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# OData .NET Libraries

Build Status

1. Introduction

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

OData stands for the Open Data Protocol. It was initiated by Microsoft and is now an ISO ratified 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:

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

2. Project structure

The project currently has a master branch and three archived branches: maintenance-6.x, maintenance-5.x, and maintenance-wcf-dataservice-v4.

master branch:

The master branch is the active development branch for ODataV4 7.x. It produces libraries targeting .NET 4.5 as well as .NET Standard 1.1 and 2.0. The branch builds with Visual Studio 2019.

For each profile above, it has the following libraries:

  • ODataLib (namespace Microsoft.OData.Core): The ODataLib contains classes to serialize and deserialize OData JSON payloads, and to parse OData Urls.
  • 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 and provides LINQ-enabled client APIs for issuing OData queries and constructing and consuming OData JSON payloads.

For these libraries, we accept issue reports and welcome contributions through pull requests.

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 provide for demo purposes only; it has no binary release and does not accept contributions. WebApi or RESTier is recommended for building new OData Services.

3. Building, Testing, Debugging and Release

Since we are building this on VS2019 LocalDB v12.0 or above will be used which is part of VS2019 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.

3.1 Building and Testing in Visual Studio

Simply open the shortcut OData.sln at the root level folder to launch a solution that contains the product source and relevant unit tests. Should you see the need to modify or add additional tests, please see the sln folder for the whole set of solution files.

Here is the usage of each solution file (the OData.sln shortcut opens the one marked default):

  • OData.sln - Product source built with .Net Framework 4.5, .Net Standard 1.1 (except for OData Client ), .Net Standard 2.0. Unit Tests built with .Net Framework 4.5.2, .Net Core 1.1, .Net Core 2.1, .Net Core 3.1
  • OData.E2E.sln - Product source built with .Net Framework 4.5. Contains exhaustive list of tests (unit, E2E, and regression). The Build.cmd script will run all tests from here and this solution is used to fully test your code.

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

3.2 One-click build and test script in command line

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


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 your receive build error with message "build.ps1 cannot be loaded", right click "build.ps1" -> Properties -> "Unlock".

3.3 Debug

Please refer to the How to debug.

3.4 Nightly Builds

The nightly build process will upload NuGet packages for ODataLib (Core, Edm, Spatial, Client) to the odlnightly feed.

To connect to odlnightly feed, use this feed URL: odlnightly MyGet feed URL.

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

3.5 Official Release

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

4. Documentation

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

5. Community

5.1 Contribution

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 for more details.

5.2 Support

Thank you

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


Code of Conduct

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact with any additional questions or comments.

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