public override object?Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value is Guid imageid)
{
if (Guid.Empty == imageid)
{
return(null);
}
return(ImageUrlHelper.GetImageApiUrlById(imageid));
}
return(value);
}
public override object?Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value == null)
{
return(null);
}
int width = 0;
if (parameter is int w)
{
width = w;
}
if (value is string rawUri)
{
if (rawUri == string.Empty)
{
return(null);
}
Uri uri;
// Allow for assembly overrides
if (File.Exists(rawUri))
{
return(GetDecodeBitmap(rawUri, width));
}
//在列表中使用此方法性能极差
else if (rawUri.StartsWith("http://") || rawUri.StartsWith("https://"))
{
return(DownloadImage(rawUri, width));
}
else if (rawUri.StartsWith("avares://"))
{
uri = new Uri(rawUri);
}
else
{
uri = GetResUri(rawUri);
}
var asset = OpenAssets(uri);
return(GetDecodeBitmap(asset, width));
}
else if (value is Stream s)
{
TryReset(s);
return(GetDecodeBitmap(s, width));
}
else if (value is ImageSouce.ClipStream clipStream)
{
return(GetBitmap(clipStream));
}
else if (value is Guid imageid)
{
if (Guid.Empty == imageid)
{
return(null);
}
return(DownloadImage(ImageUrlHelper.GetImageApiUrlById(imageid), width));
}
return(BindingOperations.DoNothing);
}