net6.0-windows 
namespace System.Collections.Specialized
{
    public abstract class NameObjectCollectionBase : ICollection, IEnumerable, IDeserializationCallback, ISerializable
    {
        [Obsolete("Please use NameObjectCollectionBase(IEqualityComparer) instead.")]
        protected NameObjectCollectionBase(IHashCodeProvider hashProvider, IComparer comparer);
    }
}
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Reference this API
.NET
5.06.07.08.09.010.011.0
.NET Core
2.02.12.23.03.1
.NET Framework
1.01.12.03.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard
2.02.1
Information specific to net6.0
Assembly

System.Collections.Specialized , Version=4.1.1.0, PublicKeyToken=b03f5f7f11d50a3a

Referencing

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

Package Microsoft.AspNetCore.App (3.0.0-preview3-19153-02) netcoreapp3.0
Obsolete Please use NameObjectCollectionBase(IEqualityComparer) instead.
Platform Restrictions

This API is supported on all platforms.

  • Built-in API
  • Package-provided API