ASP.NET MVC 5应用程序中的AntiForgeryToken错误

我收到此错误-即使在我看来，AntiForgeryToken在表单标签中也确实是：

所需的防伪cookie“ __RequestVerificationToken_L0NpdTpLaW5nMTZNVkM10”不存在。

控制器

/// <summary>
/// Delete 
/// </summary>
public ActionResult Delete(int Id)
{
    // Get place from Id
    var poll = PollRepo.Select(Id);

    if (poll == null)
        return HttpNotFound();

    return View(poll);
}

/// <summary>
/// Confirm Delete
/// </summary>
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(int Id)
{
    // Delete poll by Id from db
    PollRepo.Delete(Id);

    // Redirect to index
    TempData["message"] = "Poll Deleted";
    return RedirectToAction("Index");
}

看法

    <dd>
        @Html.DisplayFor(model => model.Abc)
    </dd>

</dl>

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()

    <div class="form-actions">
        <input type="submit" value="Delete" class="btn btn-default" /> |
        @Html.ActionLink("Back to List", "Index")
    </div>
}

在生成的HTML页面中

<form action="/MyApp/MyCont/MyAct/Delete/7" method="post"><input name="__RequestVerificationToken" type="hidden" value="JYMlRqNTUF6eoagnN6k7GrC1mJLKs1HDU4RCY_5_MEh2sIoJtumYEiM4LQF2BcKrf881xm-zdRU-KwBt381L9vBhuEJRLnMJY8aEgjVvdd41" /> 

当我按下删除按钮时，错误返回。