/// 
    /// 数据转换扩展类型    /// 
    public static class DataConvertExtend    {        /// 
        /// 对象转成字符        /// 
        /// 对象        /// 
      
       字符
              public static string DataToString(this object obj)        {            if (obj == null || obj == DBNull.Value)            {                return string.Empty;            }            return obj.ToString();        }        /// 
        /// 对象转成整型        /// 
        /// 对象        /// 
      
       整型
              public static int DataToInt(this object obj)        {            if (obj == null || obj == DBNull.Value)            {                return 0;            }            int data = int.MinValue;            if (int.TryParse(obj.ToString(), out data) == false)            {                return 0;            }            return data;        }        /// 
        /// 对象转换成整型        /// 
        /// 对象        /// 
      
       整型
              public static int? DataToIntMark(this object obj)        {            if (obj == null || obj == DBNull.Value)            {                return null;            }            int data = int.MinValue;            if (int.TryParse(obj.ToString(), out data) == false)            {                return null;            }            return data;        }        /// 
        /// 对象转成Float        /// 
        /// 对象        /// 
      
       Float
              public static float DataToFloat(this object obj)        {            if (obj == null || obj == DBNull.Value)            {                return 0;            }            float data = float.MinValue;            if (float.TryParse(obj.ToString(), out data) == false)            {                return 0;            }            return data;        }        /// 
        /// 对象转换成Float        /// 
        /// 对象        /// 
      
       Float
              public static float? DataToFloatMark(this object obj)        {            if (obj == null || obj == DBNull.Value)            {                return null;            }            float data = float.MinValue;            if (float.TryParse(obj.ToString(), out data) == false)            {                return null;            }            return data;        }        /// 
        /// 对象转成double        /// 
        /// 对象        /// 
      
       double
              public static double DataToDouble(this object obj)        {            if (obj == null || obj == DBNull.Value)            {                return 0;            }            double data = double.MinValue;            if (double.TryParse(obj.ToString(), out data) == false)            {                return 0;            }            return data;        }        /// 
        /// 对象转换成double        /// 
        /// 对象        /// 
      
       double
              public static double? DataToDoubleMark(this object obj)        {            if (obj == null || obj == DBNull.Value)            {                return null;            }            double data = double.MinValue;            if (double.TryParse(obj.ToString(), out data) == false)            {                return null;            }            return data;        }        /// 
        /// 对象转成浮点类型        /// 
        /// 对象        /// 
      
       浮点类型
              public static decimal DataToDecimal(this object obj)        {            if (obj == null || obj == DBNull.Value)            {                return 0;            }            decimal data = decimal.MinValue;            if (decimal.TryParse(obj.ToString(), out data) == false)            {                return 0;            }            return data;        }        /// 
        /// 对象转换成浮点类型        /// 
        /// 对象        /// 
      
       浮点类型
              public static decimal? DataToDecimalMark(this object obj)        {            if (obj == null || obj == DBNull.Value)            {                return null;            }            decimal data = decimal.MinValue;            if (decimal.TryParse(obj.ToString(), out data) == false)            {                return null;            }            return data;        }        /// 
        /// 对象转换成日期类型        /// 
        /// 对象        /// 
      
       日期
              public static DateTime DataToDateTime(this object obj)        {            if (obj == null || obj == DBNull.Value)            {                return DateTime.MinValue;            }            DateTime date = DateTime.MinValue;            if (DateTime.TryParse(obj.ToString(), out date) == false)            {                return date;            }            return date;        }        /// 
        /// 对象转换成时间类型        /// 
        /// 对象        /// 
      
       时间
              public static DateTime DataToTime(this object obj)        {            DateTime date = DateTime.ParseExact("00:00:00", "HH:mm:ss", null);            if (obj == null || obj == DBNull.Value)            {                return date;            }            if (DateTime.TryParse(obj.ToString(), out date) == false)            {                date = DateTime.ParseExact(obj.ToString(), "HH:mm:ss", null);            }            return date;        }        /// 
        /// 对象转换成日期类型        /// 
        /// 对象        /// 
      
       日期
              public static DateTime? DataToDateTimeMark(this object obj)        {            if (obj == null || obj == DBNull.Value)            {                return null;            }            DateTime date = DateTime.MinValue;            if (DateTime.TryParse(obj.ToString(), out date) == false)            {                return null;            }            return date;        }    }