控制器未接收数据

I have the following JavaScript code:

vm.MostrarDiv = function() {

  $http({
    method: 'POST',
    url: _obterUrlAPI() + "ImportacaoPreFatura/ValidarLayoutTeste",
    dataType: "jsonp",
    params: {
      listaTeste: vm.carregarLayoutTeste
    }
  }).then(function successCallback(response) {
    vm.preFatura = response.data;
  }, function errorCallback(response) {
    MessageBox("Erro", response.data.Message);
  });
};

The param, vm.carregarLayoutTeste has values, but when it reach the controller.

[HttpPost]
[Route("ValidarLayoutTeste")]

public IHttpActionResult ValidarLayoutTeste(List<ValidaLayout> listaTeste) {

The listaTeste comes as null, does somebody knows why this is happening?

Try with JSON.stringify your data

params: {
 listaTeste: JSON.stringify(vm.carregarLayoutTeste)
}