public override void Process(TagHelperContext context, TagHelperOutput output)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (output == null)
{
throw new ArgumentNullException(nameof(output));
}
output.CopyHtmlAttribute(SrcAttributeName, context);
ProcessUrlAttribute(SrcAttributeName, output);
var bareUrl = Src.Substring(0, Src.LastIndexOf('.'));
if (AppendVersion)
{
EnsureFileVersionProvider();
}
foreach (var format in SourceFormats)
{
var formatUrl = $"{bareUrl}.{format}";
var finalUrl = AppendVersion
? FileVersionProvider.AddFileVersionToPath(ViewContext.HttpContext.Request.PathBase, formatUrl)
: formatUrl;
output.Content.AppendHtml($@"<source type=""image/{format}"" srcset=""{finalUrl}"" />");
}
var url = AppendVersion
? FileVersionProvider.AddFileVersionToPath(ViewContext.HttpContext.Request.PathBase, Src)
: Src;
output.Content.AppendHtml(!Eager
? $@"<img src=""{url}"" alt=""{Alt}"" width=""{Width}"" height=""{Height}"">"
: $@"<img src=""{url}"" alt=""{Alt}"" width=""{Width}"" height=""{Height}"" loading=""lazy"">");
output.Attributes.Clear();
}