public TagHelpersProviderContext(ITagHelpersProvider provider, ViewContext context)
{
this.provider = provider;
this.context = context;
oldProviderContext = context.ViewData[field] as TagHelpersProviderContext ??
new TagHelpersProviderContext(context.HttpContext.RequestServices.GetService <DefaultTagHelpersProvider>());
if (oldProviderContext == provider)
{
return;
}
oldProviderContext.provider.UnPrepareViewContext(context);
context.ViewData[field] = this;
context.ClientValidationEnabled = provider.RequireUnobtrusiveValidation;
provider.PrepareViewContext(context);
}
