Question

我有DataGrid绑定到ObservableCollection<Client>。我有一个UserControl负责从Textbox值对集合应用过滤器，如下所示：

private void UCFilterBox_SearchTextChanged(object sender, string e)
{
    var coll = CollectionViewSource.GetDefaultView(dgClients.ItemsSource);
    coll.Filter = o =>
    {
        var c = o as Client;
        if (c != null)
        {
            bool ret =  (the filter...)

            return ret;
        }
        else
        {
            return false;
        }
    };
}

然后我有一个TextBlock，它绑定到DataGrid的{{1}}集合，如下所示：

Items

此操作正常，每次过滤<StackPanel Grid.Row="0" Margin="215,0,0,5" HorizontalAlignment="Left" VerticalAlignment="Bottom" Orientation="Horizontal"> <TextBlock Style="{StaticResource SmallTextBlockStyle}" Text="{Binding ElementName=dgClients, Path=Items.Count}" /> <TextBlock Style="{StaticResource SmallTextBlockStyle}" Text="{Binding ElementName=dgClients, Path=Items.Count, Converter={StaticResource ClientSingleOrPluralConverter}, StringFormat={} {0}}" /> </StackPanel>时，值都会相应更改。

但是，我有另一个DataGrid绑定到TextBlock的{{1}}集合，它负责显示所显示数据的总和，而且这个数据不会更新！< / p>

DataGrid

Items仅在<TextBlock Margin="5" FontWeight="Bold" Text="{Binding ElementName=dgClients, Path=Items, Converter={StaticResource CalculateSumConvertor}, StringFormat={}{0:C}}" />的绑定时被点击一次，然后不再被点击。

这是转换器：

CalculateSumConvertor

我在这里做错了吗？

Answer 1

将绑定更改为以下内容并将转换器更改为IMultiValueConverter

    <TextBlock Margin="5"
       FontWeight="Bold">
        <TextBlock.Text>
            <MultiBinding Converter="{StaticResource CalculateSumConvertor}" StringFormat="{}{0:C}">
                <Binding ElementName="dgClients" Path="Items" />
                <Binding ElementName="dgClients" Path="Items.Count" />
            </MultiBinding>
        </TextBlock.Text>
    </TextBlock>

转换器：

class CalculateSumConvertor : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        var clients = values[0] as ItemCollection;
        ...
    }




}

DataGrid Items集合并不总是刷新

1 个答案: