在使用CompareValidator对于日期进行验证的时候，最好多一个对于日期格式的验证

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在使用CompareValidator对于日期进行验证的时候，最好多一个对于日期格式的验证。因为不能保证所有的控件里的输入都是系统可接受的日期格式：

另外，对于calendar控件，是不能直接使用CompareValidator的，最好把Calendar控件的值传到一个hidden的TextBox里去：

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;namespace UserRegisterSample{ public partial class RegisterUser : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { CompareValidator2.ValueToCompare = System.DateTime.Now.ToShortDateString(); } protected void MyCalendar_SelectionChanged(object sender, EventArgs e) { Textbox1.Text = MyCalendar.SelectedDate.ToShortDateString(); } }} <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="RegisterUser.aspx.cs" Inherits="UserRegisterSample.RegisterUser" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server"> <title></title></head><body> <form id="form1" runat="server"> <div> <asp:DropDownList ID="testDDL" runat="server"> <asp:ListItem Selected=True>Please select your job.</asp:ListItem> <asp:ListItem>Student</asp:ListItem> <asp:ListItem>Teacher</asp:ListItem> <asp:ListItem>Business man</asp:ListItem> <asp:ListItem>Policeman</asp:ListItem> </asp:DropDownList> <asp:Label ID="LabelDateReminder" runat="server" Text="A date input is required, but be later than Today."></asp:Label> <br /> <label id="Lable1">TextBox1</label> <asp:TextBox ID="Textbox1" runat="server"></asp:TextBox><br /> <asp:TextBox ID="Textbox2" runat="server" Visible="true" >1</asp:TextBox> <asp:Calendar ID="MyCalendar" runat="server" Height= "247px" Width="290px" ForeColor="Black" Font-Names="Calibir" BorderWidth="1px" Font-Size="9pt" BackColor="Plum" BorderColor="White" NextPrevFormat="FullMonth" SelectionMode="DayWeek" OnSelectionChanged="MyCalendar_SelectionChanged"></asp:Calendar> <asp:CompareValidator ID="CompareValidator1" runat="server" ControlToValidate="Textbox1" ErrorMessage="TextBox1中的输入必须是日期。" Operator="DataTypeCheck" Type="Date" SetFocusOnError="true" >*</asp:CompareValidator> <br /> <asp:CompareValidator ID="CompareValidator2" runat="server" ControlToValidate="Textbox1" ErrorMessage="TextBox1中的输入必须早于今天。" Operator="LessThan" Type="Date" SetFocusOnError="true" >*</asp:CompareValidator> <br /> <asp:RequiredFieldValidator ID="valRequired" runat="server" ErrorMessage="This filed cannot be left empty." ControlToValidate="testDDL" Display="Dynamic" InitialValue="Please select your job.">*</asp:RequiredFieldValidator> <asp:RangeValidator ID="RangeValidator" runat="server" ErrorMessage="This number is not in the range" ControlToValidate="Textbox2" MaximumValue="10" MinimumValue="1" Type="Integer"></asp:RangeValidator> <asp:Button ID="btnSubmit" runat="server" Text="Submit" onclick="btnSubmit_Click"/> <asp:ValidationSummary ID="valSummary" runat="server" HeaderText="<b>Error message is:</b>" ShowSummary="true" DisplayMode="List" /> </div> </form></body></html> 这里实际CompareValidator比较的还是Calendar控件里的值，只不过是通过Textbox1做了一个中转。每一次Calendar控件上有SelectionChanged这个事件的时候，都会把Calendar控件里的日期值传给Textbox1.