ODataController返回HTTP 406不可接受

我正在Web API 2.2上构建OData 3服务。

该服务正确返回我的实体的元数据，但在查询其中一个实际实体时返回406 Not Available 。 我做了很多研究（我目前正在学习几个教程），但我还没有找到任何实际工作的东西。

这是我的WebApiConfig：

 using System; using System.Collections.Generic; using System.Linq; using System.Web.Http; using System.Web.OData.Builder; using System.Web.OData.Extensions; namespace MyProject { public static class WebApiConfig { public static void Register(HttpConfiguration config) { ODataModelBuilder builder = new ODataConventionModelBuilder(); builder.EntitySet("MarvelCharacters"); config.MapODataServiceRoute( routeName: "Marvel", routePrefix: "dude", model: builder.GetEdmModel()); } } } 

和我的控制器（不完整，但你明白了）：

 using System; using System.Collections.Generic; using System.Data; using System.Linq; using System.Net; using System.Net.Http; using System.Web.Http; using System.Web.Http.OData; using System.Web.Http.OData.Query; using Microsoft.Data.OData; using MyProject; namespace MyProject.Controllers { public class MarvelCharactersController : ODataController { private static ODataValidationSettings _validationSettings = new ODataValidationSettings(); // GET: odata/MarvelCharacters public IHttpActionResult GetMarvelCharacters(ODataQueryOptions queryOptions) { // validate the query. try { queryOptions.Validate(_validationSettings); } catch (ODataException ex) { return BadRequest(ex.Message); } var entities = new myEntities(); var marvelCharacters = (from c in entities.MarvelCharacters select c).ToList(); return Ok<IEnumerable>(marvelCharacters); } } } 

Answer 1

事实certificate这个问题的答案非常简单，但是我找不到任何文档都不能很好地解决这个问题。

我试图在WebAPI 2.2上实现OData 3端点。 我正在学习几个不同的教程，一些用于OData 3，一些用于OData 4。

我在我的WebApiConfig中使用OData 4（ System.Web.OData ），在我的控制器中使用OData 3（ System.Web.Http.OData ）。 事实certificate，他们并不能很好地融合在一起。

我决定在这里发布答案，以防其他人有类似的问题。

为了增加一点价值，因为无论如何我都在混合，我决定继续通过在我的WebApiConfig中对命名空间进行别名，然后创建版本控制器来设置对版本3和版本4的支持。

WebApiConfig：

 using System; using System.Collections.Generic; using System.Linq; using System.Web.Http; using ODataV3 = System.Web.Http.OData; using ODataV4 = System.Web.OData; namespace MyProject { public static class WebApiConfig { public static void Register(HttpConfiguration config) { // OData V3 Route ODataV3.Builder.ODataModelBuilder builder3 = new ODataV3.Builder.ODataConventionModelBuilder(); builder3.EntitySet("MarvelCharactersV3"); // The MapODataRoute function is deprecated in WebAPI 2.2, // but I haven't found an alternative for supporting OData 3. config.Routes.MapODataRoute( routeName: "Marvel3", routePrefix: "dude3", model: builder3.GetEdmModel()); // ODate V4 Route ODataV4.Builder.ODataModelBuilder builder4 = new ODataV4.Builder.ODataConventionModelBuilder(); builder4.EntitySet("MarvelCharactersV4"); ODataV4.Extensions.HttpConfigurationExtensions.MapODataServiceRoute( configuration: config, routeName: "Marvel4", routePrefix: "dude4", model: builder4.GetEdmModel()); } } } 

MarvelCharactersV3（OData 3）：

 using System; using System.Collections.Generic; using System.Data; using System.Linq; using System.Net; using System.Net.Http; using System.Web.Http; using System.Web.Http.OData; // OData V3 using System.Web.Http.OData.Query; using Microsoft.Data.OData; using MyProject; namespace MyProject.Controllers { public class MarvelCharactersV3Controller : ODataController { private static ODataValidationSettings _validationSettings = new ODataValidationSettings(); // GET: odata/MarvelCharacters public IHttpActionResult GetMarvelCharactersV3(ODataQueryOptions queryOptions) { // validate the query. try { queryOptions.Validate(_validationSettings); } catch (ODataException ex) { return BadRequest(ex.Message); } var entities = new myEntities(); var marvelCharacters = (from c in entities.MarvelCharacters select c).ToList(); return Ok>(marvelCharacters); } } } 

MarvelCharactersV4（OData 4）：

 using System; using System.Collections.Generic; using System.Data; using System.Linq; using System.Net; using System.Net.Http; using System.Web.Http; using System.Web.OData; // OData 4 using System.Web.OData.Query; using Microsoft.Data.OData; using MyProject; namespace MyProject.Controllers { public class MarvelCharactersV4Controller : ODataController { private static ODataValidationSettings _validationSettings = new ODataValidationSettings(); // GET: odata/MarvelCharacters public IHttpActionResult GetMarvelCharactersV4(ODataQueryOptions queryOptions) { // validate the query. try { queryOptions.Validate(_validationSettings); } catch (ODataException ex) { return BadRequest(ex.Message); } var entities = new myEntities(); var marvelCharacters = (from c in entities.MarvelCharacters select c).ToList(); return Ok>(marvelCharacters); } } } 

它可能不是最好的架构（我可能会创建一个库来整合控制器之间的类似代码），但我已经测试过，我可以通过OData 3和OData 4成功查询，所以我现在对它很满意。