验证控件

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验证控件主要有以下6种:
1<asp:RequiredFieldValidator>
2<asp:RangeValidator>
3<asp:CompareValidator>
4 <asp:RegularExpressionValidator>
5 <asp:CustomValidator>//此控件最灵活
6<asp:ValidationSummary>
注:验证可以在服务端,客户端以及两者都可以进行验证,关键是使用时机.
具体用法见例:
//用于客户端验证一个数是否是素数
<script language="JavaScript">

</script>

<form runat="server">
<table border="0">
<--asp:RequiredFieldValidator控件,用于验证必添项目-->
<tr>
<td align="right">A Required Value:</td>
<td><input type="text" id="txtRequired" size="20" runat="server" />
      <asp:RequiredFieldValidator id="valRequired" runat="server"
           ControlToValidate="txtRequired"
           ErrorMessage="* You must enter a value in the first text box"
           Display="dynamic">
           *
      </asp:RequiredFieldValidator>
</td>
</tr><tr>
<--asp:CompareValidator控件,用于比较,可以是与其它控件比较,也可以是与某个值比较-->
<td align="right">The Same Value Again:</td>
<td><input type="text" id="txtCompare" size="20" runat="server" />
      <asp:CompareValidator id="valCompare" runat="server"
           ControlToValidate="txtCompare"
           ControlToCompare="txtRequired"
           Operator="Equal"
           ErrorMessage="* You must enter the same value in the second text box"
           Display="dynamic">
           *
      </asp:CompareValidator>
</td>
</tr><tr>
<td align="right">A Date after 3rd March 2001:</td>
<td><input type="text" id="txtCompareDate" size="10" runat="server" />
      <span class="cite">Tip: use something like "10/10/02"</span>
      <asp:CompareValidator id="valCompareDate" runat="server"
           ControlToValidate="txtCompareDate"
           ValueToCompare="10/10/01"
           Operator="GreaterThan"
           Type="Date"
           ErrorMessage="* The Date must be later than 3rd March 2001"
           Display="dynamic">
           *
      </asp:CompareValidator>
</td>
</tr><tr>
<--asp:RangeValidator,验证是否在范围内-->
<td align="right">A Number between 1 and 10:</td>
<td><input type="text" id="txtRange" size="5" runat="server" />
      <asp:RangeValidator id="valRange" runat="server"
           ControlToValidate="txtRange"
           MaximumValue="10"
           MinimumValue="1"
           Type="Integer"    //比较类型
           ErrorMessage="* The Number must between 1 and 10"
           Display="dynamic">
           *
      </asp:RangeValidator>
</td>
</tr><tr>
<--asp:RegularExpressionValidator验证是否符合正规表达式-->
<td align="right">Match Expression "<b>.*@.*/..*</b>":</td>
<td><input type="text" id="txtRegExpr" size="40" runat="server" />
      <span class="cite">Tip: enter a valid email address</span>
      <asp:RegularExpressionValidator id="valRegExpr" runat="server"
           ControlToValidate="txtRegExpr"
           ValidationExpression=".*@.*/..*"
           ErrorMessage="* Your entry does not match the regular expression"
           Display="dynamic">
           *
      </asp:RegularExpressionValidator>
</td>
</tr><tr>
<--asp:CustomValidator自定义控件-->
<td align="right">A Prime Number over 100:</td>
<td><input type="text" id="txtCustom" size="5" runat="server" />
      <span class="cite">Tip: 197 will work</span>
      <asp:CompareValidator id="valComparePrime" runat="server"
           ControlToValidate="txtCustom"
           ValueToCompare="100"
           Operator="GreaterThan"
           Type="Integer"
           ErrorMessage="* The Prime Number must be greater than 100"
           Display="dynamic">
           *
      </asp:CompareValidator>
      <asp:CustomValidator id="valCustom" runat="server"
           ControlToValidate="txtCustom"
           ClientValidationFunction="ClientValidate"//客户端验证
           OnServerValidate="ServerValidate"//服务端验证
           ErrorMessage="* Your knowledge of prime numbers is less than optimal"
           Display="dynamic">
           *
      </asp:CustomValidator>
</td>
</tr>
</table>
<--asp:ValidationSummary 用于显示验证失败信息-->
<asp:ValidationSummary id="valSummary" runat="server"
     HeaderText="<b>The following errors were found:</b>"
     ShowSummary="true" DisplayMode="List" />

<hr />
Validation Enabled:
<asp:DropDownList AutoPostBack="True" id="lstEnabled" runat="server">
<asp:ListItem Text="True" /><asp:ListItem Text="False" /></asp:DropDownList>
   EnableClientScript:
<asp:DropDownList AutoPostBack="True" id="lstClientScript" runat="server">
<asp:ListItem Text="True" /><asp:ListItem Text="False" /></asp:DropDownList>
   ShowMessageBox:
<asp:DropDownList AutoPostBack="True" id="lstMessageBox" runat="server">
<asp:ListItem Text="False" /><asp:ListItem Text="True" /></asp:DropDownList>
<p />   
<input type="submit" id="cmdConfirm" value="Submit" runat="server" onserverclick="ConfirmEntry">   
<input type="submit" id="cmdCancel" value="Cancel" runat="server" causesvalidation="false" onserverclick="CancelEntry">   
</form>

void Page_Load(Object sender, EventArgs e)
{
  foreach (BaseValidator objValidator in Page.Validators)
  {
   objValidator.Enabled = Convert.ToBoolean(lstEnabled.SelectedItem.Text);
   objValidator.EnableClientScript = Convert.ToBoolean(lstClientScript.SelectedItem.Text);
  }
  valSummary.ShowMessageBox = Convert.ToBoolean(lstMessageBox.SelectedItem.Text);
}

void ServerValidate(Object sender, ServerValidateEventArgs e)
{
  Boolean blnValid = true;
  try
  {
   int intNumber = Convert.ToInt32(e.Value);

   // check that it's an odd number
   if ((intNumber % 2) == 1)
   {
    // get the largest possible divisor
    int intDivisor = (int)(intNumber / 3);
    if (intDivisor > 2)
    {
     // check using each divisor in turn
     for (int intLoop = 3; intLoop <= intDivisor; intLoop += 2)
     {
      if ((intNumber % intDivisor) == 0)
      {
       blnValid = false;
       break;
      }
     }
    }
    else
     blnValid = false;
   }
   else
    blnValid = false;
  }
  catch (Exception objError)
  {
   blnValid = false;
  }
  finally
  {
   e.IsValid = blnValid;
  }
}

void ConfirmEntry(Object sender, EventArgs e)
{
outMessage.InnerHtml = "Page.IsValid returned <b>" + Page.IsValid + ".</b>";
}

void CancelEntry(Object sender, EventArgs e)
{
outMessage.InnerHtml = "Validation was not carried out.";
}

</script>