Asp.net QueryString批量插入和更新

public static string InsertOrUpdateQueryString(string[] keys, string[] values)
        {
            return InsertOrUpdateQueryString(System.Web.HttpContext.Current.Request, keys, values);
        }

        public static string InsertOrUpdateQueryString(System.Web.HttpRequest request, string[] keys, string[] values)
        {
            string keyValue;
            string keyCurrent;

            System.Text.StringBuilder pathBuilder = new System.Text.StringBuilder(request.Path);
            pathBuilder.Append("?");
            int handedCount = ;
            if (request.QueryString.HasKeys())
            {
                for (var i = ; i < request.QueryString.AllKeys.Length;i++ )
                {
                    keyValue = request.QueryString.AllKeys[i];
                    if (string.IsNullOrEmpty(keyValue))
                    {
                        continue;
                    }

                    if (Array.IndexOf<string>(keys, keyValue) != -)
                    {
                        continue;
                    }
                    keyCurrent = request.QueryString[i];

                    if (string.IsNullOrEmpty(keyValue))
                    {
                        continue;
                    }

                    if (i != )
                    {
                        pathBuilder.AppendFormat("&{0}={1}", keyValue, keyCurrent);
                    }
                    else
                    {
                        pathBuilder.AppendFormat("{0}={1}", keyValue, keyCurrent);
                    }
                    handedCount++;
                }
            }
            for (var i = ; i < keys.Length; i++)
            {
                keyValue = keys[i];
                keyCurrent = values[i];
                if (string.IsNullOrEmpty(keyValue) || string.IsNullOrEmpty(keyCurrent))
                {
                    continue;
                }
                if (handedCount++ != )
                {
                    pathBuilder.AppendFormat("&{0}={1}", keyValue,keyCurrent);
                }
                else
                {
                    pathBuilder.AppendFormat("{0}={1}", keyValue, keyCurrent);
                }
            }
            return pathBuilder.ToString();
        }