Table of Contents

Earlier release notes

Version 11 is covered in What's new in 11.

10.1.0

A modernization and allocation-reduction pass. Source-compatible with 10.0: existing code recompiles cleanly.

  • Target frameworks. net10.0 is the primary, modern target. netstandard2.0 and netstandard2.1 are retained as shimmed legacy paths (.NET 8 and .NET 9 consumers use the netstandard2.1 build). Open.Database.Extensions.MSSqlClient also targets net472. The explicit net8.0 and net9.0 targets were dropped.

  • Fewer allocations on the hot paths. Case-insensitive column-to-property matching uses StringComparer.OrdinalIgnoreCase (and FrozenDictionary on net10.0) instead of allocating an upper-cased string per column. Assorted per-query LINQ and dead code were removed.

  • Ergonomic field-mapping overrides. Results<T>, ResultsAsync<T>, To<T> and similar methods accept target-typed new(...) and collection expressions:

    cmd.Results<Person>(new("FirstName", "first_name"), new("LastName", "last_name"));
cmd.Results<Person>([new("FirstName", "first_name"), new("LastName", "last_name")]);

  • Modernized params. Ordinal helpers (Retrieve, AsEnumerable and others) accept params IEnumerable<int> and params IEnumerable<string>: any enumerable, not just arrays.

  • Read-only inputs. Several read-only IList<T> parameters were widened to IReadOnlyList<T> (GetValuesFromOrdinals, EnumerateValuesFromOrdinals, ToDictionary). Arrays, List<T>, ImmutableArray<T> and similar types still bind. A custom type that implements only IList<T>, and not also IReadOnlyList<T>, would need to recompile; no BCL collection is affected.

  • Lower per-query overhead. Transformer<T> caches its per-type reflection once instead of rebuilding it on every query. Buffered and data-table paths pre-size collections and avoid redundant Select iterators.

  • Fixed a wasted-allocation and incorrect-return bug in CopyToDBNullAsNull.

  • The public API surface is tracked with Microsoft.CodeAnalysis.PublicApiAnalyzers, and unit-test coverage was substantially expanded.

9.0

  • The Open.Database.Extensions meta-package is discontinued.
  • .NET 9.0 was added to the targets so that compilation and performance improvements are available.
  • Some .NET 8 and .NET 9 specific features were implemented.
  • Significant cleanup and simplification where possible.

8.0

  • All .ConfigureAwait(true) became .ConfigureAwait(false), as they should be. A caller that needs to resume on the calling context must .ConfigureAwait(true) itself.
  • Added Open.Database.Extensions.MSSqlClient for Microsoft.Data.SqlClient support.
  • .NET 8.0 was added to the targets so that compilation and performance improvements are available.
  • Improved nullable integrity.
Edit this page