c# - 检查 Request.IsAjaxRequest 在我的 asp.net mvc4 中总是返回 false

Question

我的 Controller 中有以下代码

public ActionResult Index(string searchTerm=null)
        {   System.Threading.Thread.Sleep(5000);
            var accountdefinition = repository.FindAccountDefinition(searchTerm).ToList();
            if (Request.IsAjaxRequest())
            { return PartialView("_CustomerTable",accountdefinition); }
        return View(accountdefinition);         
        }

但如果我使用 Ajax.beginform 调用上述操作方法，则 Request.IsAjaxRequest 将返回 false 并且不会返回部分 View

@using (Ajax.BeginForm(
new AjaxOptions{
    HttpMethod= "get",
    InsertionMode=InsertionMode.Replace,
    LoadingElementId = "progress",
    UpdateTargetId="customerTable"}))
    {
<div style="float:right">Search <input placeholder="Search by name.." name="searchTerm" type="text"> <input class="btn btn-success" type="submit" value="search" /></div>               

}
<div id = "progress" class="loadingimage">
<img src="~/Content/Ajax-loader-bar.gif" />
</div>

Answer 1

在我看来，我没有包含 jquery.unobtrusive-ajax.min.js