在ODATA的WebAPI更新导航属性(Updating Navigation Property i

我使用的WebAPI的OData。要求是更新实体的导航属性。

public class Question
{
    public int QuestionId { get; set; }
    public string QuestionTitle { get; set; }
    public string QuestionBody { get; set; }
    public List<Response> Responses { get; set; } //navigation property
}

public class Response
{
    public string ResponseId { get; set; }
    public int QuestionId { get; set; } //fk
    public string ResponseBody { get; set; }
}

现在，如果我使用下面的链接来获取它工作在ODATA的WebAPI的答复

GET - /的OData /问题（1）/响应----成功合作。在控制器我添加了一个动作来处理此请求为：

public IQueryable<Response> GetResponses([FromODataUri] Guid key)
{
    //
}

POST - /的OData /问题（1）/响应---- 这是行不通的 ; 错误消息：该服务不支持的格式“〜/ EntitySet的/键/导航”的OData请求

我在控制器中添加的方法是：

public List<Responses> CreateResponses([FromODataUri] Guid key, List<Response> responses)
{
     //
}

我如何支持增加/中的OData的WebAPI更新导航性能

你需要一个自定义路由惯例来处理POST的导航性能。下面的代码，

// routing convention to handle POST requests to navigation properties.
public class CreateNavigationPropertyRoutingConvention : EntitySetRoutingConvention
{
    public override string SelectAction(ODataPath odataPath, HttpControllerContext controllerContext, ILookup<string, HttpActionDescriptor> actionMap)
    {
        if (odataPath.PathTemplate == "~/entityset/key/navigation" && controllerContext.Request.Method == HttpMethod.Post)
        {
            IEdmNavigationProperty navigationProperty = (odataPath.Segments[2] as NavigationPathSegment).NavigationProperty;
            controllerContext.RouteData.Values["key"] = (odataPath.Segments[1] as KeyValuePathSegment).Value; // set the key for model binding.
            return "PostTo" + navigationProperty.Name;
        }

        return null;
    }
}

注册路由惯例，

var routingConventions = ODataRoutingConventions.CreateDefault();
routingConventions.Insert(0, new CreateNavigationPropertyRoutingConvention());
server.Configuration.Routes.MapODataRoute("odata", "", GetEdmModel(), new DefaultODataPathHandler(), routingConventions);

完整的范例在这里。