netcoreapp3.0 
namespace System.Data.SqlClient
{
    public sealed class SqlConnection : DbConnection, ICloneable
    {
        public override Task OpenAsync(CancellationToken cancellationToken);
    }
}
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Reference this API
.NET
5.06.07.08.09.010.011.0
.NET Core
1.01.12.02.12.23.03.1
.NET Framework
4.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard
1.21.31.41.51.62.02.1
Information specific to netcoreapp3.0
Assemblies

System.Data.SqlClient , Version=5.0.0.0, PublicKeyToken=b03f5f7f11d50a3a

System.Data.SqlClient , Version=4.6.1.6, PublicKeyToken=b03f5f7f11d50a3a

Referencing

Your project needs a package reference to System.Data.SqlClient.

Package System.Data.SqlClient (5.0.0-alpha.1.19618.1) netcoreapp2.1
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API