如何使用asp.net添加當前日期的天數

我想將日期添加到當前日期例如我想輸入數字的日期並且比我選擇我想要在當前日期中添加的日期指天，周，月，但是當我選擇天或數週或數月就說明天，但不能在其中添加在當前日期任何一個可以幫助我PLZ如何使用asp.net添加當前日期的天數

protected void TextBoxPredictDays_TextChanged(object sender, EventArgs e) 
     { 
      string selectPredictDays = DropDownList1.SelectedItem.Value; 
      String Days1; 
      int Result; 
      Days1 = TextBoxPredictedClosing.ToString(); 
      if (selectPredictDays == "Days") 
      { 

       Result = Convert.ToInt32(TextBoxPredictDays.Text) * 1; 
       TextBoxPredictedClosing.Text = Result.ToString(); 

      } 
      else if (selectPredictDays == "Weeks") 
      { 

       Result = Convert.ToInt32(TextBoxPredictDays.Text) * 7; 
       TextBoxPredictedClosing.Text = Result.ToString(); 
      } 
      else if (selectPredictDays == "Months") 
      { 

       Result = Convert.ToInt32(TextBoxPredictDays.Text) * 30; 
       TextBoxPredictedClosing.Text = Result.ToString(); 
      } 

     }

這是我設計的代碼

<asp:TextBox ID="TextBoxPredictDays" runat="server" 
      ontextchanged="TextBoxPredictDays_TextChanged" Width="101px" Height="14px" ></asp:TextBox> 
     <asp:DropDownList ID="DropDownList1" runat="server" 
      onselectedindexchanged="DropDownList1_SelectedIndexChanged"> 
      <asp:ListItem>Days</asp:ListItem> 
      <asp:ListItem>Weeks</asp:ListItem> 
      <asp:ListItem>Months</asp:ListItem> 
     </asp:DropDownList>

來源

2015-12-14 Ismail

你要求今天的日期時間= DateTime.Now; DateTime answer = today.AddDays（36）;請參閱https://msdn.microsoft.com/zh-CN/library/system.datetime.adddays(v=vs.110).aspx – Anil

DateTime.Now.AddDays(int) - 天
DateTime.Now.AddDays(int * 7) - 幾個星期
DateTime.Now.AddMonths(int) - 幾個月

來源

2015-12-14 11:14:48

DateTime dt = DateTime.Now.AddDays(int); Days 
dt = DateTime.Now.AddMonths(int); Months 
dt = DateTime.Now.AddDays(int * 7); Week

來源

2015-12-14 11:20:00 Dilip

這是你的方法是什麼樣子：

protected void TextBoxPredictDays_TextChanged(object sender, EventArgs e) 
     { 
      string selectPredictDays = DropDownList1.SelectedItem.Value; 
      if (selectPredictDays == "Days") 
      { 
       TextBoxPredictedClosing.Text = DateTime.Now.AddDays(Convert.ToInt32(TextBoxPredictDays.Text)); 
      } 
      else if (selectPredictDays == "Weeks") 
      { 
       TextBoxPredictedClosing.Text = DateTime.Now.AddDays(Convert.ToInt32(TextBoxPredictDays.Text) * 7); 
      } 
      else if (selectPredictDays == "Months") 
      { 
       TextBoxPredictedClosing.Text = DateTime.Now.AddMonths(Convert.ToInt32(TextBoxPredictDays.Text)); 
      } 
     }

來源

2015-12-14 11:21:20 sachin

如何使用asp.net添加當前日期的天數

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