asp.net 获得域名,端口,虚拟目录

记性不好,好多次都被路径问题给拦住了.我现在想得到一个资源的全URL路径,因此首先想得到网站当前的域名,端口和虚拟目录.看下表

底下這張表就是各種跟 Browser Request 的網址相關的屬性與用法：

網址：http://localhost:1897/News/Press/Content.aspx/123?id=1#toc
Request.ApplicationPath	/
Request.PhysicalPath	D:\Projects\Solution\web\News\Press\Content.aspx
System.IO.Path.GetDirectoryName(Request.PhysicalPath)	D:\Projects\Solution\web\News\Press
Request.PhysicalApplicationPath	D:\Projects\Solution\web\
System.IO.Path.GetFileName(Request.PhysicalPath)	Content.aspx
Request.CurrentExecutionFilePath	/News/Press/Content.aspx
Request.FilePath	/News/Press/Content.aspx
Request.Path	/News/Press/Content.aspx/123
Request.RawUrl	/News/Press/Content.aspx/123?id=1
Request.Url.AbsolutePath	/News/Press/Content.aspx/123
Request.Url.AbsoluteUri	http://localhost:1897/News/Press/Content.aspx/123?id=1
Request.Url.Scheme	http
Request.Url.Host	localhost
Request.Url.Port	1897
Request.Url.Authority	localhost:1897
Request.Url.LocalPath	/News/Press/Content.aspx/123
Request.PathInfo	/123
Request.Url.PathAndQuery	/News/Press/Content.aspx/123?id=1
Request.Url.Query	?id=1
Request.Url.Fragment
Request.Url.Segments	/ News/ Press/ Content.aspx/ 123

这里并没有得到域名的方法.还是只好拆分字符串了,我是这么做的:

        protected string GetBaseUrl()
        {
            return Request.Url.AbsoluteUri.Substring(0, Request.Url.AbsoluteUri.IndexOf(Request.RawUrl));
        }

       var fullImgUrl = GetBaseUrl() + "/Views/Images.ashx?id=" + map;

不知是否有更好的方法得到?