net10.0 
namespace System.Web
{
    [DefaultMember("Item")]
    public class HttpSessionStateWrapper : HttpSessionStateBase
    {
        public override void Add(string! name, object! value);
    }
}
nuget.org
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Reference this API
.NET
8.09.010.0
.NET Framework
3.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
Information specific to net10.0
Assembly

Microsoft.AspNetCore.SystemWebAdapters , Version=2.2.1.0, PublicKeyToken=adb9793829ddae60

Referencing

Your project needs a package reference to Microsoft.AspNetCore.SystemWebAdapters.

Package Microsoft.AspNetCore.SystemWebAdapters (2.2.1) net10.0
Platform Restrictions

This API is supported on all platforms.

  • Built-in API
  • Package-provided API