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);
}
protected void AdjustColumns()
{
if (!options.NeedsRunTimeTypeCheck)
{
return;
}
var typeInfos = tag.For.Metadata.ModelType.GetTypeInfo();
foreach (var row in options.Rows)
{
foreach (var col in row.VisibleAndHiddenColumns)
{
if (col.AdditionalPrefix != null)
{
continue;
}
if (col.For != null && typeInfos.GetProperty(col.For.Metadata.PropertyName) == null)
{
col.AdditionalPrefix = DerivedClassesRegister.GetCodeFromType(row.For.Metadata.ModelType);
}
else
{
col.AdditionalPrefix = string.Empty;
}
}
}
}
public override JsonContract ResolveContract(Type type)
{
var res = base.ResolveContract(type);
if (res.Converter == null)
{
if (DerivedClassesRegister.GetCodeFromType(type, true) != null)
{
res.Converter = new RuntimeTypesJsonConverter();
}
}
return(res);
}
public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
{
var t = JToken.FromObject(value);
if (value != null && t.Type == JTokenType.Object)
{
var code = DerivedClassesRegister.GetCodeFromType(value.GetType());
if (code != null)
{
(t as JObject).AddFirst(new JProperty("$type", code));
}
}
t.WriteTo(writer);
}