using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;

namespace Infrastructure
{
 /// <summary>
 /// 常用公共类
 /// </summary>
 public class CommonHelper
 {
 #region Stopwatch计时器
 /// <summary>
 /// 计时器开始
 /// </summary>
 /// <returns></returns>
 public static Stopwatch TimerStart()
 {
 Stopwatch watch = new Stopwatch();
 watch.Reset();
 watch.Start();
 return watch;
 }
 /// <summary>
 /// 计时器结束
 /// </summary>
 /// <param name="watch"></param>
 /// <returns></returns>
 public static string TimerEnd(Stopwatch watch)
 {
 watch.Stop();
 double costtime = watch.ElapsedMilliseconds;
 return costtime.ToString();
 }
 #endregion

 #region 删除数组中的重复项
 /// <summary>
 /// 删除数组中的重复项
 /// </summary>
 /// <param name="values"></param>
 /// <returns></returns>
 public static string[] RemoveDup(string[] values)
 {
 List<string> list = new List<string>();
 for (int i = 0; i < values.Length; i++)//遍历数组成员
 {
 if (!list.Contains(values[i]))
 {
 list.Add(values[i]);
 };
 }
 return list.ToArray();
 }
 #endregion

 #region 自动生成日期编号
 /// <summary>
 /// 自动生成编号 201008251145409865
 /// </summary>
 /// <returns></returns>
 public static string CreateNo()
 {
 Random random = new Random();
 string strRandom = random.Next(1000, 10000).ToString(); //生成编号 
 string code = DateTime.Now.ToString("yyyyMMddHHmmss") + strRandom;//形如
 return code;
 }
 #endregion

 #region 生成0-9随机数
 /// <summary>
 /// 生成0-9随机数
 /// </summary>
 /// <param name="codeNum">生成长度</param>
 /// <returns></returns>
 public static string RndNum(int codeNum)
 {
 StringBuilder sb = new StringBuilder(codeNum);
 Random rand = new Random();
 for (int i = 1; i < codeNum + 1; i++)
 {
 int t = rand.Next(9);
 sb.AppendFormat("{0}", t);
 }
 return sb.ToString();

 }
 #endregion

 #region 删除最后一个字符之后的字符
 /// <summary>
 /// 删除最后结尾的一个逗号
 /// </summary>
 public static string DelLastComma(string str)
 {
 return str.Substring(0, str.LastIndexOf(","));
 }
 /// <summary>
 /// 删除最后结尾的指定字符后的字符
 /// </summary>
 public static string DelLastChar(string str, string strchar)
 {
 return str.Substring(0, str.LastIndexOf(strchar));
 }
 /// <summary>
 /// 删除最后结尾的长度
 /// </summary>
 /// <param name="str"></param>
 /// <param name="Length"></param>
 /// <returns></returns>
 public static string DelLastLength(string str, int Length)
 {
 if (string.IsNullOrEmpty(str))
 return "";
 str = str.Substring(0, str.Length - Length);
 return str;
 }
 #endregion
 }
}