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Questions tagged [asp.net-web-api-odata]

ASP.NET 4.x Implementation of OData Services that supports both v3-v4 of the OData Protocol. DO NOT use this tag for [asp.net-core] related questions! Use this tag if your question directly relates to the ASP.NET server-side implementation of OData services, but also include the version specific tag [odata-v3] or [odata-v4]. Only include the non-specific [odata] tag if the question has broader client-side implications.

The ASP.NET Web API OData package offers support for the OData protocol in ASP.NET Web API.

OData is a standard protocol for creating and consuming data. The purpose of OData is to provide a protocol that is based on Representational State Transfer (REST) for create, read, update, and delete (CRUD) operations. OData applies web technologies such as HTTP and JavaScript Object Notation (JSON) to provide unified convention based access to information from various programs. OData provides the following benefits:

  • It lets developers interact with data by using RESTful web services.
  • It provides a simple and uniform way to share data in a discoverable manner.
  • It enables broad integration across products.
  • It enables integration by using the HTTP protocol stack.

Two key defining features of OData over traditional RESTful APIs are the URL conventions that make it possible to compose queries that request only the specific fields and navigation links from resources that are needed on the client as well as the ability to partially update resources using the PATCH HTTP verb.

  • Together these features allow individual clients to reduce the data sent across the wire without needing changes in the API or data schema to support this.

ASP.NET Web API supports both Version 3 and Version 4 of the OData protocol.
Learn more about ASP.NET Web API OData on MSDN

The code from this package to implement this protocol makes heavy use of Language Integrated Query (LINQ) expressions to support deferred execution of client requests, in a sense the ODataLib translates a specific set of URL queries into LINQ queries.

While not required, the ASP.NET implementation has extensive support for using Entity-Framework to access the data layer, reducing the code necessary to expose EF data schemas as OData resources. For this reason Posts on SO related to this tag will often include EF references and concepts.

You can also find more information on:

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ASP.NET OData / Web API Authentication and documentation

I am implementing an OData endpoint on an ASP.NET application, and am working right now on the authentication part. I looked at the example at http://odata.github.io/WebApi/05-01-basic-auth/ for implementing HTTP Basic authentication. However, the…
hrnt
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Optimistic Concurrency Handling - Asp.Net WebApi Odata V4

This is the Patch method of my OdataController public async Task Patch([FromODataUri] int key, Delta patch) { Validate(patch.GetInstance()); Product product = await service.Products.GetAsync(key); if (product ==…
Rahul
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ODataConventionModelBuilder sees my List property as a new EntitySet and throws 'The entity 'List_1Of[Type]' does not have a key defined.'

I apologize if this is very trivial, I am new to OData and I am trying to set up my model. I have a class like this: public class EventInfo { public bool Open{ get; set; } public List Attendees { get; set; } public string…
AlineF
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How to encrypt output result of OData while keeping search/filters not encrypted?

I have an Web API OData controller that is connected to an encrypted data source. I want to send data back to clients as encrypted but do not want get search/filter functionality from client. It is needed that client can query over data as like it…
Afshar Mohebi
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Web Api OData v4 FromODataUri always returning 404 Not Found

I' trying invoke a web api odata controller method that receives a parameter from the uri, like below: // GET /odata/People(3) public SingleResult Get([FromODataUri] int key) { return…
rotaran
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When writing C# ODATA controller with ODataRoutePrefixAttribute how to bind parameters to properties of the class instead of parameter in the method?

In the documentation of ODATA's WebAPI there is a page about Attribute Routing. In this page, there is an example about using ODataRoutePrefixAttribute when all requests to a particular controller have the same prefix, and this prefix can include a…
fpintos
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Using AttachTo with a Contained EntitySet

I have some classes defined as below: public class Table { [Key] public string Name { get; set; } [Contained] public IList Entities { get; set; } } public class TableEntity { [Key] public string Partition {…
NStuke
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$select returning empty json result for Navigation Property

i am using v4 of oData in an web api. my get all call returns the entire set (total 3 objects) properly. http://localhost:9910/api/CommandsRest but trying to select just the StoreCommand gives me 3 blank…
Raas Masood
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oData filter not working on navigation property with MongoDB and Web API

Controller looks like public class NodesRestController : ODataController { private INodeService _nodeService; public NodesRestController(INodeService nodeService) { _nodeService = nodeService; } [EnableQuery()] …
Raas Masood
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Add calculated value to OData result

I'm trying to add some info to the data result whether the user has read or write access to the entity. Lets assume I have this entity: public class Foo { public int Id { get; set; } public string Name { get; set; } public virtual…
Snæbjørn
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How to have two self-references in an entity class

I have a Foo that can have two optional references to itself: ParentId and RootId. public class Foo { [Key] public int FooId { get; set; } public int? ParentId { get; set; } [ForeignKey(nameof(ParentId))] public virtual Foo…
kiewic
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Abstract Generic ODataController Leads To 'No HTTP resource was found'

I have this base ODataController public abstract class BaseController : ODataController where T : class { [EnableQuery] public IHttpActionResult Get() { return Ok(Repository.AsQueryable()); } [EnableQuery] public…
Snæbjørn
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Not a valid Odata path template

I am trying to create Odata method that satisfy url like domain:port/products/100/RedirectUrl() [ODataRoute("{id}/RedirectUrl()")] public IHttpActionResult RedirectUrl(int id) { return Redirect("myUrl" + id); } but i got exception like The…
Linoy
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Created(entity) throw exception with composite key

I have an entity (MyEntity) that uses a composite key. The entity is posted and inserted just fine, however when Created() is called it throws an InvalidOperationException with the message. The edit link builder for the entity set 'MyEntity'…
Snæbjørn
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Can't route to methods in BaseController when Derived is using ODataRoute

I'm having problems routing to my BaseController for controllers where I define extra [ODataRoute]s. GET ~/odata/Foos WORKS GET ~/odata/Foos(1) WORKS GET ~/odata/Foos(1)/Bars WORKS GET ~/odata/Bars 404 Not Found BaseController public abstract…
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