c# - 自定义验证错误

Question

我的用户控件是这样的:

    <asp:TextBox ID="_txtLeadDate" runat="server" ReadOnly="true">
    </asp:TextBox>
    <asp:CustomValidator ID="CustomValidator2" runat="server" ControlToValidate="_txtLeadDate" ErrorMessage="You cannot select a day earlier than today!" OnServerValidate="CustomValidator2_ServerValidate" SetFocusOnError="True">&nbsp;
    </asp:CustomValidator>

服务器端代码是:

protected void CustomValidator2_ServerValidate(object source, ServerValidateEventArgs args){
   if (some condition){
            args.IsValid = false;
   }else{
            args.IsValid = true;
   }
 }

但是页面显示错误:

'ASP.usercontrol_preordercontrol_ascx' does not contain a definition for 'CustomValidator2_ServerValidate' and no extension method 'CustomValidator2_ServerValidate' accepting a first argument of type 'ASP.usercontrol_preordercontrol_ascx' could be found (are you missing a using directive or an assembly reference?)

Answer 1

确保以下事件

protected void CustomValidator2_ServerValidate(object source, ServerValidateEventArgs args)

在您的 UserControl(.ascx) 后面的代码中声明，而不是您调用此 UserControl 的 .aspx 表单。