问控制器代码被调用两次

EN

@model WorkflowData.ProjectWorkflow
@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}

    <div class="form-horizontal">
        <h4>Project Workflow</h4>
        <hr />
        <div>
            @{Html.RenderPartial(
                  "_WorkflowSteps", 
                  Model.ProjectWorkflowSteps.ToList());
            }
        </div>
        <div id="StepDetail"></div>
    </div>

<div>
    @Html.ActionLink("Back to List", "Index")
</div>
@section scripts{
@Scripts.Render("~/Scripts/jquery.unobtrusive-ajax.min.js")
<script>
    $(function () {
        $('.workflow-step').on('click', function (e) {
            $.get($(this).prop('href'), function (response) {
                $('#StepDetail').html(response)
            });
        });
    });
</script>
}

@Html.ActionLink(
    item.StepName,
    "Step",
    new { id = item.ProjectworkflowPages.FirstOrDefault().ProjectWorkflowPageId },
    new { @class = "workflow-step" });

    public ActionResult Step(int id)
    {
        if (id == null)
            return RedirectToAction("Index");
        using (var _db = new MarkTestDbEntities())
        {
            var stepPage = (from s in _db.ProjectworkflowPages
                            where s.ProjectWorkflowPageId == id
                            select s).FirstOrDefault();
            var projectModel = new Project
            {
                ProjectWorkflowId = stepPage.ProjectWorkflowStep.ProjectWorkflowId
            };
            return PartialView(string.Format("../{0}/{1}",stepPage.Controller, stepPage.CreateAction)
                , projectModel);
        }
        return View();
    }