日期比較

Question

如何檢查日期是大於或等於

DateTime StartDate = Convert.ToDateTime(TxtStrtDate.Text); 
DateTime ExpirationDate = Convert.ToDateTime(TxtExpDte.Text); 

Answer 1

DateTime.Compare()是我能想到的最簡單的方法。

Answer 2

如何

bool b = ExpirationDate >= StartDate; 

閱讀本DateTime.GreaterThanOrEqual Operator

OR

int i = DateTime.Compare(ExpirationDate, StartDate); 

//if ExpirationDate is less than StartDate then result is Less than zero 

//if ExpirationDate equals StartDate then result is Zero 

//if ExpirationDate is greater than StartDate then result is Greater than zero