IPersonalizable.IsDirty Property
Definition
Important
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Gets a value that indicates whether the custom data that a control manages has changed.
public:
property bool IsDirty { bool get(); };public bool IsDirty { get; }member this.IsDirty : boolPublic ReadOnly Property IsDirty As BooleanProperty Value
true if the custom data managed with the IPersonalizable interface has changed; otherwise, false.
Examples
The following code example demonstrates use of the IsDirty property. The first part of the example is the Web page that hosts a WebPart control.
<%@ Page Language="C#" %>
<%@ Register TagPrefix="dict"
namespace="Samples.AspNet.CS.Controls" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>IPersonalizable</title>
</head>
<body>
<form id="form1" runat="server">
<asp:WebPartManager ID="mgr" runat="server" />
<div>
<asp:WebPartZone ID="WebPartZone1" runat="server">
<ZoneTemplate>
<dict:urllistwebpart id="listwp1" runat="server"
title="URL List WebPart" />
</ZoneTemplate>
</asp:WebPartZone>
</div>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<%@ Register TagPrefix="dict"
namespace="Samples.AspNet.VB.Controls" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>IPersonalizable</title>
</head>
<body>
<form id="form1" runat="server">
<asp:WebPartManager ID="mgr" runat="server" />
<div>
<asp:WebPartZone ID="WebPartZone1" runat="server">
<ZoneTemplate>
<dict:urllistwebpart id="listwp1" runat="server"
title="URL List WebPart" />
</ZoneTemplate>
</asp:WebPartZone>
</div>
</form>
</body>
</html>
The second part of the example is the code for the custom WebPart control called UrlListWebPart. This file should be placed in the App_Code directory to run the example. Note that the source code implements the IsDirty property.
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
Load the page in a browser. Type in a name to represent a URL, then add an actual URL beginning with http://, and click the Add button to add the URL.
Remarks
When data managed by a control has changed, the control is considered "dirty." A control should return true if the custom data that it manages through the IPersonalizable interface has changed. If a control returns true from this property, the control's Save interface method implementation is called during property value extraction.
Note
This property is checked automatically by the personalization infrastructure during the latter phases of processing a POST request. However, for GET requests, the value returned from the IsDirty property is not checked. Some other event has to have caused the control to be considered "dirty" for any control state--not just data managed by IPersonalizable--to be saved. If a control can mark itself as "dirty" during a GET request, or if the personalization infrastructure under some very specific boundary conditions considers a control "dirty" during a GET request, then Save will always be called.
A control can reference its associated WebPartManager control and check the Scope property to determine the current scope. The "dirty" state of a control's custom data should be appropriate for the current scope.
Applies to
Collabora con noi su GitHub
L'origine di questo contenuto è disponibile in GitHub, in cui è anche possibile creare ed esaminare i problemi e le richieste pull. Per ulteriori informazioni, vedere la guida per i collaboratori.
