如何使用JSON作为contentType来制作Kendo MVC Helpers的CRUD

@(Html.Kendo().DropDownListFor(model => model.ServiceID)
  .OptionLabelTemplate("#=optionLabel#")
  .ValueTemplate("#=Code#(#=Rate#) - #=Description#")
  .Template("#=Code#(#=Rate#) - #=Description#")
  .DataTextField("Code")
  .DataValueField("ServiceID")
  .DataSource(d =>
  {
    d.Read(read =>
    {
      read.Action("GetServiceRepository", "Service").Data("...")
      .Type(HttpVerbs.Post);
    });  
  })
  .OptionLabel(new { optionLabel = Resources.Wording.SelectOne, ServiceID = 0, Rate = 0, Code = "" })
)@(Html.Kendo().DropDownListFor(mode