Kendo Grid not calling correct DynamicLINQ method - kendo-ui

Question

My grid won't call my parameterized DataSourceResult methods. It just calls the parameterless one. I've studied this article till my eyes are falling out. What am I missing?
From my javascript controller:
$("#grid").kendoGrid({
dataSource: {
transport: {
read: function (options) {
userService.getGridUserList($.extend(options.data))
.success(function (result) { options.success(result); })
.error(function (result) { options.error(result); });
},
parameterMap: function(options, type) {
return kendo.stringify(options);
}
},
requestStart: function (e) {
},
requestEnd: function (e) {
},
schema: {
data: "data",
total: "total"
},
pageSize: 25,
serverPaging: true,
serverSorting: true,
serverFiltering: true
},
height: 600,
filterable: true,
sortable: true,
pageable: true,
columns: [
{ field: "firstName", title: "First Name" },
{ field: "lastName", title: "Last Name" },
{ field: "email", title: "email" }
]
});
From my C# WebAPI:
//**doesn't get called**
public DataSourceResult GetGridUserList(GetUserGridListInput input)
{
var q = repository.GetAll().OrderBy(t => t.Id);
return q.ToDataSourceResult(input.Take, input.Skip. input.Sort, input.Filter);
}
//**doesn't get called**
public DataSourceResult GetGridUserList(int take, int skip, IEnumerable<Sort> sort, Filter filter)
{
var q = repository.GetAll().OrderBy(t => t.Id);
return q.ToDataSourceResult(take, skip, sort, filter);
}
//**gets called every time**
public DataSourceResult GetGridUserList()
{
var q = repository.GetAll().OrderBy(t => t.Id);
return q.ToDataSourceResult(500, 0, null, null);
}

Answer 1

Turns out I was clobbering the grid parameters in my service call. What I needed to fix it, is to add {} as the first parameter:
userService.getGridUserList({}, $.extend(options.data))

Answer 2

The example uses a POST request, perhaps the grid requires that.
"I'm using a POST since MVC blocks unsecured GETS by default. That's
good since we're going to be needing a POST request structure coming
up shortly."