PersistChildrenAttribute Constructeurs

Définition

Espace de noms:

System.Web.UI

Assembly:

System.Web.dll

Initialise une nouvelle instance de la classe PersistChildrenAttribute.

Surcharges

PersistChildrenAttribute(Boolean)	Initialise une nouvelle instance de la classe PersistChildrenAttribute à l'aide d'une valeur Boolean qui indique s'il faut ou non rendre le contenu imbriqué persistant sous forme de contrôles imbriqués.
PersistChildrenAttribute(Boolean, Boolean)	Initialise une nouvelle instance de la classe PersistChildrenAttribute en utilisant deux valeurs Boolean. L'une indique s'il faut ou non rendre le contenu imbriqué persistant sous forme de contrôles imbriqués, l'autre s'il faut ou non utiliser une méthode de persistance personnalisée.

PersistChildrenAttribute(Boolean)

Initialise une nouvelle instance de la classe PersistChildrenAttribute à l'aide d'une valeur Boolean qui indique s'il faut ou non rendre le contenu imbriqué persistant sous forme de contrôles imbriqués.

public:
 PersistChildrenAttribute(bool persist);

public PersistChildrenAttribute (bool persist);

new System.Web.UI.PersistChildrenAttribute : bool -> System.Web.UI.PersistChildrenAttribute

Public Sub New (persist As Boolean)

Paramètres

persist

Boolean

true pour rendre persistant le contenu imbriqué sous forme de contrôles imbriqués ; sinon, false.

Exemples

L’exemple de code suivant montre comment appliquer l’attribut PersistChildrenAttribute pour un contrôle serveur personnalisé nommé CollectionPropertyControl.

Cet exemple de code fait partie d’un exemple plus grand fourni pour la PersistChildrenAttribute classe .

// Use the PersistChildren attribute to set the Persist
// property to false so that none of this class's
// child controls will be persisted as controls. They will
// be persisted only as child elements of this class.
// If you set the PersistChildren attribute to true, or if you
// do not include this attribute when you create a control,
// the child controls will be persisted as controls.   
[PersistChildren(false)]
[AspNetHostingPermission(SecurityAction.Demand, 
   Level=AspNetHostingPermissionLevel.Minimal)]
public sealed class CollectionPropertyControl : Control
{  
   private String header;
   private ArrayList employees = new ArrayList();
   
   public String Header
   {
      get
      {
         return header;
      }
      set
      {
         header = value;
      }
   }

   public ArrayList Employees
   {
      get 
      {
         return employees;
      }
   }
   // Override the CreateChildControls method to 
   // add child controls to the Employees property when this
   // custom control is requested from a page.
   protected override void CreateChildControls()
   {
      Label label = new Label();
      label.Text = Header;
      label.BackColor = Color.Beige;
      label.ForeColor = Color.Red;
      Controls.Add(label);
      Controls.Add(new LiteralControl("<BR> <BR>"));

      Table table = new Table();
      TableRow htr = new TableRow();

      TableHeaderCell hcell1 = new TableHeaderCell();    
      hcell1.Text = "Name";
      htr.Cells.Add(hcell1);

      TableHeaderCell hcell2 = new TableHeaderCell();
      hcell2.Text = "Title";
      htr.Cells.Add(hcell2);
      
      TableHeaderCell hcell3 = new TableHeaderCell();
      hcell3.Text = "Alias";
      htr.Cells.Add(hcell3);
      table.Rows.Add(htr);

      table.BorderWidth = 2;
      table.BackColor = Color.Beige;
      table.ForeColor = Color.Red;
      foreach (Employee employee in Employees)
      {
         TableRow tr = new TableRow();

         TableCell cell1 = new TableCell();
         cell1.Text = employee.Name;
         tr.Cells.Add(cell1);
         
         TableCell cell2 = new TableCell();
         cell2.Text = employee.Title;
         tr.Cells.Add(cell2);
         
         TableCell cell3 = new TableCell();
         cell3.Text = employee.Alias;
         tr.Cells.Add(cell3);
         
         table.Rows.Add(tr);
      }
      Controls.Add(table);
   }
}

' Use the PersistChildren attribute to set the Persist
' property to false so that none of this class's
' child controls will be persisted as controls. They will
' be persisted only as child elements of this class.
' If you set the PersistChildren attribute to true, or if you
' do not include this attribute when you create a control,
' the child controls will be persisted as controls.
<PersistChildren(False)>  _
<AspNetHostingPermission(SecurityAction.Demand, _
  Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CollectionPropertyControl
  Inherits Control
  Private _header As String
  Private _employees As New ArrayList()
  
  
  Public Property Header() As String
     Get
        Return _header
     End Get
     Set
        _header = value
     End Set
  End Property
  
  
  
  
  Public ReadOnly Property Employees() As ArrayList
     Get
        Return _employees
     End Get
  End Property
  
  ' Override the CreateChildControls method to 
  ' add child controls to the Employees property when this
  ' custom control is requested from a page.
  Protected Overrides Sub CreateChildControls()
     Dim label As New Label()
     label.Text = Header
     label.BackColor = Color.Beige
     label.ForeColor = Color.Red
     Controls.Add(label)
     Controls.Add(New LiteralControl("<BR> <BR>"))
     
     Dim table As New Table()
     Dim htr As New TableRow()
     
     Dim hcell1 As New TableHeaderCell()
     hcell1.Text = "Name"
     htr.Cells.Add(hcell1)
     
     Dim hcell2 As New TableHeaderCell()
     hcell2.Text = "Title"
     htr.Cells.Add(hcell2)
     
     Dim hcell3 As New TableHeaderCell()
     hcell3.Text = "Alias"
     htr.Cells.Add(hcell3)
     table.Rows.Add(htr)
     
     table.BorderWidth = Unit.Pixel(2)
     table.BackColor = Color.Beige
     table.ForeColor = Color.Red
     Dim employee As Employee
     For Each employee In  Employees
        Dim tr As New TableRow()
        
        Dim cell1 As New TableCell()
        cell1.Text = employee.Name
        tr.Cells.Add(cell1)
        
        Dim cell2 As New TableCell()
        cell2.Text = employee.Title
        tr.Cells.Add(cell2)
        
        Dim cell3 As New TableCell()
        cell3.Text = employee.Alias
        tr.Cells.Add(cell3)
        
        table.Rows.Add(tr)
     Next employee
     Controls.Add(table)
  End Sub
End Class

Voir aussi

• Control
• Développement de contrôles personnalisés

PersistChildrenAttribute(Boolean, Boolean)

Initialise une nouvelle instance de la classe PersistChildrenAttribute en utilisant deux valeurs Boolean. L'une indique s'il faut ou non rendre le contenu imbriqué persistant sous forme de contrôles imbriqués, l'autre s'il faut ou non utiliser une méthode de persistance personnalisée.

public:
 PersistChildrenAttribute(bool persist, bool usesCustomPersistence);

public PersistChildrenAttribute (bool persist, bool usesCustomPersistence);

new System.Web.UI.PersistChildrenAttribute : bool * bool -> System.Web.UI.PersistChildrenAttribute

Public Sub New (persist As Boolean, usesCustomPersistence As Boolean)

Paramètres

persist

Boolean

true pour rendre persistant le contenu imbriqué sous forme de contrôles imbriqués ; sinon, false.

usesCustomPersistence

Boolean

true pour utiliser la persistance personnalisée ; sinon, false.