把“~/niunantest.aspx”转成"http://localhost:4532/test/niunantest.aspx"的方法

.NET中有个mappath方法是转成物理路径的，但是我却找不到现成的方法转成虚拟路径，自己写了一个，以做备用！

    /// <summary>把~/niunantest.aspx转化成http://localhost:3212/ModuleTest/niunantest.aspx
    /// 
    /// </summary>
    /// <param name="path">如：~/niunantest.aspx</param>
    /// <returns></returns>
    public static string GetVirsualURL(string path)
    {
        path = path.Replace("~","");
        HttpRequest request = HttpContext.Current.Request;
        string port = request.Url.Port == 80 ? "" : ":" + request.Url.Port.ToString();
        if (request.ApplicationPath == "/")
        {
            return @"http://" + request.Url.Host + port+path;
        }
        else
        {
            return @"http://" + request.Url.Host + port + request.ApplicationPath+path;
        }
    }