Wizard.AllowNavigationToStep(Int32) Metodo

Definizione

Utilizza un valore booleano per determinare se la proprietà ActiveStep può essere impostata sull'oggetto WizardStepBase che corrisponde all'indice passato.Uses a Boolean value to determine whether the ActiveStep property can be set to the WizardStepBase object that corresponds to the index that is passed in.

protected:
 virtual bool AllowNavigationToStep(int index);
protected virtual bool AllowNavigationToStep (int index);
abstract member AllowNavigationToStep : int -> bool
override this.AllowNavigationToStep : int -> bool
Protected Overridable Function AllowNavigationToStep (index As Integer) As Boolean

Parametri

index
Int32

Indice dell'oggetto WizardStepBase selezionato.The index of the WizardStepBase object being checked.

Restituisce

false se l'indice passato fa riferimento a un oggetto WizardStepBase a cui si è già avuto accesso e la relativa proprietà AllowReturn è impostata su false; in caso contrario, true.false if the index passed in refers to a WizardStepBase that has already been accessed and its AllowReturn property is set to false; otherwise, true.

Esempio

Nell'esempio di codice seguente viene illustrato come creare una classe derivata denominata CustomWizard ed eseguire l'override del metodo OnSideBarButtonClick.The following code example demonstrates how to create a derived class named CustomWizard and override the OnSideBarButtonClick method. Quando si fa clic su un pulsante nell'area dell'intestazione laterale del controllo CustomWizard, viene chiamato il metodo AllowNavigationToStep per determinare se è possibile accedere al passaggio selezionato.When a button on the sidebar area of the CustomWizard control is clicked, the AllowNavigationToStep method is called to determine whether the selected step can be accessed. Viene quindi scritto un messaggio nella pagina Web che lo contiene per informare l'utente di cosa si è verificato.A message is then written to the containing Web page informing the user of what has occurred.

<%@ page language="C#"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

  // This custom wizard control defines the OnSideBarButtonClick method
  // that uses the AllowNavigationToStep method to determine whether the
  // value passed in can be used to set the ActiveStepIndex property.    
  class CustomWizard : Wizard
  {    
    override protected void OnSideBarButtonClick(WizardNavigationEventArgs e)
    {
      base.OnSideBarButtonClick(e);
      if (AllowNavigationToStep(e.NextStepIndex))
      {
        this.Page.Response.Write("AllowNavigationToStep() returned true, moving to Step" 
          + (e.NextStepIndex + 1).ToString() + ".");
        this.ActiveStepIndex = e.NextStepIndex;
      }
      else
      {
        this.Page.Response.Write("AllowNavigationToStep() returned false for Step" 
          + (e.NextStepIndex + 1).ToString() + ", moving to Step2.");
        this.ActiveStepIndex = 1;
      }
    }         
  }
  
  // Add the custom wizard control to the page.
  void Page_Load(object sender, EventArgs e) 
  {
      CustomWizard WizardControl = new CustomWizard();
      WizardControl.ID = "WizardControl";
      
      // Create some steps for the custom wizard.
      for (int i = 0; i <= 5; i++)
      {
        WizardStep newStep = new WizardStep();
        newStep.ID = "Step" + (i + 1).ToString();
        // Set AllowReturn to false for some of the steps.        
        if ((i % 2) == 0)
        {
          newStep.AllowReturn = false;
        }
        
        // Add each step to the custom wizard.
        WizardControl.WizardSteps.Add(newStep);
      }
            
      // Display the wizard on the page.
      PlaceHolder1.Controls.Add(WizardControl);
  }
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>AllowNavigationToStep Example</title>
</head>
<body>
    <form id="Form1" runat="server">
      <h3>AllowNavigationToStep Example</h3>
      <asp:PlaceHolder id="PlaceHolder1" 
        runat="server" />
    </form>
  </body>
</html>
<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

  ' This custom wizard control defines the OnSideBarButtonClick method
  ' that uses the AllowNavigationToStep method to determine whether the
  ' value passed in can be used to set the ActiveStepIndex property.    
  Class CustomWizard
    Inherits Wizard
  
    Protected Overloads Sub OnSideBarButtonClick(ByVal sender As Object, _
      ByVal e As WizardNavigationEventArgs) Handles Me.SideBarButtonClick

      If AllowNavigationToStep(e.NextStepIndex) Then
        
        Me.Page.Response.Write("AllowNavigationToStep() returned true, moving to Step" & _
           (e.NextStepIndex + 1).ToString() & ".")
        Me.ActiveStepIndex = e.NextStepIndex
        
      Else
        
        Me.Page.Response.Write("AllowNavigationToStep() returned false for Step" & _
           (e.NextStepIndex + 1).ToString() & ", moving to Step2.")
        Me.ActiveStepIndex = 1
        
      End If
    End Sub
  End Class
  
  ' Add the custom wizard control to the page.
  Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)

    Dim WizardControl As New CustomWizard()
    WizardControl.ID = "WizardControl"
      
    ' Create some steps for the custom wizard.
    For i As Integer = 0 To 5
      Dim newStep As New WizardStep()
      newStep.ID = "Step" & (i + 1).ToString()
      ' Set AllowReturn to false for some of the steps.        
      If ((i Mod 2) = 0) Then
        newStep.AllowReturn = False
      End If
        
      ' Add each step to the custom wizard.
      WizardControl.WizardSteps.Add(newStep)
    Next
      
    ' Display the wizard on the page.
    PlaceHolder1.Controls.Add(WizardControl)
    
  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>AllowNavigationToStep Example</title>
</head>
<body>
    <form id="Form1" runat="server">
      <h3>AllowNavigationToStep Example</h3>
      <asp:PlaceHolder id="PlaceHolder1" 
        runat="server" />
    </form>
  </body>
</html>

Commenti

È possibile accedere al metodo AllowNavigationToStep da una classe derivata solo a causa del relativo modificatore di protected.The AllowNavigationToStep method can be accessed from a derived class only because of its protected modifier. In una classe derivata, è possibile utilizzare il metodo AllowNavigationToStep per determinare se l'indice passato può essere utilizzato per impostare la proprietà ActiveStepIndex.In a derived class, you can use the AllowNavigationToStep method to determine whether the index that is passed in can be used to set the ActiveStepIndex property. Il metodo AllowNavigationToStep restituirà false se l'indice passato fa riferimento a un oggetto WizardStepBase a cui è già stato eseguito l'accesso e la cui proprietà AllowReturn è impostata su false; in caso contrario, verrà restituito true.The AllowNavigationToStep method will return false if the index that is passed in refers to a WizardStepBase object that has already been accessed and has its AllowReturn property set to false; otherwise, it will return true.

Si applica a

Vedi anche