xamarinmac 
namespace System.Data.Entity.Core.EntityClient
{
    public class EntityConnection : DbConnection
    {
        public override void Open();
    }
}
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Reference this API
.NET 5.06.07.08.09.010.0
.NET Core 3.03.1
.NET Framework 4.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.1
Information specific to xamarinmac
Assembly

EntityFramework , Version=6.0.0.0, PublicKeyToken=b77a5c561934e089

Referencing

Your project needs a package reference to EntityFramework.

Package EntityFramework (6.5.1) netstandard2.1
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API