C# wpf datagrid在DataGridTemplateColumn不工作的情况下单击编辑

我正在基于解析的csv文件动态创建datagrid列。本质上，我是在遵循这项技术，但是我使用了DataGridTemplateColumn，因为我需要指定一个组合作为编辑控件

我还想进行一次单击编辑，我遵循本文中建议的技术，她将她的组合包装在一个网格中，并使用FocusManager.FocusedElement设置焦点

我在ViewModel中执行此操作，创建combo元素的代码如下所示：

private static FrameworkElementFactory CreateComboElement(int columnIndex, List<string> fieldNameMappings)
{
    //note we create the combo in a grid and use the FocusManager to get focus on 1 click!

    //so first the grid
    FrameworkElementFactory gridElement = new FrameworkElementFactory(typeof(Grid));
    Binding gridBinding = new Binding();
    gridBinding.ElementName = "combo";
    gridElement.SetValue(System.Windows.Input.FocusManager.FocusedElementProperty, gridBinding);

    //now the combo
    FrameworkElementFactory cboElement = new FrameworkElementFactory(typeof(ComboBox));
    gridElement.AppendChild(cboElement);

    //set the ItemsSource on the combo
    Binding comboBinding = new Binding();
    comboBinding.Source = fieldNameMappings;
    cboElement.SetBinding(ComboBox.ItemsSourceProperty, comboBinding);
    cboElement.SetValue(ComboBox.NameProperty, "combo");
    cboElement.SetValue(ComboBox.IsSynchronizedWithCurrentItemProperty, false);

    //now set the binding for the selected vlaue in the combo
    Binding selectedBinding = new Binding(string.Format("Properties[{0}].Value", columnIndex));
    cboElement.SetBinding(ComboBox.SelectedItemProperty, selectedBinding);
    return gridElement;
}

---

有什么问题，为什么单击不起作用？

您必须截获DataGridCell的OnGotFocus事件，将单元格的模式设置为IsEditing，然后截获CellEditingTemplate中actor控件的加载事件：

在代码隐藏中，需要三个处理程序；一个用于单元格，一个用于每种类型的控件（组合框、文本框）：

//
///跳过“DataGridCell.Focus”步骤，直接进入iEdit
/// 
私有void DataGridCell_OnGotFocus（对象发送方，RoutedEventTarget e）
{
DataGridCell=发送方为DataGridCell；
cell.IsEditing=true；
}
/// 
///跳过“IsEdit”步骤，直接进入IsDropDownOpen
/// 
已加载私有无效组合框（对象发送方，路由目标）
{
ComboBox ComboBox=发件人作为ComboBox；
comboBox.IsDropDownOpen=true；
}
/// 
///跳过“iEdit”步骤，直接进入焦点
/// 
已加载私有无效文本框（对象发送方，路由目标）
{
TextBox TextBox=发送者作为TextBox；
textBox.Focus（）；
}

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=combo'. BindingExpression:(no path); DataItem=null; target element is 'Grid' (Name=''); target property is 'FocusedElement' (type 'IInputElement')

<Window.Resources>
    <Style
        x:Key="AutoEditModeOnClick"
        TargetType="{x:Type DataGridCell}">

        <EventSetter Event="GotFocus" Handler="DataGridCell_OnGotFocus" />
    </Style>
</Window.Resources>

<DataGrid.Columns>
    <DataGridTemplateColumn
        CellStyle="{StaticResource AutoEditModeOnClick}"
        Header="Score">

        <!-- Example with ComboBox -->

        <DataGridTemplateColumn.CellTemplate>
            <DataTemplate>
                <!-- Some more XAML -->
            </DataTemplate>
        </DataGridTemplateColumn.CellTemplate>

        <DataGridTemplateColumn.CellEditingTemplate>
            <DataTemplate>
                <!-- Some more XAML -->
                <ComboBox
                    DisplayMemberPath="Description"
                    SelectedValuePath="RecordID"
                    SelectedValue="{Binding Score,
                        TargetNullValue=0,
                        UpdateSourceTrigger=PropertyChanged}"
                    ItemsSource="{Binding DataContext.ScoreOptions,
                        RelativeSource={RelativeSource
                            AncestorType={x:Type DataGrid}}}"
                    Loaded="Combobox_Loaded"/>
            </DataTemplate>
        </DataGridTemplateColumn.CellEditingTemplate>
    </DataGridTemplateColumn>

    <DataGridTemplateColumn
        CellStyle="{StaticResource AutoEditModeOnClick}"
        Header="Comment">

        <!-- Example with TextBox -->

        <DataGridTemplateColumn.CellTemplate>
            <DataTemplate>
                <!-- Some more XAML -->
            </DataTemplate>
        </DataGridTemplateColumn.CellTemplate>

        <DataGridTemplateColumn.CellEditingTemplate>
            <DataTemplate>
                <!-- Some more XAML -->
                <TextBox
                    Loaded="TextBox_Loaded"
                    Text="{Binding Comment,
                        UpdateSourceTrigger=LostFocus}"/>
            </DataTemplate>
        </DataGridTemplateColumn.CellEditingTemplate>
    </DataGridTemplateColumn>
</DataGrid.Columns>

    /// <summary>
    /// Skips the 'DataGridCell.Focus' step and goes straight into IsEditing
    /// </summary>
    private void DataGridCell_OnGotFocus(object sender, RoutedEventArgs e)
    {
        DataGridCell cell = sender as DataGridCell;
        cell.IsEditing = true;
    }

    /// <summary>
    /// Skips the 'IsEditing' step and goes straight into IsDropDownOpen
    /// </summary>
    private void Combobox_Loaded(object sender, RoutedEventArgs e)
    {
        ComboBox comboBox = sender as ComboBox;
        comboBox.IsDropDownOpen = true;
    }

    /// <summary>
    /// Skips the 'IsEditing' step and goes straight into Focus
    /// </summary>
    private void TextBox_Loaded(object sender, RoutedEventArgs e)
    {
        TextBox textBox = sender as TextBox;
        textBox.Focus();
    }