Question

我希望能够在我的代码中使用查找表（列表）将整数转换为字符串。整数和列表都从COM传递并绑定到我的代码中的observable。

<ListView Name="IdList" MaxWidth="310" Height="190" Margin="5" SelectionMode="Single" 
          ItemsSource="{Binding Path=TypeItem.Ids}">'

<GridViewColumn Width="Auto" 
                DisplayMemberBinding="{Binding Path=ShipType, 
                    Converter={StaticResource ShipTypeConverter}, 
                    ConverterParameter={x:Static vm:ConfigStaticItem.alternatives_shiptype}}"/>`

我尝试过使用multibinding，但只获得了DependencyProperty.UnsetValue作为列表值

<GridViewColumn Width="Auto">
  <GridViewColumnHeader Content="ShipType"/>
  <GridViewColumn.DisplayMemberBinding >
    <MultiBinding Converter="{StaticResource ShipTypeMultiConverter}">
      <Binding Path="ShipType"/>
      <Binding Path="ConfigStaticItem.alternatives_shiptype"/>
    </MultiBinding>
  </GridViewColumn.DisplayMemberBinding>
</GridViewColumn>

[ValueConversion(typeof(byte), typeof(string))]
public class ShipTypeMultiConverter : IMultiValueConverter
{
    public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
    {
        try
        {
            byte state = (byte)values[0];
            List<StaticId> list = (List<StaticId>)values[1];
            return state.ToString();
        }

        catch
        {
            return "";
        }
    }

还尝试使用模板，但我想我在XAML中迷路了:)。

vm是对我的ViewModel的引用 TypeItem.Ids定义为List，其中Static是一个可观察的类，其中包含ShipType值

有人有任何建议如何解决这个问题吗？enter code here

Answer 1

解决方案是：

将资源添加到资源字典

<CollectionViewSource
    x:Key="ShipTypeSource"
    Source="{Binding ConfigStaticItem.alternatives_shiptype}"
    />

使用标准绑定与静态资源作为转换器参数

<GridViewColumn
    Width="Auto"
    Header="Ship Type"
    DisplayMemberBinding="{Binding Path=ShipType, Converter={StaticResource ShipTypeConverter},
    ConverterParameter={StaticResource ShipTypeSource}}"
    />

使用单值转换器

[ValueConversion(typeof(byte), typeof(string))]
public class ShipTypeConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        try
        {
            Alternatives ShipTypes = (Alternatives)((parameter as CollectionViewSource).Source);
            byte Type = (byte)value;
            foreach (var key in ShipTypes)
            {
                if ((uint)Type == key.Key)
                {
                    return key.Value;
                }
            }
            return ""; // Ship type is undefined
        }

        catch
        {
            return "";
        }
    }

    public object ConvertBack(object value, Type targetType,
        object parameter, CultureInfo culture)
    {
        return null;
    }
}

使用列表＆lt;＆gt;作为gridview中的converterparameter

1 个答案: