如何在 Global.aspx 的 Application_Start 中获取完整的主机名 + 端口号? [英] How to get full host name + port number in Application_Start of Global.aspx?

问题描述

我试过了

Uri uri = HttpContext.Current.Request.Url;
String host = uri.Scheme + Uri.SchemeDelimiter + uri.Host + ":" + uri.Port;

它在我的本地机器上运行良好，但是当发布到 IIS7 时，有一个异常说

and it worked well on my local machine, but when being published to IIS7, there is an exception saying

System.Web.HttpException: Request is not available in this context

有人知道如何实现吗?

推荐答案

当您的 Web 应用程序启动时，没有处理 HTTP 请求.

When your web application starts, there is no HTTP request being handled.

您可能想要处理定义 Application_BeginRequest(Object Sender, EventArgs e) 方法，其中请求上下文可用.

You may want to handle define the Application_BeginRequest(Object Sender, EventArgs e) method in which the the Request context is available.

这是一个受 Michael Shimmins 链接到的 Mike Volodarsky 博客启发的代码示例:

Here is a code sample inspired by the Mike Volodarsky's blog that Michael Shimmins linked to:

    void Application_BeginRequest(Object source, EventArgs e)
    {
        HttpApplication app = (HttpApplication)source;
        var host = FirstRequestInitialisation.Initialise(app.Context);
    }

    static class FirstRequestInitialisation
    {
        private static string host = null;
        private static Object s_lock = new Object();

        // Initialise only on the first request
        public static string Initialise(HttpContext context)
        {
            if (string.IsNullOrEmpty(host))
            {
                lock (s_lock)
                {
                    if (string.IsNullOrEmpty(host))
                    {
                        var uri = context.Request.Url;
                        host = uri.GetLeftPart(UriPartial.Authority);
                    }
                }
            }

            return host;
        }
    }

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