$ inlinecount无法使用ApplyTo在ApiController上运行

Question

I'm trying to use the OData filtering and paging capabilities in a standard Web API 2.2 ApiController . For this, I have to rewrite the request URL to conform to the OData v4 standards. My controller looks like this:

public GridPage Get([FromUri] GridSearchCriteria criteria)
{
    Request.RequestUri = ... // convert querystring to OData v4
    var context = new ODataQueryContext(MyEdmModel.Instance, typeof(Delivery), null);
    ODataQueryOptions<Delivery> options = new ODataQueryOptions<Delivery>(context, Request);

    IQueryable<Delivery> deliveries = ... // use EF to load deliveries from DB
    var result = (IQueryable<Delivery>)options.ApplyTo(deliveries); // BTW, I wonder why there is no generic overload of ApplyTo?

    // fill and return a GridPage
    ...
}

So far everything works nice as expected.

Now, I'm interested in the total count of the filtered items and thus I've added $inlinecount=allpages to the query string. The resulting request URI looks like this:

http://localhost:54026/.../deliveries/page?$top=10&$skip=0&$inlinecount=allpages}

Then, I'm trying to retrieve the total count like this (after the call to ApplyTo ):

long? totalCount = Request.ODataProperties().TotalCount;

Unfortunately, totalCount always stays null no matter what I try. I've also tried using:

object totalCount;
Request.Properties.TryGetValue("System.Web.OData.TotalCount", out totalCount);

but no luck. A peek into the Request properties reveals that there is an entry under System.Web.OData.Properties but all its properties are uninitialized ( Model is null, NextLink is null, TotalCount is null, etc.).

Does anybody have an idea why this isn't working? BTW, I'm using Microsoft.AspNet.OData v5.6.

Answer 1

I had to specify $count=true instead of $inlinecount=allpages . According to https://damienbod.wordpress.com/2014/06/13/web-api-and-odata-v4-queries-functions-and-attribute-routing-part-2/ this was a breaking change somewhere.