即使禁用会话，ASP.NET MVC 5 并发请求也会排队 [英] ASP.NET MVC 5 concurrent requests are queued even with disabled Session

问题描述

在考虑投反对票或告诉我谷歌它"之前，请更仔细地阅读问题.这是旧/经典问题，但旧/经典解决方案不再有效.这是在 Visual Studio 2013/2015 中重现的非常简单的场景:

Before thinking about downvoting or telling me "google it", please read the problem more carefully. This is old/classic problem but old/classic solution is no longer working. Here is very simple scenario to reproduce in Visual Studio 2013/2015:

1) 使用 MVC 模板创建 ASP.NET Web 应用程序:

1) Create ASP.NET Web application using MVC template:

2) 打开 ControllersHomeController.cs 并添加属性到控制器和睡眠"动作:

2) Open ControllersHomeController.cs and add attribute to controller and "Sleep" action:

[SessionState( System.Web.SessionState.SessionStateBehavior.Disabled)]
public class HomeController : Controller
{
    public ActionResult Sleep(int? time)
    {
        System.Threading.Thread.Sleep(time ?? 3000);
        return Content("OK");
    }

    public ActionResult Index()
    {
...

3) 打开文件:ViewsHomeIndex.cshtml 并使用以下内容添加/替换内容 html:

3) Open file: ViewsHomeIndex.cshtml and add/replace content html with the following :

<script>
    function ReqClick() {
        var startTime = Date();

        $.ajax("/Home/Sleep")
        .success(function () {
            var log = $("#log");
            var endTime = Date();
            log.text(log.text() + "Start: " + startTime.toString() + "  === " + endTime.toString());
        });
    };
</script>

<button type="button" onclick="ReqClick();">
    Request
</button>
<div>
    <textarea id="log" style="width:640px; height:480px"></textarea>
</div>

4) 运行它(使用 IIS 或 IIS Express 或 Vs Dev Server 无关紧要)- 打开主页/索引.点击 F12 打开开发工具，打开网络选项卡.在主页上快速单击请求"按钮两次.你可以看到第二个请求花费了将近 6 秒:

在控制器的调试模式下，您可以看到会话为空:

Cookie 完全为空(ASP.NET 会话 ID 不存在)

Please let me know what I'm missing?

请告诉我我遗漏了什么?

Adding the setting below to web.config does not help either:

将以下设置添加到 web.config 也无济于事:

<sessionState mode="Off"/>
<pages enableSessionState="ReadOnly"/>

推荐答案

当我用这个属性装饰我的控制器时，并发并行请求对我有用

Concurrent parallel requests worked for me when I decorated my controller with this attribute

[SessionState(System.Web.SessionState.SessionStateBehavior.ReadOnly)]

它比上述禁用会话状态效果更好，并在 MVC 3 中重新添加.更多信息在这里

It works better than the above disabling session state and was added back in MVC 3. More info here

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