using System;using System.Text.RegularExpressions;namespace Helpers{    /// <summary>    /// 包含常用字符串的转换    /// </summary>    public static class StringEx    {        /// <summary>        /// 判断是否为空        /// </summary>        /// <param name="obj"></param>        /// <returns></returns>        public static bool IsNullOrEmpty(this string obj)        {            return string.IsNullOrEmpty(obj);        }        /// <summary>        /// 将字符串转换成整型数字        /// </summary>        /// <param name="obj"></param>        /// <param name="defaultValue">默认值</param>        /// <returns></returns>        public static int ToInt(this string obj, int defaultValue)        {            int result;            if (!Int32.TryParse(obj, out result))            {                result = defaultValue;            }            return result;        }        /// <summary>        /// 转化为float 类型        /// </summary>        /// <param name="obj"></param>        /// <param name="defaultValue">默认值</param>        /// <returns></returns>        public static float ToFloat(this string obj, float defaultValue)        {            float result;            if (!float.TryParse(obj, out result))            {                result = defaultValue;            }            return result;        }        /// <summary>        /// 转化为long 类型        /// </summary>        /// <param name="obj"></param>        /// <param name="defaultValue">默认值</param>        /// <returns></returns>        public static long ToLong(this string obj, long defaultValue)        {            long result;            if (!Int64.TryParse(obj, out result))            {                result = defaultValue;            }            return result;        }        /// <summary>        /// 转化为Double 类型        /// </summary>        /// <param name="obj"></param>        /// <param name="defaultValue">默认值</param>        /// <returns></returns>        public static double ToDouble(this string obj, double defaultValue)        {            double result;            if (!Double.TryParse(obj, out result))            {                result = defaultValue;            }            return result;        }        /// <summary>        /// 转化为Decimal 类型        /// </summary>        /// <param name="obj"></param>        /// <param name="defaultValue">默认值</param>        /// <returns></returns>        public static decimal ToDecimal(this string obj, decimal defaultValue)        {            decimal result;            if (!decimal.TryParse(obj, System.Globalization.NumberStyles.Float, null, out result))            {                result = defaultValue;            }            return result;        }        /// <summary>        /// 转换为DateTime        /// </summary>        /// <param name="obj"></param>        /// <param name="defaultValue">默认值</param>        public static DateTime ToDateTime(this string obj, DateTime defaultValue)        {            DateTime result;            if (!DateTime.TryParse(obj, out result))            {                result = defaultValue;            }            return result;        }        /// <summary>        /// 分割字符串        /// </summary>        /// <param name="target">原字符</param>        /// <param name="splitChars">分割符</param>        /// <returns></returns>        public static string[] Split(this string target, string splitChars)        {            return Regex.Split(target, splitChars, RegexOptions.IgnoreCase);        }        /// <summary>        /// 字符串的格式化        /// </summary>        /// <param name="format"></param>        /// <param name="args"></param>        /// <returns></returns>        public static string FormatNewStr(this string format, params object[] args)        {            return string.Format(format, args);        }    }}