c# – .Net WebApi OData返回Queryable的 *** 作

概述我想要实现一些接近RateProduct的动作,描述如下： http://www.asp.net/web-api/overview/odata-support-in-aspnet-web-api/odata-actions 在该教程中,它被定义为： [HttpPost]public int RateProduct([FromODataUri] int key, ODataActionParame 我想要实现一些接近RateProduct的动作,描述如下： http://www.asp.net/web-api/overview/odata-support-in-aspnet-web-api/odata-actions

在该教程中,它被定义为：

[httpPost]public int RateProduct([FromODataUri] int key,ODataActionParameters parameters) {     // ...}ODataModelBuilder modelBuilder = new ODataConventionModelBuilder();modelBuilder.EntitySet<Product>("Products");// New CodeActionConfiguration rateProduct = modelBuilder.Entity<Product>().Action("RateProduct");rateProduct.Parameter<int>("rating");rateProduct.Returns<int>();

但是,我有一个位置实体的用例,足够聪明地返回其周围的某个半径的其他位置.大概应该是这样的：

[httpPost]public Iqueryable<Location> GetLocationsWithinRadius([FromODataUri] int key,ODataActionParameters parameters) {     // Get the Location instance intended to be the center of the radius by using the key    // Do a radius search around it using (int)parameters["radius"] as the radius    // return the Iqueryable<Location> of all location found within that radius}ODataModelBuilder modelBuilder = new ODataConventionModelBuilder();modelBuilder.EntitySet<Location>("Locations");// New CodeActionConfiguration getLocations = modelBuilder.Entity<Location>().Action("GetLocationsWithinRadius");getLocations.Parameter<int>("radius");getLocations.Returns<Iqueryable<Location>>();

我希望让这个工作,当前的返回类型是Iqueryable< Location>当前它不起作用.如果返回类型是一个像int的原始类型,那么它可以工作,否则当我在fiddler中创建一个帖子时,它会给出以下错误(该帖子类似于http：// localhost：2663 / odata / Locations(2112)/ GetLocationsWithinRadius请求正文为{radius：50})：

{  "odata.error":{    "code":"","message":{      "lang":"en-US","value":"An error has occurred."    },"innererror":{      "message":"The 'ObjectContent`1' type Failed to serialize the response body for content type 'application/Json; odata=minimalMetadata; streaming=true; charset=utf-8'.","type":"system.invalIDOperationException","stacktrace":"","internalexception":{        "message":"The related entity set Could not be found from the OData path. The related entity set is required to serialize the payload.","type":"System.Runtime.Serialization.SerializationException","stacktrace":"   at System.Web.http.OData.Formatter.Serialization.OdatafeedSerializer.WriteObject(Object graph,ODataMessageWriter messageWriter,ODataSerializerContext writeContext)\r\n   at System.Web.http.OData.Formatter.ODataMediaTypeFormatter.<>c__displayClassa.<WritetoStreamAsync>b__9()\r\n   at System.Threading.Tasks.TaskHelpers.RunSynchronously(Action action,CancellationToken token)"      }    }  }}

可以做我想要完成的工作吗？如果是,请问是否返回的Iqueryable< Location>变得与odata paramaters …(那将是很好)

谢谢

解决方法 看起来你的动作配置不正确.尝试以下内容,看看它是否有效：

//getLocations.Returns<Iqueryable<Location>>();getLocations.ReturnsCollectionFromEntitySet<Location>("Locations");

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