net6.0-windows 
namespace System.Data.SqlClient
{
    [DefaultMember("Item")]
    public class SqlDataReader : DbDataReader, IDbColumnSchemaGenerator, IDisposable
    {
        public ReadOnlyCollection<DbColumn> GetColumnSchema();
    }
}
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Reference this API
.NET
6.07.08.09.010.0
.NET Core
2.12.2
Information specific to net6.0
Assembly

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 (4.9.0) net6.0
Platform Restrictions

This API is supported on all platforms.

  • Built-in API
  • Package-provided API