YamlDotNet is a .NET library for YAML. YamlDotNet provides low level parsing and emitting of YAML as well as a high level object model similar to XmlDocument. A serialization library is also included that allows to read and write objects from and to YAML streams.
Currently, YamlDotNet supports version 1.1 of the YAML specification.
What is YAML?
YAML, which stands for "YAML Ain't Markup Language", is described as "a human friendly data serialization standard for all programming languages". Like XML, it allows to represent about any kind of data in a portable, platform-independent format. Unlike XML, it is "human friendly", which means that it is easy for a human to read or produce a valid YAML document.
The YamlDotNet library
The library has now been successfully used in multiple projects and is considered fairly stable.
More information can be found in the project's wiki.
Just install the YamlDotNet NuGet package:
PM> Install-Package YamlDotNet
If you need signed assemblies, install the YamlDotNet.Signed NuGet package instead:
PM> Install-Package YamlDotNet.Signed
If you do not want to use NuGet, you can download binaries here.
YamlDotNet is also available on the Unity Asset Store.
Please read CONTRIBUTING.md for guidelines.
- Add support for supplying custom IObjectGraphTraversalStrategy implementations.
- Add abstract WithTagMapping() method to the base serializer / deserializer builder.
- Use BenchmarkDotNet and Compile YamlDotNet with Optimize option in Release-* configurations
- Fix roundtripping of tags on sequences (#347)
- Allow to specify the maximum recusion limit (fixes #352) with the WithMaximumRecursion method.
- Add interfaces for serializer and deserializer (fixes #350).
- Fixed issue #348 that caused the assembly to have version 0.0.0.0.
/!\ This release fixes a security issue - CVE-2018-1000210. It is strongly recommended to upgrade, mainly if you are parsing documents from sources that you do not trust.
Many thanks to Kurt Boberg, from the DocuSign Application Security Team, who identified this issue and provided feedback on mitigation strategies.
Remove the legacy backwards-compatibe syntax that enabled to create
Deserializerdirectly then changing their configutation.
In most cases, the calls to the constructors should be replaced by instantiations of
DeserializerBuilder. These can be configured at will, then used to create instances of (De)serializer. It is still possible to use the default constructors, if no configuration is needed.
Drop support for specifying arbitrary type names in tags.
Support for automatically resolving a fully qualified type name from a tag has been discontinued. That feature was poorly designed and not standard.
During deserialization, each tag mapping must be explicitly registered. During serialization, when using the
EnsureRoundtripmethod, it is necessary to register tag mappings for each type that will require a tag, that is, any type that is used as the value of a property with a different declared type.
Fix bug where deserialized values were not being converted to the destination type.
var sut = new DeserializerBuilder() .WithTagMapping("!dbl", typeof(DoublyConverted)) .Build(); // The scalar "hello" will first be converted to DoublyConverted // then that value will be converted to int. var result = sut.Deserialize<int>("!dbl hello"); Assert.Equal(5, result);
- Fix issue #308: Comment on line start parsed as
- Fix bug where TypeConverter was being ignored on all platforms except .NET 3.5
- Remove serialization support from exceptions.
- This is actually a breaking change, but I don't think that anyone relies on this.
- Avoid definition of SerializationException (and some other types) on NET Standard
- Add support for (de)serialization of System.Type
- Refactored the project and solution so that they load and build cleanly in VS2017.
- Reviewed the target platforms.
- The currently supported platforms are now:
- .NET Framework 4.5
- .NET Framework 3.5
- .NET Framework 2.0 (experimental)
- .NET Standard 1.3
- Unity Subset v3.5
- The following platforms are no longer supported:
- Profile259 (please upgrade to netstandard)
- The currently supported platforms are now:
- Fix nested reference merging.
- Don't force coercion of dictionary keys to string.
- Fix public static method determining in PORTABLE mode.
- Actualy cache in CachedTypeInspector.
- Fix parser behavior when skipComments == false
In most cases, the parser failed to parse after encountering a comment.
- Support for .NET Core (
The project files have been converted to the new format, which means that older versions of Visual Studio may be unable to load them.
YamlDotNet now uses Cake to define the build script. Previously, custom powershell scripts were used.
Docker images are now available with everything that is required to build YamlDotNet, both locally, and on Travis. This is mostly useful for people wanting to develop on Linux, as it can be tricky to install the correct versions of the dependencies.
Code samples are now part of the solution
They are specified as tests, and the samples section of the wiki is generated from their source code and their output.
32bits Unicode code points in escape sequences and url-encoded tags are now properly handled.
188.8.131.52. Anchors and Aliases
When composing a representation graph from serialized events, an alias node refers to the most recent node in the serialization having the specified anchor. Therefore, anchors need not be unique within a serialization.
Added support for tag mappings on the serializer.
SerializerBuilder.WithTagMapping()to register a new tag mapping on the serializer.
Allow to unregister components from the SerializerBuilder and DeserializerBuilder.
- It accepts
DateTimeKind.Utcand Standard Date and Time Format Strings of "G" as its default parameters, if they are omitted.
- For deserialisation, it accepts as many number of formats as we want. If a value doesn't match against provided formats, it will return
FormatException. Please refer to my whole test cases.
- For serialisation, it only considers the first format in the format list.
- It accepts
Improve the (de)serializer builders so that it is possible to wrap existing component registrations.
When this property is true, naming conventions are not applied to the associated member. This solves issue 228.
- Fixed issue 189: extra '\0' after indentation indicators.
- Fixed some issues related to parsing and emitting comments.
- Fixed deserialization of ulongs greater than long.MaxValue.
- Fixed issue 218: Objects with custom type converters are traversed.
- Avoid crashing with a StackOverflowException when iterating over the AllNodes property when it's infinitely recursive.
- The samples have been added to the project as a new unit test project, to ensure that they stay up-to-date with the code. In the future, a documentation page will be generated from the samples, that will show the sample, its documentation and respective output.
This a major release that introduces a few breaking changes.
The constructors of
Deserializerare now obsolete
Except for the parameterless versions. The
DeserializerBuilderclasses should now be used to configure and create instances of the (de)serializer.
IYamlSerializableis now obsolete, but will be kept until the next major release.
EventReaderwas a wrapper over
IParserthat offered some abstractions for parsing, but also had some design flaws. It has been replaced by extension methods for
IParser. The extension methods provide the same functionality, and allow to always use the same type to represent the parser.
Dropped support for
This class has been obsolete for many releases, and it was time to let it go.
This is an important change that adds "builders" that can be used to configure the Serializer and Deserializer through a fluent syntax. The main objective of this is to allow more control over the composition of services performed by these two classes. This means that every aspect of the composition should be extensible / overridable. Things like injecting a custom TypeInspector or replacing the the default ArrayNodeDeserializer with an alternative implementation become possible and easy.
In order to avoid breaking existing code, the constructors of Serializer and Deserializer have been kept but marked as obsolete. In a future release they will be discarded.
This new interface differs in that its methods receive a delegate that can be used to reuse the current serializer or deserializer.
Improved the usability of
and other RepresentationModel classes:
- Added conversion operators and indexers for easier parsing and construction of YamlNodes.
IYamlConvertible, which means that these types can appear in the middle of an object that is being serialized or deserialized, and produce the expected result.
- Serialization Error when string starts with quote
- YamlVisitor is marked as obsolete, but no YamlVisitorBase class exists
- Do not assign anchors to scalars during serialization.
- Add YamlVisitorBase as an improved replacement for YamlVisitor
- YamlVisitor is now obsolete, and will be removed in a future release.
- Ensure compatibility with AOT compilation, for platforms that do not allow dynamic code generation, such as IOS or PS4.
- Add Yaml attribute overrides feature, similar to XML Serializer attribute overrides behavior.
- Add a YamlNodeType enumeration property to nodes.
- Fix #166 - Guid conversion to JSON is unquoted.
- Ignore enum value case during deserialization.
- Improve newline handling
- In some cases, consecutive newlines were incorrectly parsed or emitted.
- Fix #177 - double.MaxValue serialization.
- Register custom type converters with higher precedence than the built-in converters.
- Add support for different scalar integer bases.
Addresses issue #113. Adds basic support for deserializing scalar integers written in binary, octal, decimal, hex, and base 60, as allowed in the YAML specification; see http://yaml.org/type/int.html. Adds unit tests for each of these bases as well.
- Add dnx compatibility to the NuGet packages.
- Do not throw exception if a tag does not contain a valid type name.
Fixes and improvements:
- Cache type metadata.
- Fix wrong type when deserializing UInt16.
- Fix handling of special float values, such as NaN, PositiveInfinity and NegativeInfinity.
- Properly quote empty strings.
- Properly handle non-Unicode encodings when emitting scalars.
This is a minor update that simply adds an overload of YamlStream.Load to be able to specify the EventReader.
- Bug in the GetPublicMethods implementation for portable.
- Ability to opt out of anchor assignment during
- Allow the style of scalar properties to be specified through the
- Add solution configuration to target "Unity 3.5 .net Subset Base Class Libraries".
- Do not compare nodes by value while assigning anchors. It is the responsibility of the user to use the same reference if they want an alias.
- Fixed #121: Finding properties in parent interfaces
- Scalars returned by the scanner do not have their Start and End properties set.
- Add native support of System.Guid serialization.
- Add properties to YamlMemberAttribute:
- Order: specifies the order of the members when they are serialized.
- Alias: instructs the deserializer to use a different field name for serialization.
- The YamlAliasAttribute is now obsolete. New code should use YamlMemberAttribute instead.
- Throw proper exceptions, with correct marks, when deserialization of a node fails.
Changes and fixes on the Scanner to make it more usable:
- Report the location of comments correctly, when the scanner is created with "skipComments = false"
- In case of syntax error, do not report an empty range and skip to the next token.
- Make the scanner and related types serializable, so that the state of the scanner can be captured and then restored later (assuming that the TextReader is also serializable).
This release adds a signed package and portable versions of the library.
- Make types in YamlDotNet.RepresentationModel serializable.
- Fix AnchorNotFoundException when another exception occurs during deserialization.
This release adds merge key support: http://yaml.org/type/merge.html
Example from BackreferencesAreMergedWithMappings unit test:
var reader = new EventReader(new MergingParser(new Parser(stream))); var result = Deserializer.Deserialize<Dictionary<string, Dictionary<string, string>>>(parser);
This is a bugfix release that fixes issue #90.
- Add a parameter to the deserializer to ignore unmapped properties in YAML.
- Fix issue #26: Use the actual type of the objects instead of the statically detected one.
- Merged the Core, Converters and RepresentationModel assemblies. The NuGet packages YamlDotNet.Core and YamlDotNet.RepresentationModel are now a single package, named YamlDotNet.
- Removed YamlDotNet.Configuration and YamlDotNet.Converters.
- Line numbers in error messages now start at one.
- TypeConverter is now used to cast list items.
- Various code improvements.
- More and better unit tests.
YamlSerializer has been replaced by the Deserializer class. It offer the same functionality of YamlSerializer but is easier to maintain and extend.
- Breaking change: DeserializationOverrides is no longer supported. If you need this, please file a bug and we will analyze it.
- Breaking change: IDeserializationContext is no longer supported. If you need this, please file a bug and we will analyze it.
- Tag mappings are registered directly on the Deserializer using RegisterTagMapping()
- ObjectFactory is specified in the constructor, if required.
Bug fixes to the Serializer:
- Fix bug when serializing lists with nulls inside. e9019d5f224f266e88d9882502f83f0c6865ec24
Adds a YAML editor add-in for Visual Studio 2012. Available on the Visual Studio Gallery.