/// 
          /// Md5加密        /// 
          /// 待加密字串          /// 16或32值之一,其它则采用.net默认MD5加密算法          /// 
      
       加密后的字串
                public static string MD5Encrypt(string strSource, int length = 0)        {            byte[] bytes = Encoding.UTF8.GetBytes(strSource);            byte[] hashValue = ((System.Security.Cryptography.HashAlgorithm)System.Security.Cryptography.CryptoConfig.CreateFromName("MD5")).ComputeHash(bytes);            StringBuilder sb = new StringBuilder();            switch (length)            {                case 16:                    for (int i = 4; i < 12; i++)                        sb.Append(hashValue[i].ToString("x2"));                    break;                case 32:                    for (int i = 0; i < 16; i++)                    {                        sb.Append(hashValue[i].ToString("x2"));                    }                    break;                default:                    for (int i = 0; i < hashValue.Length; i++)                    {                        sb.Append(hashValue[i].ToString("x2"));                    }                    break;            }            return sb.ToString();        }

/// 
        /// 隐藏手机号中间4位        /// 
        ///         /// 
              public static string ParserMobile(string mobile)        {            if (string.IsNullOrEmpty(mobile)) return string.Empty;            if (mobile.Length != 11) return mobile;            var start = mobile.Substring(0, 3);            var end = mobile.Substring(mobile.Length - 4, 4);            return string.Format("{0}****{1}", start, end);        }

/// 
        /// 格式化QueryString        /// 
        ///         /// 
              public static NameValueCollection PaserToKeyValue(string queryString)        {            try            {                var coll = System.Web.HttpUtility.ParseQueryString(queryString);                return coll;            }            catch { }            return null;        }

/// 
        /// 字符串转Int        /// 
        ///         /// 
              public static int ToInt(string val)        {            int i;            int.TryParse(val,out i);            return i;        }

/// 
        /// 字符串转Int64        /// 
        ///         /// 
              public static long ToInt64(string val)        {            long v;            if (!long.TryParse(val, out  v))            {                v = 0;            }            return v;        }

/// 
        /// 字符串转Int?        /// 
        ///         /// 
              public static int? ToNullInt(string val)        {            int? i;            try            {                i = Convert.ToInt32(val);            }            catch            {                i = null;            }            return i;        }

/// 
        /// HtmlToStr        /// 
        ///         ///         /// 
              public static string HtmlToString(string htmlstring, string replaceto = " ")        {            if (string.IsNullOrEmpty(htmlstring)) return string.Empty;            //删除脚本               htmlstring =                Regex.Replace(htmlstring, @"
      
       ]*?>.*?",                "", RegexOptions.IgnoreCase);            //删除HTML               htmlstring = Regex.Replace(htmlstring, @"<(.[^>]*)>", "", RegexOptions.IgnoreCase);            htmlstring = Regex.Replace(htmlstring, @"([\r\n])[\s]+", "", RegexOptions.IgnoreCase);            htmlstring = Regex.Replace(htmlstring, @"-->", "", RegexOptions.IgnoreCase);            htmlstring = Regex.Replace(htmlstring, @"
       
      

/// 
        /// 替换字符        /// 
        ///         ///         ///         /// 
              public static string Replace(string str, int length, string endstr = "...")        {            if (!string.IsNullOrEmpty(str))            {                if (str.Length > length)                {                    str = str.Substring(0, length) + endstr;                }            }            return str;        }

/// 
        /// 查询Config值        /// 
        /// 
              ///         /// 
              public static T GetAppSetting
      
       (string key)        {            try            {                var val = ConfigurationManager.AppSettings[key];                return StringHelper.ChangeType
       
        (val);            }            catch            {                return default(T);            }        }
       
      

/// 
        /// 更改类型        /// 
        /// 
              ///         /// 
              public static T ChangeType
      
       (object v)        {            try            {                return (T)Convert.ChangeType(v, typeof(T));            }            catch            {                return default(T);            }        }