从ViewModel类调用FFImageLoading的GetImageAsPngAsync？

Question

将https://github.com/luberda-molinet/FFImageLoading用于Xamarin表单

我的XAML：

 <forms:CachedImage
CacheType="All"
RetryDelay="1000"
DownsampleHeight="150"
RetryCount="5"
CacheDuration="1"
BackgroundColor="WhiteSmoke"
BitmapOptimizations="True"
SuccessCommand="{Binding CcCommand}"
Source = "{Binding Photo1}">

我的ViewModel类：

class AboutMeViewModel : INotifyPropertyChanged
{
    public ICommand CcCommand { get; set; }

    public AboutMeViewModel()
    {
        CcCommand = new Command<CachedImageEvents.SuccessEventArgs>(ffFinishLoading);
    }

    void ffFinishLoading(CachedImageEvents.SuccessEventArgs ea)
    {
       // Here I would like to call 'GetImageAsPngAsync'
    }

    public event PropertyChangedEventHandler PropertyChanged;
    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

在ffFinishLoading我想调用GetImageAsPngAsync，但我找不到在ViewModel类中执行此操作的方法，因为我没有选择参考表单：从XAML文件到ViewModel文件的CachedImage。

非常感谢任何帮助。

Answer 1

var stream = await ImageService.Instance.LoadUrl(Photo1).AsPNGStreamAsync();