问题描述

在集成模式下使用 HttpContext.Current.Request.ServerVariables["SERVER_NAME"] 会在 IIS7 中出现错误:http://mvolo.com/blogs/serverside/archive/2007/11/10/Integrated-mode-Request-is-not-available-in-this-context-in-Application_5F00_Start.aspx

Using HttpContext.Current.Request.ServerVariables["SERVER_NAME"] in integrated mode gives an error in IIS7 as per: http://mvolo.com/blogs/serverside/archive/2007/11/10/Integrated-mode-Request-is-not-available-in-this-context-in-Application_5F00_Start.aspx

我可以在 global.asax 代码中使用 HttpContext.Current.Request.ServerVariables["SERVER_NAME"] 的替代品吗?

Is there a replacement I can use in global.asax code for HttpContext.Current.Request.ServerVariables["SERVER_NAME"]?

这类似于使用

String strPath = 
HttpContext.Current.Server.MapPath(HttpRuntime.AppDomainAppVirtualPath);

而不是

//String strPath = 
HttpContext.Current.Server.MapPath(HttpContext.Current.Request.ServerVariables["PATH_INFO"]);

推荐答案

由于在应用程序启动期间管道中不再有请求上下文，我无法想象有什么方法可以猜测下一个实际请求可能来自哪个服务器/端口中.

Since there's no Request context in the pipeline during app start anymore, I can't imagine there's any way to guess what server/port the next actual request might come in on.

这是我在不处于经典模式时使用的.开销可以忽略不计.

Here's what I'm using when not in Classic Mode. The overhead is negligible.

/// <summary>
/// Class is called only on the first request
/// </summary>
private class AppStart
{
    static bool _init = false;
    private static Object _lock = new Object();

    /// <summary>
    /// Does nothing after first request
    /// </summary>
    /// <param name="context"></param>
    public static void Start(HttpContext context)
    {
        if (_init)
        {
            return;
        }
        //create class level lock in case multiple sessions start simultaneously
        lock (_lock)
        {
            if (!_init)
            {
                string server = context.Request.ServerVariables["SERVER_NAME"];
                string port = context.Request.ServerVariables["SERVER_PORT"];
                HttpRuntime.Cache.Insert("basePath", "http://" + server + ":" + port + "/");
            }
        }
    }
}

protected void Session_Start(object sender, EventArgs e)
{
    //initializes Cache on first request
    AppStart.Start(HttpContext.Current);
}

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