微博地址url(id)与mid的相互转换

        /// 
 /// 从一条新浪微博地址中获取这条微博的id /// 
 /// 一条微博地址 /// 微博id public static string GetIdFromUrl(string url)
        { string mid = GetMidFromUrl(url); if (string.IsNullOrEmpty(mid))
            { return string.Empty;
            } else { return Mid2Id(mid);
            }
        } /// 
 /// 从一条新浪微博地址中获取这条微博的mid /// 
 /// 一条微博地址 /// 微博mid public static string GetMidFromUrl(string url)
        { if (string.IsNullOrEmpty(url))
            { return "";
            } if (url.IndexOf('?') != -1)
            {
                url = url.Substring(0, url.IndexOf('?'));
            }
            Regex reg = new Regex(@"^http://(e\.)?weibo\.com/[0-9a-zA-Z]+/(?[0-9a-zA-Z]+)$", RegexOptions.IgnoreCase);
            Match match = reg.Match(url); if (match.Success)
            { return match.Result("${id}");
            } return "";
        } /// 
 /// 将新浪微博mid转换成id /// 
 /// 微博mid /// 返回微博的id public static string Mid2Id(string mid)
        { string id = ""; for (int i = mid.Length - 4; i > -4; i = i - 4) //从最后往前以4字节为一组读取URL字符  { int offset1 = i <0 ? 0 : i; int len = i <0 ? mid.Length % 4 : 4; var str = mid.Substring(offset1, len);

                str = Str62toInt(str); if (offset1 > 0) //若不是第一组，则不足7位补0  { while (str.Length <7)
                    {
                        str = "0" + str;
                    }
                }
                id = str + id;
            } return id;
        } /// 
 /// 新浪微博id转换为mid /// 
 /// 微博id /// 返回微博的mid public static string Id2Mid(string id)
        { string mid = "", strTemp; int startIdex, len; for (var i = id.Length - 7; i > -7; i = i - 7) //从最后往前以7字节为一组读取mid  {
                startIdex = i <0 ? 0 : i;
                len = i <0 ? id.Length % 7 : 7;
                strTemp = id.Substring(startIdex, len);
                mid = IntToStr62(Convert.ToInt32(strTemp)) + mid;
            } return mid;
        } //62进制转成10进制 public static string Str62toInt(string str62)
        {
            Int64 i64 = 0; for (int i = 0; i  61) return ""; return str62keys.Substring(int10, 1);
        }

http://api.t.sina.com.cn/queryid.json?mid=z8ElgBLeQ&isBase62=1&type=1 返回
{"id":"3520617028999724"}

http://api.t.sina.com.cn/querymid.json?id=3520617028999724 返回
{"mid":"z8ElgBLeQ"}