如何獲得從asp.net中的2個日曆中選擇的總天數

Question

就像在我的問題中，我有兩個日曆要由用戶選擇，我想要總選定日期和將顯示在標籤。

用戶必須選擇lstdate日曆中的開始日期和lenddate日曆中的結束日期。

private void ValidateDate() 
{ 
    if (lstartdate.Text == "" || lenddate.Text == "") 
    { 
     lwarndate.Visible = true; 
     lwarndate.Text = "Dates required"; 
    } 

    if (lstartdate.Text != "" || lenddate.Text != "") 
    { 
     if (cstart.SelectedDate > cend.SelectedDate) 
     { 
      lwarndate.Visible = true; 
      lwarndate.Text = "Start date must be earlier than end date!"; 
     } 
     if (cstart.SelectedDate <= cend.SelectedDate) 
     { 
      lwarndate.Visible = false; 
     } 
     if (cend.SelectedDate != null && cstart.SelectedDate != null) 
     { 
      Double Value; 
      if (cend.SelectedDate >= cstart.SelectedDate) 
       Value = (cend.SelectedDate - cstart.SelectedDate).TotalDays; 
      else 
       Value = (cend.SelectedDate - cstart.SelectedDate).TotalDays; 
      total.Text = // ? 
     } 
    } 
} 

我不確定代碼安排是否正確。做幫助和TQ :)

Answer 1

TRY喜歡這個

 DateTime DtF = ceFromDate.SelectedDate.Value; 
     DateTime D1T = ceToDate.SelectedDate.Value; 

     double dd = (DtF - D1T).TotalDays; 

     total.Text = dd.ToString(); 

Answer 2

下面是簡單的方法，兩個日期

class Program 
    { 
     static void Main(string[] args) 
     { 
      System.DateTime dtTodayNoon = new System.DateTime(2006, 9, 13, 12, 0, 0); 
      System.DateTime dtTodayMidnight = new System.DateTime(2006, 9, 13, 0, 0, 0); 
      System.TimeSpan diffResult = dtTodayNoon.Subtract(dtYestMidnight); 
      Console.WriteLine("Yesterday Midnight - Today Noon = " + diffResult.Days); 
      Console.WriteLine("Yesterday Midnight - Today Noon = " + diffResult.TotalDays); 
      Console.ReadLine(); 
     } 
    } 

Source

你需要實現它自己之間得到不同..

Answer 3

轉換兩者之間的區別約會到TimeSpan中，然後獲取該TimeSpan的天數並將其設置爲您的文本值。

private void ValidateDate() 
{ 
    if (lstartdate.Text == "" || lenddate.Text == "") 
    { 
     lwarndate.Visible = true; 
     lwarndate.Text = "Dates required"; 
    } 

    if (lstartdate.Text != "" || lenddate.Text != "") 
    { 
     if (cstart.SelectedDate > cend.SelectedDate) 
     { 
      lwarndate.Visible = true; 
      lwarndate.Text = "Start date must be earlier than end date!"; 
     }else{ 
      lwarndate.Visible = false; 
     } 
     if (cend.SelectedDate != null && cstart.SelectedDate != null) 
     { 
      TimeSpan duration = DateTime.Parse(cend.SelectedDate).Subtract(DateTime.Parse(cstart.SelectedDate)); 
      total.Text = duration.Days.ToString(); 
     } 
    } 
}