Image Converter无法在Xamarin.Forms中使用

Question

Im using the converter to change the image but image is not loading here can somebody please help me here what I'm done wrong? I had checked the converter by debugging it is not getting hit.

Converter Code:

public class DownloadIconConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        return ((bool)value) ? "progressicon.png" : "cloud_download.png";
    }

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

In Xaml

  <ContentPage.Resources>
    <converter:DownloadIconConverter x:Key="downloadiconconverter" />
</ContentPage.Resources>

  <ImageButton
                                HeightRequest="40"  
                                    IsVisible="True"

                                Source="{Binding DownloadIcon,Converter={StaticResource downloadiconconverter}}"
                                WidthRequest="35" Command ="{Binding BindingContext.Download, Source={x:Reference listview}}" CommandParameter="{Binding .}" />

In Code behind file

    public bool DownloadIcon
    {
        get { return downloadicon; }
        set { SetProperty(ref downloadicon, value); }
    }

Answer 1

The Binding in my knowledge is not working because the boolean is in the ViewModel and not accessible to the listview data template

Try using this:

 Source="{Binding BindingContext.DownloadIcon, Converter={StaticResource downloadiconconverter},Source={x:Reference listview}}"