在Visual Studio Windows Azure模拟器下运行ASP.NET MVC应用程序时创建正确的绝对URL

I need to create an absolute URL to specific files in my ASP.NET MVC 4 application. I am currently doing this by generating a relative path via Url.Content and then using the following extension method to create the absolute path.

我需要在ASP.NET MVC 4应用程序中创建特定文件的绝对URL。我目前正在通过Url.Content生成相对路径，然后使用以下扩展方法创建绝对路径。

public static string Absolute(this UrlHelper url, string relativeUrl)
{
    var request = url.RequestContext.HttpContext.Request;
    return string.Format("{0}://{1}{2}{3}", 
        (request.IsSecureConnection) ? "https" : "http", 
        request.Url.Host, 
        (request.Url.Port == 80) ? "" : ":" + request.Url.Port, 
        VirtualPathUtility.ToAbsolute(relativeUrl));
}

When running under the Azure Emulator, the proper URL that I need to create is http://127.0.0.1/myfile.jpg but when this code executes, the port number comes back as 81 so the URL that is generated is http://127:0.0.1:81/myfile.jpg. However, if I go to http://127:0.0.1:81/myfile.jpg it of course doesn't work as the Azure Emulator is listening on port 80, not 81.

在Azure模拟器下运行时，我需要创建的正确URL是http://127.0.0.1/myfile.jpg但是当执行此代码时，端口号将返回81，因此生成的URL为http：/ /127:0.0.1:81/myfile.jpg。但是，如果我转到http：// 127：0.0.1：81 / myfile.jpg，它当然不起作用，因为Azure模拟器正在侦听端口80，而不是81。

I assume this has to do with the built in Azure Emulator/IIS Express load balancer, but I am not sure what change I need to make to my Url.Absolute method to return an accurate URL.

我认为这与内置的Azure Emulator / IIS Express负载均衡器有关，但我不确定我需要对我的Url.Absolute方法做出哪些更改才能返回准确的URL。

3 个解决方案

#1

You can rely on the Host header that is being sent by the client:

您可以依赖客户端发送的主机头：

public static string Absolute(this UrlHelper url, string relativeUrl)
{
    var request = url.RequestContext.HttpContext.Request;

    return string.Format("{0}://{1}{2}",
        (request.IsSecureConnection) ? "https" : "http",
        request.Headers["Host"],
        VirtualPathUtility.ToAbsolute(relativeUrl));
}

#2

Why not just use @Url.Content("~/myfile.jpg");? This converts a virtual (relative) path to an application absolute path and works finle in IIS,the emulator and when deployed. See UrlHelper.Content Method

为什么不使用@ Url.Content（“〜/ myfile.jpg”）;?这会将虚拟（相对）路径转换为应用程序绝对路径，并在IIS，模拟器和部署时运行finle。请参阅UrlHelper.Content方法

#3

I've written a summary post that shows all the options here: http://benjii.me/2015/05/get-the-absolute-uri-from-asp-net-mvc-content-or-action/

我写了一篇摘要帖子，其中显示了所有选项：http：//benjii.me/2015/05/get-the-absolute-uri-from-asp-net-mvc-content-or-action/

The quick and simple answer is this:

快速简单的答案是这样的：

var urlBuilder =
    new System.UriBuilder(Request.Url.AbsoluteUri)
        {
            Path = Url.Content("~/path/to/anything"),
            Query = null,
        };

string url = urlBuilder.ToString();

#1