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var now = DateTime.Now;
var firstDay = new DateTime(now.Year, now.Month, 1);
var result = string.Empty;
var w = firstDay.DayOfWeek;
var n = ((now - firstDay).Days / 7);
if (w <= DayOfWeek.Thursday)
{
result =$"今天是本月第{n+1}周";
}
else
{
result = $"今天是本月第{n}周";
}
Console.WriteLine(result);