得到Request.QueryString所有参数的键值

 string str = "";
            int num = 0;
            System.Text.StringBuilder sb = new System.Text.StringBuilder();
            num = Request.QueryString.Count;
            sb.AppendLine("共有"+num.ToString()+"个参数<br/>");
            foreach(string key in Request.QueryString.AllKeys)
            ...{
                sb.AppendLine(string.Format("Key={0}&nbsp;&nbsp;&nbsp;Value={1}<br/>", key, Request.QueryString[key]));
            }
            Response.Write(sb.ToString());