Model.MyIntArrayField = new int[]{ 1,2,3 };
   ...
   @Html.HiddenFor(model => model.MyIntArrayField)

public ViewResult MyActio(FormCollection formValues)
{
    formValues["MyIntArrayField "] //and I see the value is System.Int32[]
}

Model.MyIntArrayField = new int[]{ 1,2,3 };

<script>
        var arrayId = @Html.Raw(Json.Encode(@Model.MyIntArrayField));

        $.ajax({
            url: '@Url.Action("MyAction", "Home")',
            type: 'POST',
            contentType: 'application/json; charset=utf-8',
            data: JSON.stringify({ArrayFieldId: arrayId }),
            success: function (result) {
                // ...
            }
        });
</script>

<input name="MyIntArrayField" id="MyIntArrayField" type="hidden" value="System.Int32[]"/>

@Html.DisplayFor(m => m.MyIntArrayField, "HiddenIntArray")

@model int[]
@for (var i = 0; i < Model.Length; i++)
{
    @Html.HiddenFor(m => Model[i])
}

<input id="MyIntArrayField_0_" name="MyIntArrayField[0]" type="hidden" value="1" />
<input id="MyIntArrayField_1_" name="MyIntArrayField[1]" type="hidden" value="2" />
<input id="MyIntArrayField_2_" name="MyIntArrayField[2]" type="hidden" value="3" />

[HttpPost]
public ActionResult Index(FormCollection collection)
{
    var val1 = collection["MyIntArrayField[0]"]; // == 1

    // do something
}

[HttpPost]
public ActionResult Index()
{
    var model = new MyModel();
    this.TryUpdateModel(model);

    var val1 = model.MyIntArrayField[0]; // == 1

    // do something
}

[HttpPost]
public ActionResult Index(MyModel model)
{
    var val1 = model.MyIntArrayField[0]; // == 1

    // do something
}