Evento ServerValidate

Si verifica quando la convalida personalizzata consente di convalidare il valore della proprietà ControlToValidate.

public event System.Web.UI.WebControls.ServerValidateEventHandler ServerValidate

Osservazioni

Se viene registrato un metodo con questo evento, esso viene chiamato con il valore della proprietà ControlToValidate. La convalida ha esito positivo solo se il gestore eventi restituisce true.

Esempio

Nell'esempio riportato di seguito viene mostrato come intercettare l'evento ServerValidate per aggiungere la logica per la convalida della pagina.

[Visual Basic]

Protected Sub Submit_OnClick(sender As Object, e As EventArgs)
   ' Validator checking. If things go wrong, return.
   ' The validator's error message will be displayed on
   ' the same panel.
   If Page.IsValid Then
      ActiveForm = Form2
   End If
End Sub

Public Sub ServerValidate(source As Object, args As ServerValidateEventArgs)
   Dim num As Integer = Int32.Parse(args.Value)
   
   If num Mod 2 = 0 Then
      cust.Text = "Valid number"
      args.IsValid = True
   Else
      cust.Text = "InValid number"
      args.IsValid = False
   End If
End Sub


Private Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load

   cust.Alignment = System.Web.UI.MobileControls.Alignment.Center
   cust.Wrapping = System.Web.UI.MobileControls.Wrapping.NoWrap
   cust.ForeColor = System.Drawing.Color.Blue
   cust.StyleReference = "Title"
   cust.Display = System.Web.UI.WebControls.ValidatorDisplay.Static

End Sub

<mobile:Form id="Form1" runat=server>
  <mobile:Label id="message1" runat=server>
    Please enter an Even number
  </mobile:Label>
  <mobile:TextBox id="number" runat=server MaxLength=9 />
  <mobile:CustomValidator ID="cust" ControlToValidate="number"
            OnServerValidate="ServerValidate"
            runat=server >
    Invalid number
  </mobile:CustomValidator>
  <mobile:Command id="Command1" runat=server OnClick="Submit_OnClick">
    Submit
  </mobile:Command>
</mobile:Form>
<mobile:Form id="Form2" runat=server>
  <mobile:Label id="Label2" runat=server>number is submitted</mobile:Label>
</mobile:Form>

<script language="c#" runat=server>
protected void Submit_OnClick(Object sender, EventArgs e)
{
  // Validator checking. If things go wrong, return.
  // The validator's error message will be displayed on
  // the same panel.
  if (Page.IsValid)
  {
    ActiveForm = Form2;
  }
}
public void ServerValidate (object source, ServerValidateEventArgs args)
{
  int num = Int32.Parse(args.Value);

  if (num % 2 == 0)
   {
       cust.Text    = "Valid number";
       args.IsValid = true;   
   }
  else
   {
       cust.Text    = "InValid number";
       args.IsValid = false;
   }
}
public void Page_Load(Object sender, EventArgs e)
{
   cust.Alignment      = System.Web.UI.MobileControls.Alignment.Center;
   cust.Wrapping       = System.Web.UI.MobileControls.Wrapping.NoWrap;
   cust.ForeColor      = System.Drawing.Color.Blue; 
   cust.StyleReference = "Title";
   cust.Display        = System.Web.UI.WebControls.ValidatorDisplay.Static;
}
</script>
<mobile:Form id="Form1" runat=server>
  <mobile:Label id="message1" runat=server>
    Please enter an Even number
  </mobile:Label>
  <mobile:TextBox id="number" runat=server MaxLength=9 />
  <mobile:CustomValidator ID="cust" ControlToValidate="number"
            OnServerValidate="ServerValidate"
            runat=server >
    Invalid number
  </mobile:CustomValidator>
  <mobile:Command id="Command1" runat=server OnClick="Submit_OnClick">
    Submit
  </mobile:Command>
</mobile:Form>
<mobile:Form id="Form2" runat=server>
  <mobile:Label id="Label2" runat=server>number is submitted</mobile:Label>
</mobile:Form>

Vedere anche

Classe CustomValidator