c# - ASP.NET MVC 查询在未请求时部署了应用程序服务器地址

Question

这个问题看起来像another question不是吗？略有不同。我想在初始设置时(在应用程序启动时)知道服务器的部署地址，那时没有请求:

HttpContext.Current.Request

所以我无法查询它来获取当前 URL。还有别的办法吗？

Answer 1

检查 HostingEnvironment类(class)。您也可以查看 following article如果您需要的信息不在 HostingEnvironment 类中。在这篇文章中，作者在 Application_BeginRequest 方法而不是 Application_Start 中执行初始化逻辑。它使用锁来确保此初始化只执行一次:

void Application_BeginRequest(Object source, EventArgs e)
{

    HttpApplication app = (HttpApplication)source;
    HttpContext context = app.Context;

    // Attempt to peform first request initialization

    FirstRequestInitialization.Initialize(context);
} 

这是 FirstRequestInitialization 类:

class FirstRequestInitialization
{
    private static bool s_InitializedAlready = false;
    private static Object s_lock = new Object();

    // Initialize only on the first request

    public static void Initialize(HttpContext context)
    {
        if (s_InitializedAlready)
        {
            return;
        }

        lock (s_lock)
        {
            if (s_InitializedAlready)
            {
                return;
            }

            // Perform first-request initialization here ...

            s_InitializedAlready = true;
        }
    }
}