String字符串工具类

字符串类(StringUtil.cs)#

using System;

namespace Sam.OA.Common
{
    /// <summary>
    /// 字符处理工具类
    /// 作者：陈彦斌
    /// 更新时间：2019年9月11日00:07:11
    /// </summary>
    [Serializable]
    public static class StringUtil
    {
        /// <summary>
        /// 判断字符对象为null或者为""
        /// </summary>
        /// <param name="obj">字符对象</param>
        /// <returns></returns>
        public static bool isNullOrBlank(Object obj)
        {
            if (obj == null || obj.ToString().ToLower() == "null" || obj == DBNull.Value || obj.ToString().Trim() == "" || obj.ToString() == "undefined" || obj.ToString().Equals(decimal.MinValue.ToString()))
                return true;
            else
                return false;
        }
        /// <summary>
        /// 处理字符串
        /// </summary>
        /// <param name="obj">字符串</param>
        /// <returns></returns>
        public static string ProcessString(object obj)
        {
            return isNullOrBlank(obj) ? "null" : "'" + obj.ToString().Replace("--", "") + "'";
        }
        /// <summary>
        /// 判断字符串是否为日期
        /// </summary>
        /// <param name="strDate">日期字符串</param>
        /// <returns></returns>
        public static bool ObjectIsDate(object strDate)
        {
            try
            {
                DateTime.Parse(ProcessString(strDate));
                return true;
            }
            catch
            {
                return false;
            }
        }
        /// <summary>
        /// 判断字符串是否为decimal
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static bool IsDecimal(object obj)
        {
            try
            {
                decimal.Parse(obj.ToString().Trim());
                return true;
            }
            catch
            {
                return false;
            }
        }
        /// <summary>
        /// 对象是否为Null并返回三元运算符值
        /// </summary>
        /// <param name="obj">对象</param>
        /// <returns></returns>
        public static string ObjectIsNull(string obj)
        {
            try
            {
                return obj == null ? "" : obj.Replace(" ", "");
            }
            catch (Exception ex)
            {
                return "";
            }
        }
        /// <summary>
        /// 对象是否为空并返回三元运算符值
        /// </summary>
        /// <param name="obj">对象</param>
        /// <returns></returns>
        public static string ObjectIsBlank(string obj)
        {
            try
            {
                return obj.Replace(" ", "") == "" ? "" : obj.Replace(" ", "");
            }
            catch (Exception ex)
            {
                return "";
            }
        }
        /// <summary>
        /// 对象是否为Decimal并返回三元运算符值
        /// </summary>
        /// <param name="obj">对象</param>
        /// <returns></returns>
        public static decimal ObjectIsDecimal(object obj)
        {
            try
            {
                return Convert.ToDecimal(obj.ToString().Replace(" ", "") == "" ? "0" : obj);
            }
            catch (Exception ex)
            {
                return 0;
            }
        }
        /// <summary>
        /// 获取当前月的第一天
        /// </summary>
        /// <returns></returns>
        public static DateTime GetFirstDayCurrentMonth()
        {
            try
            {
                return DateTime.Now.AddDays(1 - DateTime.Now.Day).Date;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        /// <summary>
        /// 获取当前月的最后一天
        /// </summary>
        /// <returns></returns>
        public static DateTime GetLastDayCurrentMonth()
        {
            try
            {
                return DateTime.Now.AddDays(-DateTime.Now.Day).Date.AddMonths(1);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        /// <summary>
        /// 获取指定日期，在为一年中为第几周
        /// </summary>
        /// <param name="dtWeek">指定时间</param>
        /// <reutrn>返回第几周,1-52周</reutrn>
        private static int GetWeekOfYear(DateTime dtWeek)
        {
            System.Globalization.GregorianCalendar gc = new System.Globalization.GregorianCalendar();
            int weekOfYear = gc.GetWeekOfYear(dtWeek, System.Globalization.CalendarWeekRule.FirstDay, DayOfWeek.Monday);
            return weekOfYear;
        }
        /// <summary> 
        /// 计算某日起始日期（礼拜一的日期） 
        /// </summary> 
        /// <param name="someDate">该周中任意一天</param> 
        /// <returns>返回礼拜一日期，无时分秒</returns> 
        public static string GetMondayDate(DateTime someDate)
        {
            int i = someDate.DayOfWeek - DayOfWeek.Monday;
            if (i == -1) i = 6;// i值 > = 0 ，因为枚举原因，Sunday排在最前，此时Sunday-Monday=-1，必须+7=6。 
            TimeSpan ts = new TimeSpan(i, 0, 0, 0);
            return someDate.Subtract(ts).ToShortDateString();
        }
        /// <summary> 
        /// 计算某日结束日期（礼拜日的日期） 
        /// </summary> 
        /// <param name="someDate">该周中任意一天</param> 
        /// <returns>返回礼拜日日期，无时分秒</returns> 
        public static string GetSundayDate(DateTime someDate)
        {
            int i = someDate.DayOfWeek - DayOfWeek.Sunday;
            if (i != 0) i = 7 - i;// 因为枚举原因，Sunday排在最前，相减间隔要被7减。 
            TimeSpan ts = new TimeSpan(i, 0, 0, 0);
            return someDate.Add(ts).ToShortDateString();
        }
        /// <summary>
        /// 获取某月的天数
        /// </summary>
        /// <param name="someDate">日期</param>
        /// <returns>当月的天数</returns>
        public static int GetDaysInMonth(DateTime someDate)
        {
            return System.Threading.Thread.CurrentThread.CurrentUICulture.Calendar.GetDaysInMonth(someDate.Year, someDate.Month);
        }
    }
}