xamarinmac 
namespace Microsoft.AspNetCore.Mvc.ViewFeatures
{
    public class DefaultHtmlGenerator : Object, IHtmlGenerator
    {
        public IHtmlContent GenerateGroupsAndOptions(? optionLabel, IEnumerable<SelectListItem> selectList);
    }
}
nuget.org
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Reference this API
.NET
5.06.07.08.09.010.0
.NET Core
2.02.12.23.03.1
.NET Framework
4.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard
2.02.1
Information specific to xamarinmac
Assembly

Microsoft.AspNetCore.Mvc.ViewFeatures , Version=2.3.0.0, PublicKeyToken=adb9793829ddae60

Referencing

Your project needs a package reference to Microsoft.AspNetCore.Mvc.ViewFeatures.

Package Microsoft.AspNetCore.Mvc.ViewFeatures (2.3.0) netstandard2.0
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API