Batch operation with asp.net mvc4 webapi

use this api controller:
public class PersonController:ApiController
{
      // other codes...
       public HttpResponseMessage PostNewPersons(IEnumerable<PesonDTO> people)
        {
            foreach (PersonDTO dto in people)
                _personAppSrv.Create(dto);
            return new HttpResponseMessage(HttpStatusCode.Created);
        }
    // other codes...
}

use DataSource in webpage:

var ds = new kendo.data.DataSource(
{
transport:{
create: {
                        url:  "/api/person",
                        dataType: "json",
                        type:"Post",
                        contentType: 'application/json;charset=utf-8'    // important!!
                    },
//other codes
  parameterMap: function (options, operation) {
                        if (operation !== "read" && options.models) {
                            return JSON.stringify(options.models);
                        }
                },
batch:true,
//other codes
});

I use gird to run  batch operation like example. If I don't set contentType to 'application/json;' in code above, the request content's contentType is 'application/x-www-form-urlencoded'! Then the api controller can't convert request content data to 'PersonDTO' instance. If I set it, it works well.

If anyone has more better solution, please tell me ,thanks.