silverlight – 如何仅使用XAML显示不同的枚举图标？

我想根据枚举值显示不同的图标/图像.例如,如果我有以下枚举：

public enum UploadStatus
  {
      UnkNown = 0,WaitingToUpload = 10,Uploading = 20,Uploaded = 30,UploadFailed = 40
  }

我想编写看起来像这样的XAML：

...

<EnumImage Value="{Binding Path=CurrentStatus}">
  <EnumImageItem Value="UnkNown"         Image="/images/unkNown.png" />
  <EnumImageItem Value="WaitingToUpload" Image="/images/clock.png" />
  <EnumImageItem Value="Uploading"       Image="/images/upload.png" />
  <EnumImageItem Value="Uploaded"        Image="/images/tick.png" />
  <EnumImageItem Value="UploadFailed"    Image="/images/error.png" />
</EnumImage>

...

我发现许多帖子都提示自定义IValueConverters,但这些解决方案不适合XAML范例.

任何指针或建议？

解决方法

这是一个值转换器,它维护“XAML范例”,即在XAML中维护枚举值和图像之间的关系.

[contentproperty("Items")]
public class EnumToObjectConverter : IValueConverter
{
    public ResourceDictionary Items { get; set; }

    public object Convert(object value,Type targettype,object parameter,System.Globalization.CultureInfo culture)
    {
        string key = Enum.GetName(value.GetType(),value);
        return Items[key];
    }

    public object ConvertBack(object value,System.Globalization.CultureInfo culture)
    {
        throw new NotImplementedException("This converter only works for one way binding");
    }
}

请注意,这是非常通用的,它实际上将任何枚举类型的值映射到任何仲裁对象.这是它在Xaml中的用法： –

<Grid.Resources>
  <local:EnumToObjectConverter x:Key="Icons">
    <ResourceDictionary>
 <BitmapImage x:Key="UnkNown" UriSource="/images/unkNown.png" />
      <BitmapImage x:Key="WaitingToUpload" UriSource="/images/clock.png" />        
      <BitmapImage x:Key="Uploading"       UriSource="/images/upload.png" />        
      <BitmapImage x:Key="Uploaded"        UriSource="/images/tick.png" />        
      <BitmapImage x:Key="UploadFailed"    UriSource="/images/error.png" />        
    </ResourceDictionary>
  </local:EnumToObjectConverter>
</Grid.Resources>

当枚举类型的绑定属性时,可以使用此转换器： –

<Image Source="{Binding Status,Converter={StaticResource Icons}}" />