我对WPF相对较新，并且正在尝试更改绑定值为十进制零的某些网格单元格。目的是将单元格为0的单元格留空。例如，如果TranDeposit列为零，我想将其更改为空白。在ASP.NET中，这可以通过使用DataBound事件来实现。XAML代码如下：
<DataGrid x:Name="transactionsDataGrid" Grid.Row="3" AutoGenerateColumns="False" EnableRowVirtualization="True"
ItemsSource="{Binding}" RowDetailsVisibilityMode="VisibleWhenSelected" RowHeaderWidth="0" Padding="10,0,0,0"
AlternatingRowBackground="#FF888888" GridLinesVisibility="Horizontal" SelectionUnit="FullRow" RowBackground="#FFCCCCCC" VerticalAlignment="Top" SelectedIndex="0"
HeadersVisibility="Column" Background="#FF292929" Height="355" SelectionChanged="TransactionsDataGrid_SelectionChanged" CanUserAddRows="false" Margin="5,0,5,0"
Loaded="DataGrid_RowLoaded">
<DataGrid.Columns>
<DataGridTextColumn x:Name="tranDateColumn" Binding="{Binding TranDate, StringFormat=MM/dd/yyyy}" Header="Date" Width="90" IsReadOnly="True"/>
<DataGridTextColumn x:Name="tranDescriptionColumn" Binding="{Binding TranDescription}" Header="Description" Width="*" IsReadOnly="True"/>
<DataGridTextColumn x:Name="tranCategoryColumn" Binding="{Binding TranCategory}" Header="Category" Width="340" IsReadOnly="True">
<DataGridTextColumn.ElementStyle>
<Style TargetType="TextBlock">
<!--<Setter Property="HorizontalAlignment" Value="Right" />-->
<Setter Property="ToolTip" Value="{Binding Path=TranCategory}"/>
</Style>
</DataGridTextColumn.ElementStyle>
</DataGridTextColumn>
<DataGridTextColumn x:Name="tranNotesColumn" Binding="{Binding TranNotes}" Header="Notes" Width="120" IsReadOnly="True"/>
<DataGridCheckBoxColumn x:Name="tranTaxColumn" Binding="{Binding TranTax}" Header="Tax" Width="SizeToHeader" IsReadOnly="True"/>
<DataGridCheckBoxColumn x:Name="tranClearedColumn" Binding="{Binding TranCleared}" Header="Cleared" Width="SizeToHeader" IsReadOnly="True" />
<DataGridTextColumn x:Name="tranDepositColumn" Binding="{Binding TranDeposit}" Header="Deposit" Width="80" IsReadOnly="True"/>
<DataGridTextColumn x:Name="tranWithdrawlColumn" Binding="{Binding TranWithdrawl}" Header="Withdrawal" Width="80" IsReadOnly="True" />
<DataGridTextColumn x:Name="tranBalanceColumn" Binding="{Binding TranBalance}" Header="Balance" Width="80" IsReadOnly="True"/>
</DataGrid.Columns>
</DataGrid>
如您所见，我尝试使用Loaded事件访问该行，但是，没有可用于此事件动态更改的行。我已经尝试了LoadingRow事件，但是，当尝试使用非常流行的数据网格帮助程序扩展“ DataGridHelper”时，我在行的GetCell方法中得到了NullReferenceException：
presenter = GetVisualChild<DataGridCellsPresenter>(row);
行值是正确的，但演示者值是null。
public static DataGridCell GetCell(this DataGrid grid, DataGridRow row, int column)
{
if (row != null)
{
DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(row);
if (presenter == null)
{
grid.ScrollIntoView(row, grid.Columns[column]);
presenter = GetVisualChild<DataGridCellsPresenter>(row);
}
DataGridCell cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(column);
return cell;
}
return null;
}
目前还不确定要去哪里，并在网上搜索了答案。我真的很感谢您的帮助
使用值转换器，类似于以下内容：
public class ZeroToBlank: IValueConverter
{
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (value is int && (int)value == 0)
return string.Empty;
return value;
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (string.IsNullOrEmpty(value))
return 0;
return value;
}
}
您需要在XAML中添加对名称空间的引用：
xmlns:converters="YourNamespace.Converters"
然后添加为资源：
<UserControl.Resources>
<converters:ZeroToBlankConverter x:Key="ZeroToBlankConverter" />
</UserControl.Resources>
最后是绑定：
Binding="{Binding TranDeposit, Converter={StaticResource ZeroToBlankConverter}}"
本文收集自互联网，转载请注明来源。
如有侵权，请联系[email protected] 删除。
我来说两句