1
我有一个DataGrid
多列,我在其中一列使用MultiBinding
绑定到MultiValueConverter
,但没有显示在该列中。我不确定我做错了什么。对于DataGrid
,MfrSelection
的ItemSource
不包含对应于VolumeToPercentConverter
的对象。这是什么搞乱了绑定?MultiBinding转换器不绑定到DataTemplate中的TextBlock
下面是相关的XAML
<Window.Resources>
<local:VolumeToPercentConverter x:Key="VolumeToPercentConverter"/>
</Window.Resources>
...
<DataGrid x:Name="_mfrSelectionGrid" Grid.ColumnSpan="2" Grid.Row="2" ItemsSource="{Binding MfrSelection}" Margin="5,0" AutoGenerateColumns="False">
...
<DataGridTemplateColumn x:Name="_PercentChange" IsReadOnly="True" Visibility="Visible" Header="Percent Change">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<TextBlock Margin="3,0" VerticalAlignment="Center">
<TextBlock.Text>
<MultiBinding Converter="{StaticResource VolumeToPercentConverter}">
<Binding Path="YearVolume"/>
<Binding Path="LastYearVolume"/>
</MultiBinding>
</TextBlock.Text>
</TextBlock>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
而且在我的代码转换器背后:
public class VolumeToPercentConverter : IMultiValueConverter
{
public object Convert(object[] value, Type targetType, object parameter, CultureInfo culture)
{
decimal percent = 0;
if (value[0] is decimal && value[1] is decimal)
{
if ((decimal)value[1] != 0 && (decimal)value[0] != 0)
{
percent = ((decimal)value[0] - (decimal)value[1])/(decimal)value[1];
return percent;
}
else
{
return percent;
}
}
else
{
return percent;
}
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, CultureInfo culture)
{
return null;
}
}
有什么问题?是否将值传递给转换器null? – 2014-09-03 17:50:02