using System;
namespace ConsoleApp1
{
public class CronHelper
{
/// <summary>
/// 解析成Cron表达式
/// </summary>
/// <param name="TaskType">任务类型 </param>
/// <param name="StartYear">开始日期</param>
/// <param name="EndYear">结束日期</param>
/// <param name="TaskTime">任务执行时间</param>
/// <param name="Condition">执行的条件</param>
/// /// <param name="Spacing">月计划具体执行的日期</param>
/// <returns></returns>
public static string ParseCron(TaskType TaskType, string StartDate, string EndDate, string TaskTime, string Condition="", string Spacing = "")
{
if (string.IsNullOrWhiteSpace(TaskTime))
{
return string.Empty;
}
//1.执行的年份
string TaskTimeStarYear = ""; //开始年份
string TaskTimeEndYear = ""; //结束年份
string TaskTimeYear = "*"; //任务执行的年份
if (!string.IsNullOrWhiteSpace(StartDate)) TaskTimeStarYear = (DateTime.Parse(StartDate).Year).ToString();
if (!string.IsNullOrWhiteSpace(EndDate)) TaskTimeEndYear = (DateTime.Parse(EndDate).Year).ToString();
if (!string.IsNullOrWhiteSpace(TaskTimeStarYear) && !string.IsNullOrWhiteSpace(TaskTimeStarYear)) //如果开始日期和结束日期都不为空
{
TaskTimeYear = TaskTimeStarYear + "-" + TaskTimeEndYear;
}
else if (string.IsNullOrWhiteSpace(TaskTimeStarYear) && !string.IsNullOrWhiteSpace(TaskTimeStarYear)) //如果只有结束日期，开始日期默认今天
{
TaskTimeYear = (DateTime.Now.Year).ToString() + "-" + TaskTimeEndYear;
}
else
{
TaskTimeYear = "*";
}
//1.执行的月份
string TaskTimeStarMonth = ""; //开始月份
string TaskTimeEndMonth = ""; //结束月份
string TaskTimeMonth = "*"; //任务执行的月份
if (!string.IsNullOrWhiteSpace(StartDate)) TaskTimeStarMonth = (DateTime.Parse(StartDate).Month).ToString();
if (!string.IsNullOrWhiteSpace(EndDate)) TaskTimeEndMonth = (DateTime.Parse(EndDate).Month).ToString();
if (!string.IsNullOrWhiteSpace(TaskTimeStarMonth) && !string.IsNullOrWhiteSpace(TaskTimeEndMonth)) //如果开始日期和结束日期都不为空
{
TaskTimeMonth = TaskTimeStarMonth + "-" + TaskTimeEndMonth;
}
else if (string.IsNullOrWhiteSpace(TaskTimeStarMonth) && !string.IsNullOrWhiteSpace(TaskTimeEndMonth)) //如果只有结束日期，开始日期默认今天
{
TaskTimeMonth = (DateTime.Now.Month).ToString() + "-" + TaskTimeEndMonth;
}
else
{
TaskTimeMonth = "*";
}
//2.执行的小时和分钟
DateTime dtTaskTime = DateTime.Parse(TaskTime);
string TaskTimeHour = (dtTaskTime.Hour).ToString(); //执行时间的小时
string TaskTimeMin = (dtTaskTime.Minute).ToString(); //执行时间的分钟
string result = string.Empty;
switch (TaskType)
{
//日计划任务
case TaskType.Day:
result = string.Format("0 {0} {1} 1/1 {3} ? {2}", TaskTimeMin, TaskTimeHour, TaskTimeYear, TaskTimeMonth);
break;
//周计划 （Condition 已逗号分隔 eg:1,2,5,7） 1：表示星期天 7：表示星期六
case TaskType.Week:
if (string.IsNullOrWhiteSpace(Condition)) Condition = "1-7";
result = string.Format("0 {0} {1} ? {4} {2} {3}", TaskTimeMin, TaskTimeHour, Condition, TaskTimeYear, TaskTimeMonth);
break;
//月计划（Condition表示月份 已逗号分隔 eg:1,2,5,7） 1：表示1月 12：表示12月
case TaskType.Month:
if (string.IsNullOrWhiteSpace(Condition)) Condition = "1-12"; //默认1到12月
if (string.IsNullOrWhiteSpace(Spacing)) Spacing = "1"; //默认1号发送
result = string.Format("0 {0} {1} {2} {3} ? {4}", TaskTimeMin, TaskTimeHour, Spacing, Condition, TaskTimeYear);
break;
default:
result = string.Empty;
break;
}
return result;
}
}
public enum TaskType
{
/// <summary>
/// 每日任务
/// </summary>
Day = 0,
/// <summary>
/// 每周任务
/// </summary>
Week = 1,
/// <summary>
/// 每月任务
/// </summary>
Month = 2,
/// <summary>
/// 一次性任务
/// </summary>
Once = 3
}
}