<PackageReference Include="Microsoft.Data.SqlClient" Version="7.0.0-preview2.25289.6" />

Microsoft.Data.SqlClient.SqlErrorCollection

public sealed class SqlErrorCollection : ICollection, IEnumerable
Collects all errors generated by the .NET Framework Data Provider for SQL Server. This class cannot be inherited.
namespace Microsoft.Data.SqlClient { public sealed class SqlErrorCollection : ICollection, IEnumerable { public int Count { get; } public SqlError this[int index] { get; } public void CopyTo(SqlError[] array, int index); public void CopyTo(Array array, int index); public IEnumerator GetEnumerator(); } }