OData

Create and consume RESTful APIs in a simple and standard way

ASP.NET Core - OData

Working with media resources in OData – Part 1

August 8, 2023 Aug 8, 2023 08/8/23
John Gathogo
OData enables you to define data feeds that serve binary large object (BLOB) data. In OData lingo, this binary data is referred to as a media resource. A media resource (MR) is an unstructured piece of data or stream, e.g., a document, image, or video. It is requested from the data service separately from the entry in the feed to which it ...

Enable CBOR within ASP.NET Core OData

March 14, 2023 Mar 14, 2023 03/14/23
Sam Xu
Introduction CBOR, which stands for Concise Binary Object Representation, is a data format whose design goals include the possibility of extremely small code size, small message size, and extensibility without the need for version negotiation (from cbor.io). CBOR is based on the wildly successful JSON (aka, JavaScript Object Notation) data ...

Extension: Omit null value properties in ASP.NET Core OData

September 7, 2022 Sep 7, 2022 09/7/22
Sam Xu
Introduction By default, ASP.NET Core OData serializes a single value property as “null”, and a collection value property as an empty array if its value is null as such: { "SingleValueProperty": null "CollectionValueProperty": [] } It’s good for most scenarios. However, omitting those 'annoying' null-value properties from ...

Tutorial: Build gRPC & OData in ASP.NET Core

April 20, 2022 Apr 20, 2022 04/20/22
Sam Xu
Introduction gRPC (google Remote Procedure Call) is a high-performance remote procedure call framework that helps developers to build and consume remote services using the same way as calling local APIs. Different from gRPC, OData (Open Data Protocol) is an OASIS standard that defines a set of best practices for developers to build and ...

Customizing $filter for spatial data in ASP.NET Core OData 8

February 22, 2022 Feb 22, 2022 02/22/22
Kennedy Kangethe Munga
Background The OData URI parser parses the $filter query to a FilterClause. The FilterBinder translates an OData $filter parse tree represented by a FilterClause to an Expression. The Expression can be applied to an IQueryable and passed to an ORM (e.g Entity Framework Core) for processing. The FilterBinder contains the default ...
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$compute and $search in ASP.NET Core OData 8

January 11, 2022 Jan 11, 2022 01/11/22
Sam Xu
Introduction OData system query options, such as $filter, $orderby, are a set of query string parameters that control the amount and order of the data returned for the resource identified by the URL. In the latest version of ASP.NET Core OData, two new system query options as follows are enabled: $compute: allows clients to define ...

Build formatter extensions in ASP.NET Core OData 8 and hooks in ODataConnectedService

August 23, 2021 Aug 23, 2021 08/23/21
Sam Xu
Introduction In this post, I will create formatter extensions in an OData web service and request/response hooks in an OData client application to generate/consume ETag control information. ETag (aka entity tag), one of OData control information that may be applied to an entity or collection in response, can be used in a subsequent request to...

Up & Running w/ OData in ASP.NET 6

July 10, 2021 Jul 10, 2021 07/10/21
Hassan Habib
In this article, I'm going to walk you through the simplest way you can follow to get up and running with OData 8.0 on ASP.NET 6.0 - including source code examples, video walk-throughs and a glimpse into the future of OData.