netcoreapp2.1 
namespace System.Data.Odbc
{
    [DefaultMember("Item")]
    public sealed class OdbcDataReader : DbDataReader
    {
        public override string! GetString(int i);
    }
}
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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 1.12.03.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.02.1
Information specific to netcoreapp2.1
Assemblies

System.Data.Odbc , Version=9.0.0.3, PublicKeyToken=cc7b13ffcd2ddd51

System.Data.Odbc , Version=10.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

Referencing

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

Package System.Data.Odbc (9.0.3) netstandard2.0
Platform Restrictions

This API is supported on any platform except for these:

  • Browser
  • Built-in API
  • Package-provided API