ControlParser Classe
Definição
Importante
Algumas informações se referem a produtos de pré-lançamento que podem ser substancialmente modificados antes do lançamento. A Microsoft não oferece garantias, expressas ou implícitas, das informações aqui fornecidas.
public ref class ControlParser sealedpublic sealed class ControlParsertype ControlParser = classPublic NotInheritable Class ControlParser- Herança
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ControlParser
Exemplos
O exemplo de código a seguir mostra como obter a marcação HTML para um controle em uma página usando a ControlPersister classe e como instanciar um controle dele usando a ControlParser classe . O exemplo também mostra como exibir caixas de diálogo do Microsoft Windows de um designer.
#using <System.dll>
#using <System.Drawing.dll>
#using <System.Web.dll>
#using <System.Design.dll>
#using <System.Windows.Forms.dll>
using namespace System;
using namespace System::Drawing;
using namespace System::Drawing::Design;
using namespace System::IO;
using namespace System::Web::UI;
using namespace System::Web::UI::Design;
using namespace System::Web::UI::WebControls;
using namespace System::ComponentModel;
using namespace System::ComponentModel::Design;
using namespace System::Windows::Forms;
using namespace System::Windows::Forms::Design;
// Provides a form with a multiline text box display.
private ref class StringDisplayForm: public Form
{
public:
StringDisplayForm( String^ displayText )
{
this->Size = System::Drawing::Size( 400, 400 );
this->Text = "Control Persistence String";
this->SuspendLayout();
System::Windows::Forms::TextBox^ tbox = gcnew System::Windows::Forms::TextBox;
tbox->Multiline = true;
tbox->Size = System::Drawing::Size( this->Width - 40, this->Height - 90 );
tbox->Text = displayText;
this->Controls->Add( tbox );
System::Windows::Forms::Button^ okButton = gcnew System::Windows::Forms::Button;
okButton->Text = "OK";
okButton->Size = System::Drawing::Size( 80, 24 );
okButton->Location = Point(this->Width - 100,this->Height - 60);
okButton->Anchor = AnchorStyles(AnchorStyles::Bottom | AnchorStyles::Right);
okButton->DialogResult = ::DialogResult::OK;
this->Controls->Add( okButton );
this->ResumeLayout();
}
};
// Provides a form with a list for selection.
private ref class ControlSelectionForm: public Form
{
private:
array<System::Web::UI::Control^>^controlArray;
public:
System::Windows::Forms::ListBox^ controlList;
ControlSelectionForm( array<System::Web::UI::Control^>^controlArray )
{
this->controlArray = controlArray;
this->Size = System::Drawing::Size( 400, 500 );
this->Text = "Control Persister Selection Form";
this->SuspendLayout();
System::Windows::Forms::Label ^ label1 = gcnew System::Windows::Forms::Label;
label1->Text = "Select the control to persist:";
label1->Size = System::Drawing::Size( 240, 20 );
label1->Location = Point(10,10);
this->Controls->Add( label1 );
controlList = gcnew System::Windows::Forms::ListBox;
controlList->Size = System::Drawing::Size( 370, 400 );
controlList->Location = Point(10,30);
controlList->Anchor = AnchorStyles(AnchorStyles::Left | AnchorStyles::Top | AnchorStyles::Bottom | AnchorStyles::Right);
this->Controls->Add( controlList );
System::Windows::Forms::Button^ okButton = gcnew System::Windows::Forms::Button;
okButton->Text = "OK";
okButton->Size = System::Drawing::Size( 80, 24 );
okButton->Location = Point(this->Width - 100,this->Height - 60);
okButton->Anchor = AnchorStyles(AnchorStyles::Bottom | AnchorStyles::Right);
okButton->DialogResult = ::DialogResult::OK;
this->Controls->Add( okButton );
System::Windows::Forms::Button^ cancelButton = gcnew System::Windows::Forms::Button;
cancelButton->Text = "Cancel";
cancelButton->Size = System::Drawing::Size( 80, 24 );
cancelButton->Location = Point(this->Width - 200,this->Height - 60);
cancelButton->Anchor = AnchorStyles(AnchorStyles::Bottom | AnchorStyles::Right);
cancelButton->DialogResult = ::DialogResult::Cancel;
this->Controls->Add( cancelButton );
for ( int i = 0; i < controlArray->Length; i++ )
controlList->Items->Add( controlArray[ i ]->UniqueID );
this->ResumeLayout();
}
};
// Provides a form with a multiline text box for input.
private ref class StringInputForm: public Form
{
public:
System::Windows::Forms::TextBox^ tbox;
StringInputForm()
{
this->Size = System::Drawing::Size( 400, 400 );
this->Text = "Input Control Persistence String";
this->SuspendLayout();
tbox = gcnew System::Windows::Forms::TextBox;
tbox->Multiline = true;
tbox->Size = System::Drawing::Size( this->Width - 40, this->Height - 90 );
tbox->Text = "";
this->Controls->Add( tbox );
System::Windows::Forms::Button^ okButton = gcnew System::Windows::Forms::Button;
okButton->Text = "OK";
okButton->Size = System::Drawing::Size( 80, 24 );
okButton->Location = Point(this->Width - 100,this->Height - 60);
okButton->Anchor = AnchorStyles(AnchorStyles::Bottom | AnchorStyles::Right);
okButton->DialogResult = ::DialogResult::OK;
this->Controls->Add( okButton );
System::Windows::Forms::Button^ cancelButton = gcnew System::Windows::Forms::Button;
cancelButton->Text = "Cancel";
cancelButton->Size = System::Drawing::Size( 80, 24 );
cancelButton->Location = Point(this->Width - 200,this->Height - 60);
cancelButton->Anchor = AnchorStyles(AnchorStyles::Bottom | AnchorStyles::Right);
cancelButton->DialogResult = ::DialogResult::Cancel;
this->Controls->Add( cancelButton );
this->ResumeLayout();
}
};
// Web control designer provides an interface
// to use the ControlPersister and ControlParser.
public ref class ControlParserPersisterDesigner: public System::Web::UI::Design::ControlDesigner
{
public:
ControlParserPersisterDesigner()
: ControlDesigner()
{}
property System::ComponentModel::Design::DesignerVerbCollection^ Verbs
{
// Provides designer verb menu commands to
// persist a control and to load a persisted control.
[System::Security::Permissions::PermissionSetAttribute(System::Security::Permissions::SecurityAction::Demand, Name="FullTrust")]
virtual System::ComponentModel::Design::DesignerVerbCollection^ get() override
{
DesignerVerbCollection^ dvc = gcnew DesignerVerbCollection;
dvc->Add( gcnew DesignerVerb( "Load Persisted Control...",gcnew EventHandler( this, &ControlParserPersisterDesigner::loadPersistedControl ) ) );
dvc->Add( gcnew DesignerVerb( "Parse and Save Control...",gcnew EventHandler( this, &ControlParserPersisterDesigner::saveControl ) ) );
return dvc;
}
}
private:
// Displays a textbox form to receive an HTML
// String* that represents a control, and creates
// a toolbox item for the control, if not already
// present in the selected toolbox category.
void loadPersistedControl( Object^ /*sender*/, EventArgs^ /*e*/ )
{
// Display a StringInputForm to obtain a persisted control String*.
StringInputForm^ inputForm = gcnew StringInputForm;
if ( inputForm->ShowDialog() != DialogResult::OK )
return;
if ( inputForm->tbox->Text->Length < 2 )
return;
// Obtain an IDesignerHost* for the design-mode document.
IDesignerHost^ host = dynamic_cast<IDesignerHost^>(this->Component->Site->GetService( IDesignerHost::typeid ));
// Create a Web control from the persisted control String*.
System::Web::UI::Control^ ctrl = ControlParser::ParseControl( host, inputForm->tbox->Text->Trim() );
// Create a Web control toolbox item for the type of the control
WebControlToolboxItem^ item = gcnew WebControlToolboxItem( ctrl->GetType() );
// Add the Web control toolbox item to the toolbox
IToolboxService^ toolService = dynamic_cast<IToolboxService^>(this->Component->Site->GetService( IToolboxService::typeid ));
if ( toolService != nullptr )
toolService->AddToolboxItem( item );
else
throw gcnew Exception( "IToolboxService* was not found." );
}
// Displays a list of controls in the project, if any,
// and displays the HTML representing the persisted, selected control.
void saveControl( Object^ /*sender*/, EventArgs^ /*e*/ )
{
// Get the collection of components in the current
// design mode document.
ComponentCollection^ documentComponents = this->Component->Site->Container->Components;
// Filter the components to those that derive from the
// System::Web::UI::Control class.
// Create an IComponent* array of the maximum possible length needed.
array<IComponent^>^filterArray = gcnew array<IComponent^>(documentComponents->Count);
// Count the total qualifying components.
int total = 0;
for ( int i = 0; i < documentComponents->Count; i++ )
{
// If the component derives from System::Web::UI::Control,
// copy a reference to the control to the filterArray
// array and increment the control count.
if ( System::Web::UI::Control::typeid->IsAssignableFrom( documentComponents[i]->GetType() ) )
{
if ( (dynamic_cast<System::Web::UI::Control^>(documentComponents[i]))->UniqueID != nullptr )
{
filterArray[total] = documentComponents[i];
total++;
}
}
}
if ( total == 0 )
throw gcnew Exception( "Document contains no System::Web::UI::Control components." );
// Move the components that derive from System::Web::UI::Control to a
// new array of the correct size.
array<System::Web::UI::Control^>^controlArray = gcnew array<System::Web::UI::Control^>(total);
for ( int i = 0; i < total; i++ )
controlArray[i] = dynamic_cast<System::Web::UI::Control^>(filterArray[i]);
// Create a ControlSelectionForm to provide a persistence
// configuration interface.
ControlSelectionForm^ selectionForm = gcnew ControlSelectionForm( controlArray );
// Display the form.
if ( selectionForm->ShowDialog() != DialogResult::OK )
return;
// Validate the selection.
if ( selectionForm->controlList->SelectedIndex == -1 )
throw gcnew Exception( "You must select a control to persist." );
// Parse the selected control.
String^ persistedData = ControlPersister::PersistControl( controlArray[ selectionForm->controlList->SelectedIndex ] );
// Display the control persistence String* in a text box.
StringDisplayForm^ displayForm = gcnew StringDisplayForm( persistedData );
displayForm->ShowDialog();
}
};
// Simple text display control hosts the ControlParserPersisterDesigner.
[DesignerAttribute(ControlParserPersisterDesigner::typeid,IDesigner::typeid)]
public ref class ControlParserPersisterDesignerControl: public WebControl
{
private:
String^ text;
public:
property String^ Text
{
[Bindable(true),
Category("Appearance"),
DefaultValue("")]
String^ get()
{
return text;
}
void set( String^ value )
{
text = value;
}
}
ControlParserPersisterDesignerControl()
: WebControl()
{
text = "Right-click here to access control persistence methods in design mode";
}
protected:
virtual void Render( HtmlTextWriter^ output ) override
{
output->Write( Text );
}
};
using System;
using System.Drawing;
using System.Drawing.Design;
using System.Web.UI;
using System.Web.UI.Design;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Windows.Forms;
using System.Windows.Forms.Design;
namespace ControlParserPersisterDesignerControl_CS
{
// Web control designer provides an interface
// to use the ControlPersister and ControlParser.
// The DesignerActionListCollection must run under "FullTrust",
// so you must also require your designer to run under "FullTrust".
[System.Security.Permissions.PermissionSetAttribute(
System.Security.Permissions.SecurityAction.InheritanceDemand,
Name = "FullTrust")]
[System.Security.Permissions.PermissionSetAttribute(
System.Security.Permissions.SecurityAction.Demand,
Name = "FullTrust")]
public class ControlParserPersisterDesigner :
System.Web.UI.Design.ControlDesigner
{
private DesignerActionListCollection _actLists = null;
public ControlParserPersisterDesigner()
: base()
{}
// Creates designer menu commands to persist
// a control and to load a persisted control.
public override DesignerActionListCollection ActionLists
{
get
{
if (_actLists == null)
{
_actLists = new DesignerActionListCollection();
_actLists.AddRange(base.ActionLists);
_actLists.Add(new ParserActionList(this));
}
return _actLists;
}
}
// A custom class for the DesignerActionList
private class ParserActionList : DesignerActionList
{
private ControlParserPersisterDesigner _parent;
private DesignerActionItemCollection _items;
public ParserActionList(ControlParserPersisterDesigner parent) :
base(parent.Component)
{
_parent = parent;
}
public override DesignerActionItemCollection GetSortedActionItems()
{
if (_items == null)
{
// Create the collection
_items = new DesignerActionItemCollection();
_items.Add(new DesignerActionMethodItem(this, "saveControl", "Parse and Save Control...", true));
_items.Add(new DesignerActionMethodItem(this, "loadPersistedControl", "Load Persisted Control...", true));
}
return _items;
}
// Displays a list of controls in the project, if any,
// and displays the HTML markup for the selected control.
private void saveControl()
{
// Get the collection of components in the current
// design mode document.
ComponentCollection documentComponents =
this.Component.Site.Container.Components;
// Filter the components to those that derive from the
// System.Web.UI.Control class.
// Create an IComponent array of the maximum possible length needed.
IComponent[] filterArray = new IComponent[documentComponents.Count];
// Count the total qualifying components.
int total = 0;
for (int i = 0; i < documentComponents.Count; i++)
{
// If the component derives from System.Web.UI.Control,
// copy a reference to the control to the filterArray
// array and increment the control count.
if (typeof(System.Web.UI.Control).IsAssignableFrom(
documentComponents[i].GetType()))
{
if (((System.Web.UI.Control)documentComponents[i]).UniqueID
!= null)
{
filterArray[total] = documentComponents[i];
total++;
}
}
}
if (total == 0)
throw new Exception(
"Document contains no System.Web.UI.Control components.");
// Move the components that derive from System.Web.UI.Control to a
// new array of the correct size.
System.Web.UI.Control[] controlArray =
new System.Web.UI.Control[total];
for (int i = 0; i < total; i++)
controlArray[i] = (System.Web.UI.Control)filterArray[i];
// Create a ControlSelectionForm to select a control.
ControlSelectionForm selectionForm =
new ControlSelectionForm(controlArray);
// Display the form.
if (selectionForm.ShowDialog() != DialogResult.OK)
return;
// Validate the selection.
if (selectionForm.controlList.SelectedIndex == -1)
throw new Exception("You must select a control to persist.");
// Parse the selected control into a persistence string.
string persistedData = ControlPersister.PersistControl(
controlArray[selectionForm.controlList.SelectedIndex]);
// Display the persistence string in a text box.
StringDisplayForm displayForm =
new StringDisplayForm(persistedData);
displayForm.ShowDialog();
}
// Displays a textbox form to receive an HTML
// string that represents a control, and creates
// a toolbox item for the control, if not already
// present in the selected toolbox category.
private void loadPersistedControl()
{
// Display a StringInputForm to obtain a persisted control string.
StringInputForm inputForm = new StringInputForm();
if (inputForm.ShowDialog() != DialogResult.OK)
return;
if (inputForm.TBox.Text.Length < 2)
return;
// Obtain an IDesignerHost for the design-mode document.
IDesignerHost host = (IDesignerHost)
this.Component.Site.GetService(typeof(IDesignerHost));
// Create a Web control from the HTML markup.
System.Web.UI.Control ctrl =
ControlParser.ParseControl(host, inputForm.TBox.Text.Trim());
// Create a Web control toolbox item for the type of the control
System.Web.UI.Design.WebControlToolboxItem item =
new System.Web.UI.Design.WebControlToolboxItem(ctrl.GetType());
// Add the Web control toolbox item to the toolbox
IToolboxService toolService = (IToolboxService)
this.Component.Site.GetService(typeof(IToolboxService));
if (toolService != null)
toolService.AddToolboxItem(item);
else
throw new Exception("IToolboxService was not found.");
}
}
}
// Simple text display control hosts the ControlParserPersisterDesigner.
[DesignerAttribute(typeof(ControlParserPersisterDesigner),
typeof(IDesigner))]
public class ControlParserPersisterDesignerControl :
System.Web.UI.WebControls.WebControl
{
private string _text;
[Bindable(true),
Category("Appearance"),
DefaultValue("")]
public string Text
{
get { return _text; }
set { _text = value; }
}
public ControlParserPersisterDesignerControl()
: base()
{
_text = "Right-click here to access control persistence " +
"methods in design mode";
}
protected override void Render(HtmlTextWriter output)
{
output.Write(Text);
}
}
// Provides a form with a list for selection.
internal class ControlSelectionForm : Form
{
private System.Web.UI.Control[] controlArray;
public System.Windows.Forms.ListBox controlList;
public ControlSelectionForm(System.Web.UI.Control[] controlArray)
{
this.controlArray = controlArray;
this.Size = new Size(400, 500);
this.Text = "Control Selection Form";
this.SuspendLayout();
System.Windows.Forms.Label label1 =
new System.Windows.Forms.Label();
label1.Text = "Select a control to parse:";
label1.Size = new Size(240, 20);
label1.Location = new Point(10, 10);
this.Controls.Add(label1);
controlList = new System.Windows.Forms.ListBox();
controlList.Size = new Size(370, 400);
controlList.Location = new Point(10, 30);
controlList.Anchor = AnchorStyles.Left | AnchorStyles.Top |
AnchorStyles.Bottom | AnchorStyles.Right;
this.Controls.Add(controlList);
System.Windows.Forms.Button okButton =
new System.Windows.Forms.Button();
okButton.Text = "OK";
okButton.Size = new Size(80, 24);
okButton.Location =
new Point(this.Width - 100, this.Height - 60);
okButton.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;
okButton.DialogResult = DialogResult.OK;
this.Controls.Add(okButton);
System.Windows.Forms.Button cancelButton =
new System.Windows.Forms.Button();
cancelButton.Text = "Cancel";
cancelButton.Size = new Size(80, 24);
cancelButton.Location =
new Point(this.Width - 200, this.Height - 60);
cancelButton.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;
cancelButton.DialogResult = DialogResult.Cancel;
this.Controls.Add(cancelButton);
for (int i = 0; i < controlArray.Length; i++)
controlList.Items.Add(controlArray[i].UniqueID);
this.ResumeLayout();
}
}
// Provides a form with a multiline text box display.
internal class StringDisplayForm : Form
{
private System.Windows.Forms.TextBox tbox =
new System.Windows.Forms.TextBox();
public System.Windows.Forms.TextBox TBox
{
get { return tbox; }
set { tbox = value; }
}
public StringDisplayForm(string displayText)
{
this.Size = new Size(400, 300);
this.Text = "Control Persistence String";
this.SuspendLayout();
TBox.Multiline = true;
TBox.Size = new Size(this.Width - 40, this.Height - 90);
TBox.Text = displayText;
this.Controls.Add(TBox);
System.Windows.Forms.Button okButton =
new System.Windows.Forms.Button();
okButton.Text = "OK";
okButton.Size = new Size(80, 24);
okButton.Location =
new Point(this.Width - 100, this.Height - 60);
okButton.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;
okButton.DialogResult = DialogResult.OK;
this.Controls.Add(okButton);
this.ResumeLayout();
}
}
// Provides a form with a multiline text box for input.
internal class StringInputForm : System.Windows.Forms.Form
{
private System.Windows.Forms.TextBox tbox =
new System.Windows.Forms.TextBox();
public System.Windows.Forms.TextBox TBox
{
get { return tbox; }
}
public StringInputForm()
{
this.Size = new Size(400, 300);
this.Text = "Input Control Persistence String";
this.SuspendLayout();
tbox = new System.Windows.Forms.TextBox();
tbox.Multiline = true;
tbox.Size = new Size(this.Width - 40, this.Height - 90);
tbox.Text = "";
this.Controls.Add(tbox);
System.Windows.Forms.Button okButton =
new System.Windows.Forms.Button();
okButton.Text = "OK";
okButton.Size = new Size(80, 24);
okButton.Location =
new Point(this.Width - 100, this.Height - 60);
okButton.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;
okButton.DialogResult = DialogResult.OK;
this.Controls.Add(okButton);
System.Windows.Forms.Button cancelButton =
new System.Windows.Forms.Button();
cancelButton.Text = "Cancel";
cancelButton.Size = new Size(80, 24);
cancelButton.Location =
new Point(this.Width - 200, this.Height - 60);
cancelButton.Anchor = AnchorStyles.Bottom | AnchorStyles.Right;
cancelButton.DialogResult = DialogResult.Cancel;
this.Controls.Add(cancelButton);
this.ResumeLayout();
}
}
}
Imports System.Drawing
Imports System.Drawing.Design
Imports System.Web.UI
Imports System.Web.UI.Design
Imports System.Web.UI.WebControls
Imports System.ComponentModel
Imports System.ComponentModel.Design
Imports System.Windows.Forms
Imports System.Windows.Forms.Design
Namespace ControlParserPersisterDesignerControl_VB
' Web control designer provides an interface
' to use the ControlPersister and ControlParser.
' The DesignerActionListCollection must run under "FullTrust",
' so you must also require your designer to run under "FullTrust".
<System.Security.Permissions.PermissionSetAttribute( _
System.Security.Permissions.SecurityAction.InheritanceDemand, _
Name:="FullTrust")> _
<System.Security.Permissions.PermissionSetAttribute( _
Security.Permissions.SecurityAction.Demand, _
Name:="FullTrust")> _
Public Class ControlParserPersisterDesigner
Inherits System.Web.UI.Design.ControlDesigner
Private _actLists As DesignerActionListCollection
Public Sub New()
End Sub
' Creates designer menu commands to persist
' a control and to load a persisted control.
Public Overrides ReadOnly Property ActionLists() As System.ComponentModel.Design.DesignerActionListCollection
Get
If IsNothing(_actLists) Then
_actLists = New DesignerActionListCollection()
_actLists.AddRange(MyBase.ActionLists)
_actLists.Add(New ParserActionList(Me))
End If
Return _actLists
End Get
End Property
'Public Overrides ReadOnly Property Verbs() _
'As System.ComponentModel.Design.DesignerVerbCollection
' Get
' Dim dvc As New DesignerVerbCollection()
' dvc.Add(New DesignerVerb("Load Persisted Control...", _
' New EventHandler(AddressOf Me.loadPersistedControl)))
' dvc.Add(New DesignerVerb("Parse and Save Control...", _
' New EventHandler(AddressOf Me.saveControl)))
' Return dvc
' End Get
'End Property
' Displays a textbox form to receive an HTML
' string that represents a control, and creates
' a toolbox item for the control, if not already
' present in the selected toolbox category.
Private Class ParserActionList
Inherits DesignerActionList
Private _parent As ControlParserPersisterDesigner
Private _items As DesignerActionItemCollection
Public Sub New(ByVal parent As ControlParserPersisterDesigner)
MyBase.New(parent.Component)
_parent = parent
End Sub
Public Overrides Function GetSortedActionItems() As System.ComponentModel.Design.DesignerActionItemCollection
If IsNothing(_items) Then
_items = New DesignerActionItemCollection()
_items.Add(New DesignerActionMethodItem(Me, "saveControl", "Parse and Save Control...", True))
_items.Add(New DesignerActionMethodItem(Me, "loadPersistedControl", "Load Persisted Control...", True))
End If
Return _items
End Function
' Displays a list of controls in the project, if any,
' and displays the HTML markup for the selected control.
Private Sub saveControl()
' Get the collection of components in the current
' design mode document.
Dim documentComponents As ComponentCollection = _
Me.Component.Site.Container.Components
' Filter the components to those that derive from the
' System.Web.UI.Control class.
' Create an IComponent array of the maximum possible length needed.
Dim filterArray(documentComponents.Count) As IComponent
' Count the total qualifying components.
Dim total As Integer = 0
Dim i As Integer
For i = 0 To documentComponents.Count - 1
' If the component derives from System.Web.UI.Control,
' copy a reference to the control to the filterArray
' array and increment the control count.
If GetType(System.Web.UI.Control).IsAssignableFrom(CType(documentComponents(i), Object).GetType()) Then
If Not (CType(documentComponents(i), System.Web.UI.Control).UniqueID Is Nothing) Then
filterArray(total) = documentComponents(i)
total += 1
End If
End If
Next i
If total = 0 Then
Throw New Exception( _
"Document contains no System.Web.UI.Control components.")
End If
' Move the components that derive from System.Web.UI.Control to a
' new array of the correct size.
Dim controlArray(total - 1) As System.Web.UI.Control
For i = 0 To total - 1
controlArray(i) = CType(filterArray(i), System.Web.UI.Control)
Next i
' Create a ControlSelectionForm to provide a persistence
' configuration interface.
Dim selectionForm As New ControlSelectionForm(controlArray)
' Display the form.
If selectionForm.ShowDialog() <> DialogResult.OK Then
Return
End If
' Validate the selection.
If selectionForm.controlList.SelectedIndex = -1 Then
Throw New Exception("You must select a control to persist.")
End If
' Parse the selected control.
Dim persistedData As String = ControlPersister.PersistControl( _
controlArray(selectionForm.controlList.SelectedIndex))
' Display the control persistence string in a text box.
Dim displayForm As New StringDisplayForm(persistedData)
displayForm.ShowDialog()
End Sub
' Displays a textbox form to receive an HTML
' string that represents a control, and creates
' a toolbox item for the control, if not already
' present in the selected toolbox category.
Private Sub loadPersistedControl()
' Display a StringInputForm to obtain a persisted control string.
Dim inputForm As New StringInputForm()
If inputForm.ShowDialog() <> DialogResult.OK Then
Return
End If
If inputForm.TxBox.Text.Length < 2 Then
Return
End If
' Obtain an IDesignerHost for the design-mode document.
Dim host As IDesignerHost = CType(Me.Component.Site.GetService(GetType(IDesignerHost)), IDesignerHost)
' Create a Web control from the persisted control string.
Dim ctrl As System.Web.UI.Control = ControlParser.ParseControl(host, inputForm.TxBox.Text.Trim())
' Create a Web control toolbox item for the type of the control.
Dim item As New System.Web.UI.Design.WebControlToolboxItem(ctrl.GetType())
' Add the Web control toolbox item to the toolbox.
Dim toolService As IToolboxService = CType(Me.Component.Site.GetService(GetType(IToolboxService)), IToolboxService)
If Not (toolService Is Nothing) Then
toolService.AddToolboxItem(item)
Else
Throw New Exception("IToolboxService was not found.")
End If
End Sub
End Class
End Class
' Simple text display control hosts the ControlParserPersisterDesigner.
<DesignerAttribute(GetType(ControlParserPersisterDesigner), _
GetType(IDesigner))> _
Public Class ControlParserPersisterDesignerControl
Inherits System.Web.UI.WebControls.WebControl
Private _text As String
<Bindable(True), _
Category("Appearance"), _
DefaultValue("")> _
Public Property [Text]() As String
Get
Return _text
End Get
Set(ByVal Value As String)
_text = Value
End Set
End Property
Public Sub New()
[Text] = "Right-click here to access control persistence " & _
"methods in design mode"
End Sub
Protected Overrides Sub Render(ByVal output As HtmlTextWriter)
output.Write([Text])
End Sub
End Class
' Provides a form with a list for selection.
Friend Class ControlSelectionForm
Inherits System.Windows.Forms.Form
Private controlArray() As System.Web.UI.Control
Public controlList As System.Windows.Forms.ListBox
Public Sub New(ByVal controlArray() As System.Web.UI.Control)
Me.controlArray = controlArray
Me.Size = New Size(400, 500)
Me.Text = "Control Persister Selection Form"
Me.SuspendLayout()
Dim label1 As New System.Windows.Forms.Label()
label1.Text = "Select the control to persist:"
label1.Size = New Size(240, 20)
label1.Location = New Point(10, 10)
Me.Controls.Add(label1)
controlList = New System.Windows.Forms.ListBox()
controlList.Size = New Size(370, 400)
controlList.Location = New Point(10, 30)
controlList.Anchor = AnchorStyles.Left Or AnchorStyles.Top _
Or AnchorStyles.Bottom Or AnchorStyles.Right
Me.Controls.Add(controlList)
Dim okButton As New System.Windows.Forms.Button()
okButton.Text = "OK"
okButton.Size = New Size(80, 24)
okButton.Location = New Point(Me.Width - 100, Me.Height - 60)
okButton.Anchor = AnchorStyles.Bottom Or AnchorStyles.Right
okButton.DialogResult = DialogResult.OK
Me.Controls.Add(okButton)
Dim cancelButton As New System.Windows.Forms.Button()
cancelButton.Text = "Cancel"
cancelButton.Size = New Size(80, 24)
cancelButton.Location = New Point(Me.Width - 200, Me.Height - 60)
cancelButton.Anchor = AnchorStyles.Bottom Or AnchorStyles.Right
cancelButton.DialogResult = DialogResult.Cancel
Me.Controls.Add(cancelButton)
Dim i As Integer
For i = 0 To controlArray.Length - 1
controlList.Items.Add(controlArray(i).UniqueID)
Next i
Me.ResumeLayout()
End Sub
End Class
' Provides a form with a multiline text box display.
Friend Class StringDisplayForm
Inherits System.Windows.Forms.Form
Private tbox As New System.Windows.Forms.TextBox()
Public Property TxBox() As System.Windows.Forms.TextBox
Get
Return tbox
End Get
Set(ByVal value As System.Windows.Forms.TextBox)
tbox = value
End Set
End Property
Public Sub New(ByVal displayText As String)
Me.Size = New Size(400, 300)
Me.Text = "Control Persistence String"
Me.SuspendLayout()
Dim tbox As New System.Windows.Forms.TextBox()
tbox.Multiline = True
tbox.Size = New Size(Me.Width - 40, Me.Height - 90)
tbox.Text = displayText
Me.Controls.Add(tbox)
Dim okButton As New System.Windows.Forms.Button()
okButton.Text = "OK"
okButton.Size = New Size(80, 24)
okButton.Location = New Point(Me.Width - 100, Me.Height - 60)
okButton.Anchor = AnchorStyles.Bottom Or AnchorStyles.Right
okButton.DialogResult = DialogResult.OK
Me.Controls.Add(okButton)
Me.ResumeLayout()
End Sub
End Class
' Provides a form with a multiline text box for input.
Friend Class StringInputForm
Inherits System.Windows.Forms.Form
Private tbox As New System.Windows.Forms.TextBox()
Public Property TxBox() As System.Windows.Forms.TextBox
Get
Return tbox
End Get
Set(ByVal value As System.Windows.Forms.TextBox)
tbox = value
End Set
End Property
Public Sub New()
Me.Size = New Size(400, 400)
Me.Text = "Input Control Persistence String"
Me.SuspendLayout()
tbox = New System.Windows.Forms.TextBox()
tbox.Multiline = True
tbox.Size = New Size(Me.Width - 40, Me.Height - 90)
tbox.Text = ""
Me.Controls.Add(tbox)
Dim okButton As New System.Windows.Forms.Button()
okButton.Text = "OK"
okButton.Size = New Size(80, 24)
okButton.Location = New Point(Me.Width - 100, Me.Height - 60)
okButton.Anchor = AnchorStyles.Bottom Or AnchorStyles.Right
okButton.DialogResult = DialogResult.OK
Me.Controls.Add(okButton)
Dim cancelButton As New System.Windows.Forms.Button()
cancelButton.Text = "Cancel"
cancelButton.Size = New Size(80, 24)
cancelButton.Location = New Point(Me.Width - 200, Me.Height - 60)
cancelButton.Anchor = AnchorStyles.Bottom Or AnchorStyles.Right
cancelButton.DialogResult = DialogResult.Cancel
Me.Controls.Add(cancelButton)
Me.ResumeLayout()
End Sub
End Class
End Namespace
Comentários
A classe T:System.Web.UI.Design.ControlParser fornece métodos que podem criar um controle T:System.Web.UI.Control ou interface T:System.Web.UI.ITemplate analisando uma cadeia de caracteres de marcação que representa um modelo de controle ou controle.
Métodos
| Equals(Object) |
Determina se o objeto especificado é igual ao objeto atual. (Herdado de Object) |
| GetHashCode() |
Serve como a função de hash padrão. (Herdado de Object) |
| GetType() |
Obtém o Type da instância atual. (Herdado de Object) |
| MemberwiseClone() |
Cria uma cópia superficial do Object atual. (Herdado de Object) |
| ParseControl(IDesignerHost, String) |
Cria um controle com base na marcação especificada usando o host de designer especificado. |
| ParseControl(IDesignerHost, String, String) |
Cria um controle com base na marcação especificada usando as diretivas e o host de designer especificados. |
| ParseControls(IDesignerHost, String) |
Cria uma matriz de controles com base na marcação especificada usando o host de designer especificado. |
| ParseTemplate(IDesignerHost, String) |
Cria uma interface ITemplate com base na marcação de modelo especificada. |
| ParseTemplate(IDesignerHost, String, String) |
Analisa a marcação de modelo especificada e cria uma interface ITemplate. |
| ToString() |
Retorna uma cadeia de caracteres que representa o objeto atual. (Herdado de Object) |
Aplica-se a
Confira também
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