net47 
namespace System.Web
{
    [DefaultMember("Item")]
    [TypeForwardedFrom("System.Web.Abstractions, Version=3.5.0.0, Culture=Neutral, PublicKeyToken=31bf3856ad364e35")]
    public class HttpApplicationStateWrapper : HttpApplicationStateBase
    {
        public override string[] AllKeys { get; }
    }
}
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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 3.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.02.1
Information specific to net47
Assembly

System.Web , Version=4.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

Referencing

Your project needs an assembly reference to System.Web.

Platform Restrictions

This framework does not have platform annotations.

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  • Package-provided API