Question

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OData pagination with WebApi ( $inlinecount )

Since Asp.net WebAPi almost supports odata, its very enticing for me to get $inlinecount to work so that it plays nicely with kendo ui ( or any other).
So that it returns value in jsonp format, i implemented a new MediaFormatter ( from Stackoverflow).

Trouble is that it needs the results to have count element in them in order to get server side paging to work, so for now i hacked the formatter to get a fake count to work. This all works great and the grid is all happy, however getting the real count is a challenge since IQueryable expression being returned already has filters/Take etc applied to it.

 public override Task WriteToStreamAsync(Type type, object value, Stream stream, HttpContentHeaders contentHeaders, TransportContext transportContext)
    {
        string callback;
        if (IsJsonpCountableRequest(out callback))
        {
            return Task.Factory.StartNew(() =>
            {
                var q = value as IQueryable<Movie>;
                var count = q.Count(); // this count doesnt return the actual count
                var writer = new StreamWriter(stream);
                writer.Write(callback + "({");
                writer.Write(@"""d""");
                writer.Write(" : { ");
                writer.Write(@"""results""");
                writer.Write(" : ");
                writer.Flush();
                base.WriteToStreamAsync(type, value, stream, contentHeaders, transportContext).Wait();
                writer.Write(",");
                writer.Write(@"""__count""");
                writer.Write(" : ");

                writer.Write(string.Format(@"""{0}""", count));
                writer.Write("}");

                writer.Write("})");
                writer.Flush();
            });
        }
        else
        {
            return base.WriteToStreamAsync(type, value, stream, contentHeaders, transportContext);
        }
    }

Is there a way to get the a count separately, may be from the underlying provider of the IQueryable ?

Answer 1

Try this approach: http://www.strathweb.com/2012/08/supporting-odata-inlinecount-with-the-new-web-api-odata-preview-package/

It uses the latest Web API OData package.