The OData .NET Libraries (or OData .NET, for short) project includes the implementation of core functionalities of OData protocol on the .NET platform which includes URI parsing, request and response reading and writing, Entity Data Model (EDM) building, and also a .Net OData client which can be used to consume OData service. It is a fully open sourced project maintained by Microsoft OData team. The libraries are used by WebApi and RESTier which are recommended to be adopted to build new OData Services.

OData stands for the Open Data Protocol. It was initiated by Microsoft and is now an ISO approved and OASIS standard. OData enables the creation and consumption of REST APIs, which allow resources, identified using URLs and defined in a data model, to be published and edited by Web clients using simple HTTP requests.

For more information about OData, please refer to the following resources:

• OData.org
• OASIS Open Data Protocol (OData) Technical Committee

For how to adopt this and related libraries to build or consume OData service, please refer to the following resources:

• Build an OData v4 Service with RESTier Library
• Build an OData v4 Service with OData WebApi Library
• OData .Net Client

The project currently has six branches: master, release, gh-pages, maintenance-6.x, maintenance-5.x, and maintenance-wcf-dataservice-v4.

master branch:

This master branch is the developement branch for ODataV4 7.x and is now most actively iterated. It builds upon the OData 6.15 release which is now on maintenance-6.x branch and produces both PCL (Portable Class Libraries) Profile111 and .NET Standard 1.1 libraries.

For each profile above, it has the following libraries:

• ODataLib (namespace Microsoft.OData.Core): The ODataLib contains classes to serialize, deserialize and validate OData JSON payloads.
• EdmLib (namespace Microsoft.OData.Edm): The EdmLib contains classes to represent, construct, parse, serialize and validate entity data models.
• Microsoft.Spatial (namespace Microsoft.Spatial): The spatial library contains classes and methods that facilitate geography and geometry spatial operations.
• OData Client for .NET (namespace Microsoft.OData.Client): The client library is built on top of ODataLib and EdmLib that has LINQ-enabled client APIs for issuing OData queries and consuming OData JSON payloads.

For these libraries, we accept bug reports and pull requests. The corresponding fixes and implementations will be included into every new release.

While Visual Studio 2017 has been released, this branch currently compiles against Visual Studio 2015 due to internal migrations to Visual Studio 2017--rest assured, the desire to move to the new product is highly visible. With that said, this branch utilizes project.json files for its .csproj files, there is a change in the build process for those who are unfamiliar. Please either 1) run nuget restore Microsoft.Test.OData.DotNetStandard.sln in the commandline of the odata.net/sln directory, or 2) enable automatic package restore via Visual Studio to build them (in VS2015, go to Tools->NuGet Package Manager->Package Manager Settings. Enable "Allow NuGet to download missing packages".). More info regarding the command can be found here.

release branch:

This branch is for ODataV4 7.x release developed on the master branch, contains most recently stable ODataV4 7.x release code base.

gh-pages branch:

The gh-pages branch contains documentation source for OData v4 Lib - tutorials, guides, etc. The documention source is in Markdown format. It is hosted at ODataLib Pages.

maintenance-6.x branch: (maintenance mode)

The maintenance-6.x branch includes the .NET libraries for ODataV4 6.x maintenance releases.

maintenance-5.x branch: (maintenance mode)

The maintenance-5.x branch includes the .NET libraries for OData V1-3 releases only. It has the similar libraries as the maintenance-6.x branch except for some differences in namespaces and two additional libraries:

• ODataLib for OData v1-3 (namespace Microsoft.Data.Core): It contains classes to serialize, deserialize and validate OData payloads. Enables construction of OData producers and consumers.
• EdmLib for OData v1-3 (namespace Microsoft.Data.Edm): It contains classes to represent, construct, parse, serialize and validate entity data models.
• System.Spatial for OData v1-3 (namespace System.Spatial): It contains classes and methods that facilitate geography and geometry spatial operations.
• WCF Data Services Client for OData v1-3 (namespace Microsoft.Data.Services.Client): It contains LINQ-enabled client API for issuing OData queries and consuming OData payloads.
• WCF Data Services Server for OData v1-3 (namespace Microsoft.Data.Services): Fully-featured server API for responding to OData queries and consuming/producing OData payloads.
• WCF Data Services EntityFramework Provider (namespace Microsoft.OData.EntityFrameworkProvider): Server API for responding to OData queries and consuming/producing OData payloads based on entity framework version 6.0 or higher.

These libraries are in maintenance mode. Only security bugs will be accepted. The release will be irregular depends on the bugs fixed.

maintenance-wcf-dataservice-v4 branch: (maintenance mode)

The maintenance-wcf-dataservice-v4 branch has the source code of the OData V4 parity of the WCF Data Services Server for OData v1-3. It is only for cloning and doesn't accept contributions. There is no binary release of it either. WCF DS is not recommended to be adopted now, instead WebApi or RESTier is recommended to be adopted to build new OData Services.

In the case of VS2013, SQL Express 2008 or above must be installed. In the case of VS2015, LocalDB v12.0 or above will be used which is part of VS2015 and no additional installation is needed. The Database will be automatically initialized by the test code if it doesn't exist.

Note: The project T4CrossPlatformTests.WindowsStore.csproj will not be loaded unless you have installed the Windows 8.1 and Windows Phone 8.0 / 8.1 tools.

Simply open the solution files under 'sln' folder and build them in Visual Studio 2013 or 2015.

Here is the usage of each solution file:

• Microsoft.OData.Lite.sln - Product source and minimal functional tests. Recommended for doing general bugfix and feature development. It is built with .Net Framework Portable version 4.0.
• Microsoft.OData.Full.sln - Product source and full functional tests (excluding test cases in Lite and E2E solution). Used to fully test your code.
• Microsoft.OData.E2E.sln - Product source and end-to-end tests.
• Microsoft.OData.Net35.sln - Solution with product source built with .Net Framework version 3.5.
• Microsoft.OData.Net45.sln - Solution with product source built with .Net Framework version 4.5.
• Microsoft.OData.Portable45.sln - Solution with product source built with .Net Framework Portable version 4.5.
• Microsoft.OData.Performance.sln - Product source and performance tests built with .Net Framework version 4.6.
• Microsoft.OData.CodeGen.sln - Source and tests for OData T4 client code generator.

Each solution contains some test projects. Please open it, build it and run all the tests in the test explorer. For running tests within Microsoft.OData.Full.sln and Microsoft.OData.E2E.sln, you need to open Visual Studio IDE as Administrator so that the test services can be started properly.

Open Command Line Window with "Run as administrator", cd to the root folder and run following command:

`build.cmd`

This will build the full product and run all tests. It will take about 60 minutes. Use the to ensure your change compiles and passes tests before submitting a pull request.

Optionally, you can run following command:

`build.cmd quick`

This will build a single set of product Dlls and run unit tests. It will take about 5 minutes. Use this for quickly testing a change.

Here are some other usages or build.cmd:

• build.cmd or build.cmd Nightly - Build and run all nightly test suites.
• build.cmd Quick or build.cmd -q - Build and run all unit test suites (with less legacy tests thus faster).
• build.cmd EnableSkipStrongName - Configure strong name skip of OData libraries on your machine and build (no test run).
• build.cmd DisableSkipStrongName - Disable strong name skip of OData libraries on your machine and build (no test run).

Notes: If there is build error with message "build.ps1 cannot be loaded", right click "build.ps1" -> Properties -> "Unlock".

Please refer to the How to debug.

We keep uploading the daily nightly signed NuGet packages for ODataLib/EdmLib/ClientLib/SpatialLib to our MyGet feed.

You can query the latest nightly NuGet packages using this MAGIC OData query

The release of the component binaries is carried out regularly through Nuget.

Please visit the ODataLib pages. It has detailed descriptions on each feature provided by OData lib, how to use the OData .Net Client to consume OData service etc.

There are many ways for you to contribute to OData .NET. The easiest way is to participate in discussion of features and issues. You can also contribute by sending pull requests of features or bug fixes to us. Contribution to the documentations is also highly welcomed. Please refer to the CONTRIBUTING.md for more details.

• Issues: Report issues on Github issues.
• Questions: Ask questions on Stack Overflow.
• Feedback: Please send mails to odatafeedback@microsoft.com.
• Team blog: Please visit http://blogs.msdn.com/b/odatateam/ and http://www.odata.org/blog/.

We’re using NDepend to analyze and increase code quality.