驗證當前月份中的日期

Question

我正在處理髮票的日期字段。爲發票日期選擇的日期不能是當前月份以外的任何日期。

這裏是我的代碼：

at Page_Load: 
Dim firstOfTheMonthDate As DateTime = FirstDayOfMonthFromDateTime(DateTime.Now) 
       Me.compareValidatorDate.ValueToCompare = firstOfTheMonthDate.ToString("d") 

我的專用功能

Private Function FirstDayOfMonthFromDateTime(dateTime As DateTime) As DateTime 
     Return New DateTime(dateTime.Year, dateTime.Month, 1) 
    End Function 

客戶端：

<asp:Label ID="lblInvDate" runat="server" AssociatedControlID="txtInvDate">Invoice Date:</asp:Label> 
        <asp:TextBox runat="server" ID="txtInvDate" MaxLength="20" CssClass="L5 DateCal" /> 
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" ControlToValidate="txtInvDate" 
        Text="The date field is required!" runat="server" /> 
        <asp:CompareValidator ID="compareValidatorDate" ControlToValidate="txtInvDate" 
        Type="Date" Operator="LessThan" ErrorMessage="Date must be from this month!" 
        Display="Dynamic" runat="server" /> 

我遇到的問題是，確認不會發生，或至少，如果輸入的日期不是空白或空白，則保存發票日期。我如何改進我的代碼？

信用卡爾安德森幫助代碼。

Answer 1

我很抱歉沒有注意到這一點，但我早些給了你不正確的邏輯。

較好的解決辦法是使用RangeValidator，像這樣：

代碼隱藏（Page_Load）：

Dim firstOfTheMonthDate As DateTime = FirstDayOfMonthFromDateTime(DateTime.Now) 
Dim endOfTheMonthDate As DateTime = LastDayOfMonthFromDateTime(DateTime.Now) 
Me.rangeValidatorDate.MinimumValue = firstOfTheMonthDate.ToString("d") 
Me.rangeValidatorDate.MaximumValue = endOfTheMonthDate.ToString("d") 

代碼隱藏（效用函數）：

Private Function FirstDayOfMonthFromDateTime(dateTime As DateTime) As DateTime 
    Return New DateTime(dateTime.Year, dateTime.Month, 1) 
End Function 

Public Function LastDayOfMonthFromDateTime(dateTime As DateTime) As DateTime 
    Dim firstDayOfTheMonth As New DateTime(dateTime.Year, dateTime.Month, 1) 
    Return firstDayOfTheMonth.AddMonths(1).AddDays(-1) 
End Function 

客戶端：

<asp:Label ID="lblInvDate" runat="server" AssociatedControlID="txtInvDate">Invoice Date:</asp:Label> 
<asp:TextBox runat="server" ID="txtInvDate" MaxLength="20" CssClass="L5 DateCal" /> 
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" ControlToValidate="txtInvDate" 
    Text="The date field is required!" runat="server" /> 
<asp:RangeValidator id="rangeValidatorDate" runat="server" 
    ControlToValidate="txtInvDate" Type="Date" Display="Dynamic" />