_HIGHLIGHT_NEW}" />
</MultiDataTrigger>
<MultiDataTrigger>
<MultiDataTrigger.Conditions>
<Condition Binding="{Binding RowStatus}" Value="Delete"></Condition>
<Condition Binding="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=Window}, Path=DataContext.LoadSalesOnly}" Value="false"></Condition>
</MultiDataTrigger.Conditions>
<Setter Property="Background" Value="{StaticResource ROW_STYLE_HIGHLIGHT_DELETE}" />
</MultiDataTrigger>
<DataTrigger Binding="{Binding RowStatus}" Value="View">
</DataTrigger>
</Style.Triggers>
</Style>
</DataGrid.RowStyle>
确定，我已经解决了。以为我会把它贴在这里给其他可能偶然发现这个问题的人。
我在以下依赖项属性上创建了一个行为。
public static readonly DependencyProperty IsAllowSingleClickEditProperty = DependencyProperty.RegisterAttached("IsAllowSingleClickEdit", typeof(bool), typeof(DataGridCellSingleClickEditDependency), new PropertyMetadata(false, IsAllowSingleClickEditChanged));
...在行为上，我将此事件链接到此方法...
private static void IsAllowSingleClickEditChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
DataGridCell dataGridCell = sender as DataGridCell;
if (dataGridCell != null)
{
if (e.NewValue.Equals(true))
{
dataGridCell.GotFocus += DataGridCellGotFocusHandler;
}
else
{
dataGridCell.GotFocus -= DataGridCellGotFocusHandler;
}
}
}
...，最后是DataGridCellGotFocusHandler ...]中的代码
DataGridCell cell = sender as DataGridCell;
if (cell != null && !cell.IsEditing && !cell.IsReadOnly)
{
if (!cell.IsFocused)
{
cell.Focus();
}
DataGrid dataGrid = FindVisualParent<DataGrid>(cell);
if (dataGrid != null)
{
dataGrid.BeginEdit(e);
if (dataGrid.SelectionUnit != DataGridSelectionUnit.FullRow)
{
if (!cell.IsSelected)
{
cell.IsSelected = true;
}
}
else
{
DataGridRow row = FindVisualParent<DataGridRow>(cell);
if (row != null && !row.IsSelected)
{
row.IsSelected = true;
}
}
Control control = GetFirstChildByType<Control>(e.OriginalSource as DataGridCell);
if (control != null)
{
control.Focus();
TextBox txt = control as TextBox;
if (txt != null)
{
txt.Select(0,txt.Text.Length);
}
}
}
}