Question

在我的网络表单上，我有一个TextBox，我想在其上执行自定义验证：

<asp:TextBox ID="tbDate" runat="server"></asp:TextBox>
<asp:Button ID="btnSubmit" runat="server" Text="Submit" />
<asp:CustomValidator runat="server" ID="valDate" ControlToValidate="tbDate" onServerValidate="valDate_ServerValidate" ValidateEmptyText="true" ></asp:CustomValidator>

在我后面的代码中，我在Page_Load中设置了TextBox的文本日期，并且我有一个验证函数：

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    tbDate.Text = DateTime.Today.ToShortDateString
End Sub

Protected Sub valDate_ServerValidate(source As Object, args As ServerValidateEventArgs)        
    Dim newDate As DateTime
    args.IsValid = DateTime.TryParse(args.Value, newDate)
End Sub

问题在于：如果我在文本框中输入一个值并单击“提交”按钮（或按Enter键），则验证功能不会收到我键入的值。相反，在valDate_ServerValidate内，args.Value设置为在Page_Load中设置的文本框的初始值。这是怎么回事？

Answer 1

您总是覆盖该值，因此请更改

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    tbDate.Text = DateTime.Today.ToShortDateString
End Sub

到

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If Not IsPostBack Then tbDate.Text = DateTime.Today.ToShortDateString
End Sub

为什么将错误的值传递给我的服务器验证函数？

1 个答案: