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Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

2.0.205 - 2025-10-21

Added

  • Support for nullable headers and convenience overloads (#66)
  • Span/Memory APIs for .NET 8.0+ for high-performance scenarios
  • .NET 9 support in tests (#92)
  • .NET 9 setup for CodeQL workflow (#91)

Fixed

  • Correct header count for HeaderAbsent mode with multiline fields (#72)
  • Compile error in Assert.Throws
  • Relaxed performance test thresholds for CI environments

Changed

  • Moved PRD to docs folder and updated documentation guidelines
  • Enhanced documentation with architecture details and NuGet badges
  • Updated dependencies:
    • mstest monorepo to v4
    • microsoft.net.test.sdk to v18
    • github/codeql-action to v4
    • actions/stale to v10
    • actions/setup-dotnet to v5
    • actions/checkout to v5
    • microsoft.net.test.sdk to 17.14.1
    • mstest monorepo to 3.9.3

Performance

  • Eliminated regex usage in CSV parsing for better performance

2.0.170 - 2025-05-20

Added

  • AllowEnclosedFieldValues option (#51, #84)
  • LineHasColumn method to check if a column exists (#32, #90)
  • WriteAsync overload with CancellationToken support (#76)
  • Comprehensive test coverage for:
    • Comma inside quoted text (#73, #86)
    • Invalid CSV scenarios (#87)
    • Async operations (#88)
    • Skip-header functionality (#88)

Fixed

  • Writer null cell handling (#74, #83)
  • Environment.NewLine usage in writer tests (#89)

Changed

  • Removed regex splitting in favor of more efficient parsing (#82)
  • Expanded README with async and helper APIs documentation (#85)
  • Updated target frameworks and NuGet properties
  • Updated tests to .NET 9
  • Updated dependencies:
    • mstest monorepo to 3.9.0
    • microsoft.net.test.sdk to 17.14.0
    • github/codeql-action to v3
    • mstest monorepo to 3.8.3

2.0.128 - 2025-02-20

Added

  • .NET 8.0 target framework support
  • Trimming and AOT (Ahead-of-Time compilation) support
  • Collection expressions support
  • Additional .NET 8 method overloads

Changed

  • Deprecated .NET Standard 1.0 target (no longer recommended)
  • Fixed NuSpec paths
  • Code cleanup: warnings and whitespace
  • ReSharper code style improvements
  • Updated dependencies:
    • actions/checkout to v4
    • actions/stale to v9
    • microsoft.net.test.sdk to v17.6.0 (#61)
    • microsoft.net.test.sdk to v17.5.0 (#58)
    • actions/stale to v7 (#59)

2.0.93 - 2022-12-10

Changed

  • Updated microsoft.net.test.sdk to v17.4.0 (#55)
  • Updated microsoft.net.test.sdk to v17.3.2 (#53)
  • Updated actions/stale to v6 (#54)

2.0.87 - 2022-09-02

Added

  • Async methods for Write and WriteToText (#52)
  • Support for IAsyncEnumerable<string[]>

Fixed

  • Various fixes for async write operations (#52)

Changed

  • Updated mstest monorepo to v2.2.10 (#40)

2.0.84 - 2022-05-04

Added

  • GetColumn and GetBlock extension methods (#46)
    • GetColumn(int columnNo) and GetColumn(int columnNo, Func<string, T>)
    • GetBlock(int row_start, int row_length, int col_start, int col_length)

Changed

  • Updated github/codeql-action to v2 (#45)

2.0.80 - 2022-04-21

Changed

  • Updated microsoft.net.test.sdk to v17 (#43)
  • Updated multiple dependencies:
    • microsoft.net.test.sdk to v15.9.2 (#37)
    • microsoft.sourcelink.github to v1.1.1 (#38)
    • actions/checkout to v3 (#41)
    • actions/stale to v5 (#42)

2.0.76 - 2022-04-21

Changed

  • Updated mstest monorepo to v2 (#44)

2.0.67 - 2022-03-31

Added

  • Renovate configuration for automated dependency updates (#36)

2.0.65 - 2022-01-18

Fixed

  • Fixed issue #35 with proper test coverage

2.0.64 - 2021-12-26

Added

  • Option to skip header when writing CSV files

2.0.62 - 2020-12-24

Changed

  • Moved custom logic from SplitLine to CsvLineSplitter

Performance

  • Improved performance for .Replace call

2.0.61 - 2020-12-23

Added

  • Span/Memory support for .NET Core 3.1 and .NET Standard 2.1
  • .NET Core 3.1 support
  • .NET Standard 2.1 target (enables use in Blazor WASM projects) (#29)
  • CodeQL analysis workflow

Fixed

  • Fixed issue #28

Performance

  • Prefer Span/Memory APIs for better performance on supported frameworks

Earlier Versions

[1.x] - 2015-2020

The library was initially released with comprehensive CSV reading and writing functionality:

Core Features

  • CSV reading from TextReader, Stream, and string
  • CSV writing with header support
  • Configurable separators with auto-detection
  • Header row handling (present/absent modes)
  • Quote and escape character handling
  • Multiline field support (#24)
  • Column access by name or index
  • Custom row validation and skipping

Configuration Options (CsvOptions)

  • RowsToSkip and SkipRow for filtering
  • TrimData for whitespace handling
  • Comparer for case-insensitive column names
  • ValidateColumnCount for strict validation
  • ReturnEmptyForMissingColumn for flexible access
  • Aliases for alternative column names
  • AllowNewLineInEnclosedFieldValues for multiline fields
  • AllowBackSlashToEscapeQuote for escape sequences
  • AllowSingleQuoteToEncloseFieldValues for single-quote support

Additional Functionality

  • SourceLink support (2018-08-28)
  • CsvWriter class for generating CSV output (2018-02-14)
  • Values property to retrieve all row values (#16)
  • codecov integration (2019-02-17)
  • CodeQL analysis (2020-10-02)

Bug Fixes

  • Fixed issues #10, #11, #14, #19, #28, #35
  • Fixed multiline parsing bugs (#24)
  • Fixed unterminated quoted value detection

Framework Support

  • Initial targets: .NET Standard 1.3, .NET 4.0
  • Added .NET Standard 2.0 support
  • Added .NET Standard 2.1 support (2020)
  • Added .NET Core 3.1 support (2020)

For more details on each release, see the commit history or visit the NuGet package page.