c# - 编辑模式下的 DataGrid 单元格不接受 .(点)作为 WPF MVVM 中的十进制值

Question

我有一个 DataGrid，其列绑定(bind)到 ViewModel Decimal 属性。

当从 ViewModel 添加值时显示十进制值，但当我编辑同一个单元格并删除内容然后添加时，该单元格不接受 。句点。那么我该如何编辑单元格。

<DataGrid Name="dgSales" Height="300" Margin="0,3,0,0" IsSynchronizedWithCurrentItem="True" SelectedItem="{Binding SelectedItem,Converter={StaticResource ignoreNewItemPlaceHolderConverter}}" ItemsSource="{Binding StockList,UpdateSourceTrigger=PropertyChanged}" ToolTip="{Binding RelativeSource={RelativeSource Self},Path=(Validation.Errors)[0].ErrorContent}" GotKeyboardFocus="dgSales_GotKeyboardFocus" CurrentCellChanged="dgSales_CurrentCellChanged">
    <DataGrid.Columns>
        <DataGridTextColumn Header="S No." Width="SizeToCells" MinWidth="60" Binding="{Binding SNo}" IsReadOnly="True" />
        <DataGridTemplateColumn Header="Stock Name" Width="280">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                <TextBlock Text="{Binding StockName}"/>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
            <DataGridTemplateColumn.CellEditingTemplate>
                <DataTemplate>
                    <ComboBox Width="280" Name="cmbStock" ItemsSource="{Binding Path=Stocks}" FocusManager.FocusedElement="{Binding RelativeSource={RelativeSource Self}}" ></ComboBox>
                </DataTemplate>
            </DataGridTemplateColumn.CellEditingTemplate>
        </DataGridTemplateColumn>
        <DataGridTextColumn Header="Unit Price" Width="SizeToCells" MinWidth="80" Binding="{Binding UnitPrice,UpdateSourceTrigger=PropertyChanged}" />
        <DataGridTextColumn Header="Unit" Width="SizeToCells" MinWidth="80" Binding="{Binding Unit}" IsReadOnly="True"/>
    <DataGridTextColumn Header="Quantity" Width="SizeToCells" MinWidth="80" Binding="{Binding Quantity,UpdateSourceTrigger=PropertyChanged}" />
        <DataGridTextColumn Header="Discount" Width="SizeToCells" MinWidth="80" Binding="{Binding Discount,UpdateSourceTrigger=PropertyChanged}"/>
        <DataGridTextColumn Header="Amount" Width="SizeToCells" MinWidth="100" Binding="{Binding Amount,StringFormat=\{0:n2\}}" IsReadOnly="True" />
    </DataGrid.Columns>
</DataGrid>                

Answer 1

问题可能是您使用的 UpdateSourceTrigger=PropertyChanged 会在每次击键时重新评估文本，并且以小数点结尾的数字无效。尝试删除 UpdateSourceTrigger 设置(因此恢复为默认设置 - LostFocus)