"Two-way binding requires Path or XPath" 尝试编辑 DataGrid 列时

Question

我有一个 DataGrid，我在其中一个列中执行 MultiBinding。只是一些背景知识——我有一个控件 (AngleSelectionControl)，用户可以选择要在数据网格中显示的单位（度或弧度）。使用下面的代码，Roll2 列显示存储在模型中的值（度）。滚动列显示给定所选单位（度或弧度）的正确值。一切正常。我还可以更改 Roll2 列值，Roll 列会更新并以选定的单位显示。但是，当我尝试编辑 Roll 列（在单元格中双击）时，调试器显示异常 "Two-way binding requires Path or XPath"。我错过了什么？

<DataGrid Name="StationConfigurationsDataGrid" Grid.Column="1" Height="150" Width="420" CanUserAddRows="True" AutoGenerateColumns="False" Grid.ColumnSpan="2" ItemsSource="{Binding Path=StationConfigurations}" SelectionMode="Single"  SelectedItem="{Binding SelectedConfiguration}" ScrollViewer.CanContentScroll="True" ScrollViewer.VerticalScrollBarVisibility="Auto" ScrollViewer.HorizontalScrollBarVisibility="Auto">
    <DataGrid.Columns>
    <DataGridTextColumn MinWidth="100" Width="Auto" Header="Roll">
        <DataGridTextColumn.Binding>
        <MultiBinding Converter="{StaticResource AngleMultiValueConverter}" ValidatesOnExceptions="True" StringFormat="f" Mode="TwoWay">
            <Binding Path="Roll" FallbackValue="-99.99"/>
            <Binding Source="{x:Static unitTypes:AngleSelectionType.Degrees}"/>
            <Binding ElementName="AngleSelectionControl" Path="DisplayValueType"/>
            <Binding ElementName="AngleSelectionControl" Path="ValueFormat"/>
        </MultiBinding>
        </DataGridTextColumn.Binding>
    </DataGridTextColumn>
    <DataGridTextColumn MinWidth="100" Width="Auto" Header="Roll2" Binding="{Binding Roll, ValidatesOnExceptions=True, StringFormat=f}"></DataGridTextColumn>
    </DataGrid.Columns>
</DataGrid>

Answer 1

尝试将第二个绑定的 Path 属性设置为 '.':

<Binding Path="." Source="{x:Static unitTypes:AngleSelectionType.Degrees}"/>

"Two-way binding requires Path or XPath" 尝试编辑 DataGrid 列时

"Two-way binding requires Path or XPath" when attempting edit a DataGrid column

c#

wpf

datagrid

multibinding