如何檢查用戶是21和25使用日期選擇器C＃

Question

我使用WPF其中用戶如果用戶隨後選擇其上的datePicker然後檢查用戶是否是21和25之間DOB提出申請之間如果不顯示任何內容，則顯示MessageBox說「成功」。我如何計算出這個結果

Answer 1

// Just an example obj for the code. 
datePicker dp = new DatePicker(); 

dateMinimum = DateTime.Now.AddYears(-21); 
dateMaximum = DateTime.Now.AddYears(-26); // 26, as this would include somebody whose just below 26 years old 
birthDate = dp.SelectedDate; 

if (birthDate > dateMinimum && birthDate < dateMaximum) { 
    MessageBox.Show("Success"); 
}