public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
if (SubClassType == null)
{
throw new ArgumentNullException(SubClassTypeName);
}
if (!For.Metadata.ModelType.GetTypeInfo().IsAssignableFrom(SubClassType))
{
throw new ArgumentException(string.Format(DefaultMessages.NotASubclass, SubClassType.Name, For.Metadata.ModelType.Name), SubClassTypeName);
}
if (For.Model != null && !SubClassType.GetTypeInfo().IsAssignableFrom(For.Model.GetType()))
{
output.TagName = string.Empty;
output.Content.SetHtmlContent(string.Empty);
return;
}
var prefix = DerivedClassesRegister.GetCodeFromType(SubClassType);
prefix = combinePrefixes(For.Name, prefix);
output.TagName = string.Empty;
string childContent;
using (var scope = new RenderingScope(For.Model, ViewContext.ViewData.GetFullHtmlFieldName(prefix), ViewContext.ViewData))
{
childContent = output.Content.IsModified ? output.Content.GetContent() :
(await output.GetChildContentAsync()).GetContent();
}
output.Content.SetHtmlContent(childContent);
}
public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
if (Transformation == null)
{
throw new ArgumentNullException(TransformationName);
}
Transformation.Context = ViewContext.HttpContext;
var type = Transformation.GetType();
var pres = type.GetMethod("Transform").Invoke(Transformation, new object[] { For.Model });
var prefix = TransformationsRegister.GetPrefix(type);
prefix = combinePrefixes(For.Name, prefix);
output.TagName = string.Empty;
string childContent;
if (string.IsNullOrWhiteSpace(UsePartial))
{
using (var scope = new RenderingScope(pres, ViewContext.ViewData.GetFullHtmlFieldName(prefix), ViewContext.ViewData))
{
childContent = output.Content.IsModified ? output.Content.GetContent() :
(await output.GetChildContentAsync()).GetContent();
}
}
else
{
var sw = new StringWriter();
var prov = ViewContext.HttpContext.RequestServices.GetRequiredService <IModelMetadataProvider>();
var dict = new ViewDataDictionary(prov, ViewContext.ViewData.ModelState);
dict.Model = pres;
dict.TemplateInfo.HtmlFieldPrefix = ViewContext.ViewData.GetFullHtmlFieldName(prefix);
dict[TagHelpersProviderContext.Field] = ViewContext.ViewData[TagHelpersProviderContext.Field];
var newContext = new ViewContext(ViewContext, ViewContext.View, dict, ViewContext.TempData, sw,
new HtmlHelperOptions {
Html5DateRenderingMode = ViewContext.Html5DateRenderingMode,
ClientValidationEnabled = ViewContext.ClientValidationEnabled,
ValidationMessageElement = ViewContext.ValidationMessageElement,
ValidationSummaryMessageElement = ViewContext.ValidationSummaryMessageElement
});
childContent = await newContext.RenderPartialView(UsePartial);
}
output.Content.SetHtmlContent(childContent);
}
