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string absolutePath = HttpContext.Current.Request.Url.AbsoluteUri;
string hostNameAndPort = HttpContext.Current.Request.Url.Authority;
string applicationDir = HttpContext.Current.Request.ApplicationPath;
StringBuilder sbRequestUrl = new StringBuilder();
sbRequestUrl.Append(absolutePath.Substring(0, absolutePath.IndexOf(hostNameAndPort)));
sbRequestUrl.Append(hostNameAndPort);
sbRequestUrl.Append(applicationDir);
sbRequestUrl就是,不管你在那个文件里用都一样