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IPersonalizable.Load(PersonalizationDictionary) Método

Definición

Carga los datos personalizados en un control.

public:
 void Load(System::Web::UI::WebControls::WebParts::PersonalizationDictionary ^ state);
public void Load (System.Web.UI.WebControls.WebParts.PersonalizationDictionary state);
abstract member Load : System.Web.UI.WebControls.WebParts.PersonalizationDictionary -> unit
Public Sub Load (state As PersonalizationDictionary)

Parámetros

state
PersonalizationDictionary

PersonalizationDictionary que contiene datos con ámbito personalizados cargados desde el almacén de datos subyacente.

Ejemplos

En el ejemplo de código siguiente se muestra una implementación del Load método en un control personalizado WebPart . Para obtener el código completo necesario para ejecutar este ejemplo, consulte la sección Ejemplo de la información general de la IPersonalizable clase.

namespace Samples.AspNet.CS.Controls
{

    using System;
    using System.Collections;
    using System.ComponentModel;
    using System.Diagnostics;
    using System.Drawing;
    using System.Web;
    using System.Web.UI;
    using System.Security.Permissions;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;

    [AspNetHostingPermission(SecurityAction.Demand,
      Level = AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand,
      Level = AspNetHostingPermissionLevel.Minimal)]
    public class UrlListWebPart : WebPart, IPersonalizable
    {
        private ArrayList _sharedUrls;
        private ArrayList _userUrls;
        private bool _listDirty;

        private TextBox _nameTextBox;
        private TextBox _urlTextBox;
        private Button _addButton;
        private BulletedList _list;

        protected override void CreateChildControls()
        {
            Label nameLabel = new Label();
            Label urlLabel = new Label();
            LiteralControl breakLiteral1 = new LiteralControl("<br />");
            LiteralControl breakLiteral2 = new LiteralControl("<br />");
            LiteralControl breakLiteral3 = new LiteralControl("<br />");

            _nameTextBox = new TextBox();
            _urlTextBox = new TextBox();
            _addButton = new Button();
            _list = new BulletedList();

            nameLabel.Text = "Name: ";
            urlLabel.Text = "URL: ";
            _nameTextBox.ID = "nameTextBox";
            _urlTextBox.ID = "urlTextBox";
            _addButton.Text = "Add";
            _addButton.ID = "addButton";
            _addButton.Click += new EventHandler(this.OnClickAddButton);
            _list.DisplayMode = BulletedListDisplayMode.HyperLink;
            _list.ID = "list";

            Controls.Add(nameLabel);
            Controls.Add(_nameTextBox);
            Controls.Add(breakLiteral1);

            Controls.Add(urlLabel);
            Controls.Add(_urlTextBox);
            Controls.Add(breakLiteral2);

            Controls.Add(_addButton);
            Controls.Add(breakLiteral3);

            Controls.Add(_list);
        }

        private void OnClickAddButton(object sender, EventArgs e)
        {
            string name = _nameTextBox.Text.Trim();
            string url = _urlTextBox.Text.Trim();

            Pair p = new Pair(name, url);
            if (WebPartManager.Personalization.Scope == PersonalizationScope.Shared)
            {
                _sharedUrls ??= new ArrayList();
                _sharedUrls.Add(p);
            }
            else
            {
                _userUrls ??= new ArrayList();
                _userUrls.Add(p);
            }

            OnUrlAdded();
        }

        protected virtual void OnUrlAdded()
        {
            _listDirty = true;
            ChildControlsCreated = false;
        }

        protected override void RenderContents(HtmlTextWriter writer)
        {
            if (_sharedUrls != null)
            {
                foreach (Pair p in _sharedUrls)
                {
                    _list.Items.Add(new ListItem((string)p.First, (string)p.Second));
                }
            }
            if (_userUrls != null)
            {
                foreach (Pair p in _userUrls)
                {
                    _list.Items.Add(new ListItem((string)p.First, (string)p.Second));
                }
            }

            base.RenderContents(writer);
        }

        public virtual bool IsDirty
        {
            get
            {
                return _listDirty;
            }
        }
        public new virtual void Load(PersonalizationDictionary state)
        {
            if (state != null)
            {
                PersonalizationEntry sharedUrlsEntry = state["sharedUrls"];
                if (sharedUrlsEntry != null)
                {
                    _sharedUrls = (ArrayList)sharedUrlsEntry.Value;
                }

                PersonalizationEntry userUrlsEntry = state["userUrls"];
                if (userUrlsEntry != null)
                {
                    _userUrls = (ArrayList)userUrlsEntry.Value;
                }
            }
        }

        public virtual void Save(PersonalizationDictionary state)
        {
            if ((_sharedUrls != null) && (_sharedUrls.Count != 0))
            {
                state["sharedUrls"] = new PersonalizationEntry(_sharedUrls, PersonalizationScope.Shared);
            }
            if ((_userUrls != null) && (_userUrls.Count != 0))
            {
                state["userUrls"] = new PersonalizationEntry(_userUrls, PersonalizationScope.User);
            }
        }
    }
}

Imports System.Collections
Imports System.ComponentModel
Imports System.Diagnostics
Imports System.Drawing
Imports System.Web
Imports System.Web.UI
Imports System.Security.Permissions
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.WebParts

Namespace Samples.AspNet.VB.Controls

  <AspNetHostingPermission(SecurityAction.Demand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  <AspNetHostingPermission(SecurityAction.InheritanceDemand, _
    Level:=AspNetHostingPermissionLevel.Minimal)> _
  Public Class UrlListWebPart
      Inherits WebPart
      Implements IPersonalizable
      Private _sharedUrls As ArrayList
      Private _userUrls As ArrayList
      Private _listDirty As Boolean

      Private _nameTextBox As TextBox
      Private _urlTextBox As TextBox
      Private _addButton As Button
      Private _list As BulletedList


      Protected Overrides Sub CreateChildControls()
          Dim nameLabel As New Label()
          Dim urlLabel As New Label()
          Dim breakLiteral1 As New LiteralControl("<br />")
          Dim breakLiteral2 As New LiteralControl("<br />")
          Dim breakLiteral3 As New LiteralControl("<br />")

          _nameTextBox = New TextBox()
          _urlTextBox = New TextBox()
          _addButton = New Button()
          _list = New BulletedList()

          nameLabel.Text = "Name: "
          urlLabel.Text = "URL: "
          _nameTextBox.ID = "nameTextBox"
          _urlTextBox.ID = "urlTextBox"
          _addButton.Text = "Add"
          _addButton.ID = "addButton"
          AddHandler _addButton.Click, AddressOf Me.OnClickAddButton
          _list.DisplayMode = BulletedListDisplayMode.HyperLink
          _list.ID = "list"

          Controls.Add(nameLabel)
          Controls.Add(_nameTextBox)
          Controls.Add(breakLiteral1)

          Controls.Add(urlLabel)
          Controls.Add(_urlTextBox)
          Controls.Add(breakLiteral2)

          Controls.Add(_addButton)
          Controls.Add(breakLiteral3)

          Controls.Add(_list)

      End Sub


      Private Sub OnClickAddButton(ByVal sender As Object, ByVal e As EventArgs)
          Dim name As String = _nameTextBox.Text.Trim()
          Dim url As String = _urlTextBox.Text.Trim()

          Dim p As New Pair(name, url)
          If WebPartManager.Personalization.Scope = PersonalizationScope.Shared Then
              If _sharedUrls Is Nothing Then
                  _sharedUrls = New ArrayList()
              End If
              _sharedUrls.Add(p)
          Else
              If _userUrls Is Nothing Then
                  _userUrls = New ArrayList()
              End If
              _userUrls.Add(p)
          End If

          OnUrlAdded()

      End Sub


      Protected Overridable Sub OnUrlAdded()
          _listDirty = True
          ChildControlsCreated = False

      End Sub


      Protected Overrides Sub RenderContents(ByVal writer As HtmlTextWriter)
          If Not (_sharedUrls Is Nothing) Then
              Dim p As Pair
              For Each p In _sharedUrls
                  _list.Items.Add(New ListItem(CStr(p.First), CStr(p.Second)))
              Next p
          End If
          If Not (_userUrls Is Nothing) Then
              Dim p As Pair
              For Each p In _userUrls
                  _list.Items.Add(New ListItem(CStr(p.First), CStr(p.Second)))
              Next p
          End If

          MyBase.RenderContents(writer)

      End Sub


      Public Overridable ReadOnly Property IsDirty() As Boolean _
        Implements IPersonalizable.IsDirty
          Get
              Return _listDirty
          End Get
      End Property

      Public Overridable Shadows Sub Load(ByVal state As PersonalizationDictionary) _
        Implements IPersonalizable.Load
          If Not (state Is Nothing) Then
              Dim sharedUrlsEntry As PersonalizationEntry = state("sharedUrls")
              If Not (sharedUrlsEntry Is Nothing) Then
                  _sharedUrls = CType(sharedUrlsEntry.Value, ArrayList)
              End If

              Dim userUrlsEntry As PersonalizationEntry = state("userUrls")
              If Not (userUrlsEntry Is Nothing) Then
                  _userUrls = CType(userUrlsEntry.Value, ArrayList)
              End If
          End If

      End Sub

      Public Overridable Sub Save(ByVal state As PersonalizationDictionary) _
        Implements IPersonalizable.Save
          If Not (_sharedUrls Is Nothing) AndAlso _sharedUrls.Count <> 0 Then
              state("sharedUrls") = New PersonalizationEntry(_sharedUrls, PersonalizationScope.Shared)
          End If
          If Not (_userUrls Is Nothing) AndAlso _userUrls.Count <> 0 Then
              state("userUrls") = New PersonalizationEntry(_userUrls, PersonalizationScope.User)
          End If

      End Sub
  End Class


End Namespace

Comentarios

Se llama a este método en un control para permitirle cargar datos personalizados en sí mismo. También puede devolver un valor que indica si el estado personalizado de un control debe volver a escribirse en el almacén de datos subyacente, independientemente de si ha cambiado cualquier otro dato de personalización de la página. Un control puede establecer sus propias propiedades personalizadas y llevar a cabo lógica interna adicional basada en los valores contenidos en el diccionario de personalización. El conjunto de controles elementos web llama a este método al aplicar datos de personalización a un control.

También debe tener en cuenta el comportamiento de combinación de Userpropiedades de ámbito frente Shareda propiedades con ámbito contenidas en el PersonalizationDictionary objeto . El state parámetro contiene una representación combinada de datos personalizados que se cargó desde el almacén de datos subyacente. En Shared el ámbito, todos los valores que se agregaron anteriormente cuando la propia página estaba en Shared el ámbito estaría disponible. En User el ámbito, si un valor asociado al User ámbito de personalización tenía un valor agregado cuando la página estaba en Shared el ámbito y un valor diferente cuando la página estaba en User el ámbito, la infraestructura de personalización solo incluiría el Uservalor -scoped (en lugar del valor de ámbito) dentro del Shared state parámetro .

Se aplica a