对于一个绝对的基本URL使用这个。同时支持HTTP和HTTPS。

new Uri(Request.Url, Url.Content("~"))

在。net core 3.1中，我使用了这种方法:

$"{Request.Scheme}://{Request.Host}{Url.Content("~/")}"

对于MVC 4:

String.Format("{0}://{1}{2}", Url.Request.RequestUri.Scheme, Url.Request.RequestUri.Authority, ControllerContext.Configuration.VirtualPathRoot);

简单地在一行中获取BaseUrl

string baseUrl = new Uri(Request.Url, Url.Content("~")).AbsoluteUri;

//output example: https://stackoverflow.com

对于url的应用程序别名，如http://example.com/appAlias/…你可以试试这个:

var req = HttpContext.Current.Request;
string baseUrl = string.Format("{0}://{1}/{2}", req.Url.Scheme, req.Url.Authority, req.ApplicationPath);

这是一个asp.net属性到MVC的转换。这是一个很好的方法。

声明一个helper类:

namespace MyTestProject.Helpers
{
    using System.Web;

    public static class PathHelper
    {
        public static string FullyQualifiedApplicationPath(HttpRequestBase httpRequestBase)
        {
            string appPath = string.Empty;

            if (httpRequestBase != null)
            {
                //Formatting the fully qualified website url/name
                appPath = string.Format("{0}://{1}{2}{3}",
                            httpRequestBase.Url.Scheme,
                            httpRequestBase.Url.Host,
                            httpRequestBase.Url.Port == 80 ? string.Empty : ":" + httpRequestBase.Url.Port,
                            httpRequestBase.ApplicationPath);
            }

            if (!appPath.EndsWith("/"))
            {
                appPath += "/";
            }

            return appPath;
        }
    }
}

用法:

从控制器使用:

PathHelper.FullyQualifiedApplicationPath(ControllerContext.RequestContext.HttpContext.Request)

在视图中使用:

@using MyTestProject.Helpers

PathHelper.FullyQualifiedApplicationPath(Request)