web中绝对路径换虚拟路径

最近在做一个web项目，将图片上传到服务器后，再访问时拿到的是绝对路劲，而需要的是虚拟路劲。经过一番折腾找到了下列方法可以直接转换。

 /// <summary>
        /// 将Web站点下的绝对路径转换为虚拟路径
        /// 注：非Web站点下的则不转换
        /// </summary>
        /// <param name="page">当前页面指针，一般为this</param>
        /// <param name="specifiedPath">绝对路径</param>
        /// <returns>虚拟路径, 型如: ~/</returns>
        public static string ConvertSpecifiedPathToRelativePath(Page page, string specifiedPath)

        {
            string virtualPath = page.Request.ApplicationPath;

            string pathRooted = HostingEnvironment.MapPath(virtualPath);

            if (!Path.IsPathRooted(specifiedPath) || specifiedPath.IndexOf(pathRooted) == -1)
            {
                return specifiedPath;
            }

            if (pathRooted.Substring(pathRooted.Length - 1, 1) == "\")
            {
                specifiedPath = specifiedPath.Replace(pathRooted, "~/");
            }
            else
            {
                specifiedPath = specifiedPath.Replace(pathRooted, "~");
            }
            string relativePath = specifiedPath.Replace("\", "/").Substring(1, specifiedPath.Length - 1);
            return relativePath;
        }

备注:  string relativePath = specifiedPath.Replace("\", "/").Substring(1, specifiedPath.Length - 1); 里面的 Substring(1, specifiedPath.Length - 1)是我自己加的。根据自己需求。原来是string relativePath = specifiedPath.Replace("\", "/");