/// <summary>
/// 获取 Cron 表达式下一个发生时间
/// </summary>
/// <param name="expression"></param>
/// <param name="cronFormat"></param>
/// <returns></returns>
public static DateTimeOffset?GetCronNextOccurrence(string expression, CronFormat?cronFormat = default)
{
// 支持从配置模板读取
var realExpression = expression.Render();
// 自动化 CronFormat
if (cronFormat == null)
{
var parts = realExpression.Split(' ', StringSplitOptions.RemoveEmptyEntries);
cronFormat = parts.Length <= 5 ? CronFormat.Standard : CronFormat.IncludeSeconds;
}
// 解析 Cron 表达式
if (!CronExpressionSet.TryGetValue(realExpression, out var cronExpression))
{
cronExpression = CronExpression.Parse(realExpression, cronFormat.Value);
CronExpressionSet.TryAdd(realExpression, cronExpression);
}
// 获取下一个执行时间
var nextTime = cronExpression.GetNextOccurrence(DateTimeOffset.UtcNow, TimeZoneInfo.Local);
return(nextTime);
}
