ToolboxItem 类
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
提供工具箱项的基实现。
public ref class ToolboxItem : System::Runtime::Serialization::ISerializable[System.Serializable]
public class ToolboxItem : System.Runtime.Serialization.ISerializablepublic class ToolboxItem : System.Runtime.Serialization.ISerializable[<System.Serializable>]
type ToolboxItem = class
interface ISerializabletype ToolboxItem = class
interface ISerializablePublic Class ToolboxItem
Implements ISerializable- 继承
-
ToolboxItem
- 派生
- 属性
- 实现
示例
下面的代码示例提供了一个组件，该组件使用 IToolboxService 接口将文本数据格式处理程序或 ToolboxItemCreatorCallback添加到工具箱。 数据创建者回调委托会将粘贴到工具箱并拖动到窗体上的任何文本数据传递给创建TextBox包含文本的自定义ToolboxItem。
#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>
#using <System.dll>
using namespace System;
using namespace System::ComponentModel;
using namespace System::ComponentModel::Design;
using namespace System::Drawing;
using namespace System::Drawing::Design;
using namespace System::Windows::Forms;
using namespace System::Security::Permissions;
namespace TextDataTextBoxComponent
{
// Custom toolbox item creates a TextBox and sets its Text property
// to the constructor-specified text.
[PermissionSetAttribute(SecurityAction::Demand, Name="FullTrust")]
public ref class TextToolboxItem: public ToolboxItem
{
private:
String^ text;
delegate void SetTextMethodHandler( Control^ c, String^ text );
public:
TextToolboxItem( String^ text )
: ToolboxItem()
{
this->text = text;
}
protected:
// ToolboxItem::CreateComponentsCore to create the TextBox
// and link a method to set its Text property.
virtual array<IComponent^>^ CreateComponentsCore( IDesignerHost^ host ) override
{
TextBox^ textbox = dynamic_cast<TextBox^>(host->CreateComponent( TextBox::typeid ));
// Because the designer resets the text of the textbox, use
// a SetTextMethodHandler to set the text to the value of
// the text data.
Control^ c = dynamic_cast<Control^>(host->RootComponent);
array<Object^>^temp0 = {textbox,text};
c->BeginInvoke( gcnew SetTextMethodHandler( this, &TextToolboxItem::OnSetText ), temp0 );
array<IComponent^>^temp1 = {textbox};
return temp1;
}
private:
// Method to set the text property of a TextBox after it is initialized.
void OnSetText( Control^ c, String^ text )
{
c->Text = text;
}
};
// Component that adds a "Text" data format ToolboxItemCreatorCallback
// to the Toolbox. This component uses a custom ToolboxItem that
// creates a TextBox containing the text data.
public ref class TextDataTextBoxComponent: public Component
{
private:
bool creatorAdded;
IToolboxService^ ts;
public:
TextDataTextBoxComponent()
{
creatorAdded = false;
}
property System::ComponentModel::ISite^ Site
{
// ISite to register TextBox creator
virtual System::ComponentModel::ISite^ get() override
{
return __super::Site;
}
virtual void set( System::ComponentModel::ISite^ value ) override
{
if ( value != nullptr )
{
__super::Site = value;
if ( !creatorAdded )
AddTextTextBoxCreator();
}
else
{
if ( creatorAdded )
RemoveTextTextBoxCreator();
__super::Site = value;
}
}
}
private:
// Adds a "Text" data format creator to the toolbox that creates
// a textbox from a text fragment pasted to the toolbox.
void AddTextTextBoxCreator()
{
ts = dynamic_cast<IToolboxService^>(GetService( IToolboxService::typeid ));
if ( ts != nullptr )
{
ToolboxItemCreatorCallback^ textCreator =
gcnew ToolboxItemCreatorCallback(
this,
&TextDataTextBoxComponent::CreateTextBoxForText );
try
{
ts->AddCreator(
textCreator,
"Text",
dynamic_cast<IDesignerHost^>(GetService( IDesignerHost::typeid )) );
creatorAdded = true;
}
catch ( Exception^ ex )
{
MessageBox::Show( ex->ToString(), "Exception Information" );
}
}
}
// Removes any "Text" data format creator from the toolbox.
void RemoveTextTextBoxCreator()
{
if ( ts != nullptr )
{
ts->RemoveCreator(
"Text",
dynamic_cast<IDesignerHost^>(GetService( IDesignerHost::typeid )) );
creatorAdded = false;
}
}
// ToolboxItemCreatorCallback delegate format method to create
// the toolbox item.
ToolboxItem^ CreateTextBoxForText( Object^ serializedObject, String^ format )
{
IDataObject^ o = gcnew DataObject(dynamic_cast<IDataObject^>(serializedObject));
if( o->GetDataPresent("System::String", true) )
{
String^ toolboxText = dynamic_cast<String^>(o->GetData( "System::String", true ));
return( gcnew TextToolboxItem( toolboxText ));
}
return nullptr;
}
public:
~TextDataTextBoxComponent()
{
if ( creatorAdded )
RemoveTextTextBoxCreator();
}
};
}
using System;
using System.ComponentModel;
using System.ComponentModel.Design;
using System.Drawing;
using System.Drawing.Design;
using System.Security.Permissions;
using System.Windows.Forms;
namespace TextDataTextBoxComponent
{
// Component that adds a "Text" data format ToolboxItemCreatorCallback
// to the Toolbox. This component uses a custom ToolboxItem that
// creates a TextBox containing the text data.
public class TextDataTextBoxComponent : Component
{
private bool creatorAdded = false;
private IToolboxService ts;
public TextDataTextBoxComponent()
{
}
// ISite override to register TextBox creator
public override System.ComponentModel.ISite Site
{
get
{
return base.Site;
}
set
{
if( value != null )
{
base.Site = value;
if (!creatorAdded)
{
AddTextTextBoxCreator();
}
}
else
{
if (creatorAdded)
{
RemoveTextTextBoxCreator();
}
base.Site = value;
}
}
}
// Adds a "Text" data format creator to the toolbox that creates
// a textbox from a text fragment pasted to the toolbox.
private void AddTextTextBoxCreator()
{
ts = (IToolboxService)GetService(typeof(IToolboxService));
if (ts != null)
{
ToolboxItemCreatorCallback textCreator =
new ToolboxItemCreatorCallback(this.CreateTextBoxForText);
try
{
ts.AddCreator(
textCreator,
"Text",
(IDesignerHost)GetService(typeof(IDesignerHost)));
creatorAdded = true;
}
catch(Exception ex)
{
MessageBox.Show(
ex.ToString(),
"Exception Information");
}
}
}
// Removes any "Text" data format creator from the toolbox.
private void RemoveTextTextBoxCreator()
{
if (ts != null)
{
ts.RemoveCreator(
"Text",
(IDesignerHost)GetService(typeof(IDesignerHost)));
creatorAdded = false;
}
}
// ToolboxItemCreatorCallback delegate format method to create
// the toolbox item.
private ToolboxItem CreateTextBoxForText(
object serializedObject,
string format)
{
DataObject o = new DataObject((IDataObject)serializedObject);
string[] formats = o.GetFormats();
if (o.GetDataPresent("System.String", true))
{
string toolboxText = (string)(o.GetData("System.String", true));
return (new TextToolboxItem(toolboxText));
}
return null;
}
protected override void Dispose(bool disposing)
{
if (creatorAdded)
{
RemoveTextTextBoxCreator();
}
}
}
// Custom toolbox item creates a TextBox and sets its Text property
// to the constructor-specified text.
public class TextToolboxItem : ToolboxItem
{
private string text;
private delegate void SetTextMethodHandler(Control c, string text);
public TextToolboxItem(string text) : base()
{
this.text = text;
}
// ToolboxItem.CreateComponentsCore override to create the TextBox
// and link a method to set its Text property.
protected override IComponent[] CreateComponentsCore(IDesignerHost host)
{
System.Windows.Forms.TextBox textbox =
(TextBox)host.CreateComponent(typeof(TextBox));
// Because the designer resets the text of the textbox, use
// a SetTextMethodHandler to set the text to the value of
// the text data.
Control c = host.RootComponent as Control;
c.BeginInvoke(
new SetTextMethodHandler(OnSetText),
new object[] {textbox, text});
return new System.ComponentModel.IComponent[] { textbox };
}
// Method to set the text property of a TextBox after it is initialized.
private void OnSetText(Control c, string text)
{
c.Text = text;
}
}
}
Imports System.ComponentModel
Imports System.ComponentModel.Design
Imports System.Drawing
Imports System.Drawing.Design
Imports System.Security.Permissions
Imports System.Windows.Forms
' Component that adds a "Text" data format ToolboxItemCreatorCallback
' to the Toolbox. This component uses a custom ToolboxItem that
' creates a TextBox containing the text data.
<PermissionSetAttribute(SecurityAction.Demand, Name:="FullTrust")> _
Public Class TextDataTextBoxComponent
Inherits System.ComponentModel.Component
Private creatorAdded As Boolean = False
Private ts As IToolboxService
Public Sub New()
End Sub
' ISite override to register TextBox creator
Public Overrides Property Site() As System.ComponentModel.ISite
Get
Return MyBase.Site
End Get
Set(ByVal Value As System.ComponentModel.ISite)
If (Value IsNot Nothing) Then
MyBase.Site = Value
If Not creatorAdded Then
AddTextTextBoxCreator()
End If
Else
If creatorAdded Then
RemoveTextTextBoxCreator()
End If
MyBase.Site = Value
End If
End Set
End Property
' Adds a "Text" data format creator to the toolbox that creates
' a textbox from a text fragment pasted to the toolbox.
Private Sub AddTextTextBoxCreator()
ts = CType(GetService(GetType(IToolboxService)), IToolboxService)
If (ts IsNot Nothing) Then
Dim textCreator As _
New ToolboxItemCreatorCallback(AddressOf Me.CreateTextBoxForText)
Try
ts.AddCreator( _
textCreator, _
"Text", _
CType(GetService(GetType(IDesignerHost)), IDesignerHost))
creatorAdded = True
Catch ex As Exception
MessageBox.Show(ex.ToString(), "Exception Information")
End Try
End If
End Sub
' Removes any "Text" data format creator from the toolbox.
Private Sub RemoveTextTextBoxCreator()
If (ts IsNot Nothing) Then
ts.RemoveCreator( _
"Text", _
CType(GetService(GetType(IDesignerHost)), IDesignerHost))
creatorAdded = False
End If
End Sub
' ToolboxItemCreatorCallback delegate format method to create
' the toolbox item.
Private Function CreateTextBoxForText( _
ByVal serializedObject As Object, _
ByVal format As String) As ToolboxItem
Dim o As New DataObject(CType(serializedObject, IDataObject))
Dim formats As String() = o.GetFormats()
If o.GetDataPresent("System.String", True) Then
Return New TextToolboxItem(CStr(o.GetData("System.String", True)))
End If
Return Nothing
End Function
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If creatorAdded Then
RemoveTextTextBoxCreator()
End If
End Sub
End Class
' Custom toolbox item creates a TextBox and sets its Text property
' to the constructor-specified text.
<PermissionSetAttribute(SecurityAction.Demand, Name:="FullTrust")> _
Public Class TextToolboxItem
Inherits System.Drawing.Design.ToolboxItem
Private [text] As String
Delegate Sub SetTextMethodHandler( _
ByVal c As Control, _
ByVal [text] As String)
Public Sub New(ByVal [text] As String)
Me.text = [text]
End Sub
' ToolboxItem.CreateComponentsCore override to create the TextBox
' and link a method to set its Text property.
<PermissionSetAttribute(SecurityAction.Demand, Name:="FullTrust")> _
Protected Overrides Function CreateComponentsCore(ByVal host As IDesignerHost) As IComponent()
Dim textbox As TextBox = CType(host.CreateComponent(GetType(TextBox)), TextBox)
' Because the designer resets the text of the textbox, use
' a SetTextMethodHandler to set the text to the value of
' the text data.
Dim c As Control = host.RootComponent
c.BeginInvoke( _
New SetTextMethodHandler(AddressOf OnSetText), _
New Object() {textbox, [text]})
Return New System.ComponentModel.IComponent() {textbox}
End Function
' Method to set the text property of a TextBox after it is initialized.
Private Sub OnSetText(ByVal c As Control, ByVal [text] As String)
c.Text = [text]
End Sub
End Class
下面的代码示例演示如何将 ToolboxItem 类用作自定义工具箱项实现的基类。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Design;
using System.Data;
using System.Runtime.Serialization;
using System.Text;
using System.Windows.Forms;
namespace CustomToolboxItem
{
public class Form1 : Form
{
private System.ComponentModel.IContainer components = null;
private UserControl1 userControl11;
private System.Windows.Forms.Label label1;
public Form1()
{
InitializeComponent();
}
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.userControl11 = new CustomToolboxItem.UserControl1();
this.SuspendLayout();
//
// label1
//
this.label1.Location = new System.Drawing.Point(15, 16);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(265, 62);
this.label1.TabIndex = 0;
this.label1.Text = "Build the project and drop UserControl1 from the toolbox onto the form.";
//
// userControl11
//
this.userControl11.LabelText = "This is a custom user control. The text you see here is provided by a custom too" +
"lbox item when the user control is dropped on the form.";
this.userControl11.Location = new System.Drawing.Point(74, 81);
this.userControl11.Name = "userControl11";
this.userControl11.Padding = new System.Windows.Forms.Padding(6);
this.userControl11.Size = new System.Drawing.Size(150, 150);
this.userControl11.TabIndex = 1;
//
// Form1
//
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.userControl11);
this.Controls.Add(this.label1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
static void Main()
{
Application.EnableVisualStyles();
Application.Run(new Form1());
}
}
// Configure this user control to have a custom toolbox item.
[ToolboxItem(typeof(MyToolboxItem))]
public class UserControl1 : UserControl
{
private System.ComponentModel.IContainer components = null;
private System.Windows.Forms.Label label1;
public UserControl1()
{
InitializeComponent();
}
public string LabelText
{
get
{
return label1.Text;
}
set
{
label1.Text = value;
}
}
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// label1
//
this.label1.Dock = System.Windows.Forms.DockStyle.Fill;
this.label1.Location = new System.Drawing.Point(6, 6);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(138, 138);
this.label1.TabIndex = 0;
this.label1.Text = "This is a custom user control. " +
"The text you see here is provided by a custom toolbox" +
" item when the user control is dropped on the form.\r\n";
this.label1.TextAlign =
System.Drawing.ContentAlignment.MiddleCenter;
//
// UserControl1
//
this.Controls.Add(this.label1);
this.Name = "UserControl1";
this.Padding = new System.Windows.Forms.Padding(6);
this.ResumeLayout(false);
}
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
}
// Toolbox items must be serializable.
[Serializable]
class MyToolboxItem : ToolboxItem
{
// The add components dialog in Visual Studio looks for a public
// constructor that takes a type.
public MyToolboxItem(Type toolType)
: base(toolType)
{
}
// And you must provide this special constructor for serialization.
// If you add additional data to MyToolboxItem that you
// want to serialize, you may override Deserialize and
// Serialize methods to add that data.
MyToolboxItem(SerializationInfo info, StreamingContext context)
{
Deserialize(info, context);
}
// Let's override the creation code and pop up a dialog.
protected override IComponent[] CreateComponentsCore(
System.ComponentModel.Design.IDesignerHost host,
System.Collections.IDictionary defaultValues)
{
// Get the string we want to fill in the custom
// user control. If the user cancels out of the dialog,
// return null or an empty array to signify that the
// tool creation was canceled.
using (ToolboxItemDialog d = new ToolboxItemDialog())
{
if (d.ShowDialog() == DialogResult.OK)
{
string text = d.CreationText;
IComponent[] comps =
base.CreateComponentsCore(host, defaultValues);
// comps will have a single component: our data type.
((UserControl1)comps[0]).LabelText = text;
return comps;
}
else
{
return null;
}
}
}
}
public class ToolboxItemDialog : Form
{
private System.ComponentModel.IContainer components = null;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
public ToolboxItemDialog()
{
InitializeComponent();
}
private void InitializeComponent()
{
this.label1 = new System.Windows.Forms.Label();
this.textBox1 = new System.Windows.Forms.TextBox();
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// label1
//
this.label1.Location = new System.Drawing.Point(10, 9);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(273, 43);
this.label1.TabIndex = 0;
this.label1.Text = "Enter the text you would like" +
" to have the user control populated with:";
//
// textBox1
//
this.textBox1.AutoSize = false;
this.textBox1.Location = new System.Drawing.Point(10, 58);
this.textBox1.Multiline = true;
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(270, 67);
this.textBox1.TabIndex = 1;
this.textBox1.Text = "This is a custom user control. " +
"The text you see here is provided by a custom toolbox" +
" item when the user control is dropped on the form.";
//
// button1
//
this.button1.DialogResult = System.Windows.Forms.DialogResult.OK;
this.button1.Location = new System.Drawing.Point(124, 131);
this.button1.Name = "button1";
this.button1.TabIndex = 2;
this.button1.Text = "OK";
//
// button2
//
this.button2.DialogResult = System.Windows.Forms.DialogResult.Cancel;
this.button2.Location = new System.Drawing.Point(205, 131);
this.button2.Name = "button2";
this.button2.TabIndex = 3;
this.button2.Text = "Cancel";
//
// ToolboxItemDialog
//
this.AcceptButton = this.button1;
this.CancelButton = this.button2;
this.ClientSize = new System.Drawing.Size(292, 162);
this.ControlBox = false;
this.Controls.Add(this.button2);
this.Controls.Add(this.button1);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.label1);
this.FormBorderStyle =
System.Windows.Forms.FormBorderStyle.FixedDialog;
this.Name = "ToolboxItemDialog";
this.Text = "ToolboxItemDialog";
this.ResumeLayout(false);
}
public string CreationText
{
get
{
return textBox1.Text;
}
}
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
}
}
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.Drawing
Imports System.Drawing.Design
Imports System.Runtime.Serialization
Imports System.Text
Imports System.Windows.Forms
Public Class Form1
Inherits Form
Private components As System.ComponentModel.IContainer = Nothing
Friend WithEvents UserControl11 As UserControl1
Friend WithEvents label1 As System.Windows.Forms.Label
Public Sub New()
InitializeComponent()
End Sub
Private Sub InitializeComponent()
Me.label1 = New System.Windows.Forms.Label
Me.UserControl11 = New UserControl1
Me.SuspendLayout()
'
'label1
'
Me.label1.Location = New System.Drawing.Point(15, 16)
Me.label1.Name = "label1"
Me.label1.Size = New System.Drawing.Size(265, 62)
Me.label1.TabIndex = 0
Me.label1.Text = "Build the project and drop UserControl1" + _
" from the toolbox onto the form."
'
'UserControl11
'
Me.UserControl11.LabelText = "This is a custom user control. " + _
"The text you see here is provided by a custom too" + _
"lbox item when the user control is dropped on the form."
Me.UserControl11.Location = New System.Drawing.Point(74, 85)
Me.UserControl11.Name = "UserControl11"
Me.UserControl11.Padding = New System.Windows.Forms.Padding(6)
Me.UserControl11.TabIndex = 1
'
'Form1
'
Me.ClientSize = New System.Drawing.Size(292, 266)
Me.Controls.Add(Me.UserControl11)
Me.Controls.Add(Me.label1)
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso (components IsNot Nothing) Then
components.Dispose()
End If
MyBase.Dispose(disposing)
End Sub
Shared Sub Main()
Application.EnableVisualStyles()
Application.Run(New Form1())
End Sub
End Class
' Configure this user control to have a custom toolbox item.
<ToolboxItem(GetType(MyToolboxItem))> _
Public Class UserControl1
Inherits UserControl
Private components As System.ComponentModel.IContainer = Nothing
Private label1 As System.Windows.Forms.Label
Public Sub New()
InitializeComponent()
End Sub
Public Property LabelText() As String
Get
Return label1.Text
End Get
Set(ByVal value As String)
label1.Text = Value
End Set
End Property
Private Sub InitializeComponent()
Me.label1 = New System.Windows.Forms.Label()
Me.SuspendLayout()
'
' label1
'
Me.label1.Dock = System.Windows.Forms.DockStyle.Fill
Me.label1.Location = New System.Drawing.Point(6, 6)
Me.label1.Name = "label1"
Me.label1.Size = New System.Drawing.Size(138, 138)
Me.label1.TabIndex = 0
Me.label1.Text = "This is a custom user control. " + _
"The text you see here is provided by a custom toolbox" + _
" item when the user control is dropped on the form." + _
vbCr + vbLf
Me.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter
'
' UserControl1
'
Me.Controls.Add(label1)
Me.Name = "UserControl1"
Me.Padding = New System.Windows.Forms.Padding(6)
Me.ResumeLayout(False)
End Sub
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso (components IsNot Nothing) Then
components.Dispose()
End If
MyBase.Dispose(disposing)
End Sub
End Class
' Toolbox items must be serializable.
<Serializable()> _
Class MyToolboxItem
Inherits ToolboxItem
' The add components dialog in Visual Studio looks for a public
' constructor that takes a type.
Public Sub New(ByVal toolType As Type)
MyBase.New(toolType)
End Sub
' And you must provide this special constructor for serialization.
' If you add additional data to MyToolboxItem that you
' want to serialize, you may override Deserialize and
' Serialize methods to add that data.
Sub New(ByVal info As SerializationInfo, _
ByVal context As StreamingContext)
Deserialize(info, context)
End Sub
' Let's override the creation code and pop up a dialog.
Protected Overrides Function CreateComponentsCore( _
ByVal host As System.ComponentModel.Design.IDesignerHost, _
ByVal defaultValues As System.Collections.IDictionary) _
As IComponent()
' Get the string we want to fill in the custom
' user control. If the user cancels out of the dialog,
' return null or an empty array to signify that the
' tool creation was canceled.
Using d As New ToolboxItemDialog()
If d.ShowDialog() = DialogResult.OK Then
Dim [text] As String = d.CreationText
Dim comps As IComponent() = _
MyBase.CreateComponentsCore(host, defaultValues)
' comps will have a single component: our data type.
CType(comps(0), UserControl1).LabelText = [text]
Return comps
Else
Return Nothing
End If
End Using
End Function
End Class
Public Class ToolboxItemDialog
Inherits Form
Private components As System.ComponentModel.IContainer = Nothing
Private label1 As System.Windows.Forms.Label
Private textBox1 As System.Windows.Forms.TextBox
Private button1 As System.Windows.Forms.Button
Private button2 As System.Windows.Forms.Button
Public Sub New()
InitializeComponent()
End Sub
Private Sub InitializeComponent()
Me.label1 = New System.Windows.Forms.Label()
Me.textBox1 = New System.Windows.Forms.TextBox()
Me.button1 = New System.Windows.Forms.Button()
Me.button2 = New System.Windows.Forms.Button()
Me.SuspendLayout()
'
' label1
'
Me.label1.Location = New System.Drawing.Point(10, 9)
Me.label1.Name = "label1"
Me.label1.Size = New System.Drawing.Size(273, 43)
Me.label1.TabIndex = 0
Me.label1.Text = "Enter the text you would like" + _
" to have the user control populated with:"
'
' textBox1
'
Me.textBox1.AutoSize = False
Me.textBox1.Location = New System.Drawing.Point(10, 58)
Me.textBox1.Multiline = True
Me.textBox1.Name = "textBox1"
Me.textBox1.Size = New System.Drawing.Size(270, 67)
Me.textBox1.TabIndex = 1
Me.textBox1.Text = "This is a custom user control. " + _
"The text you see here is provided by a custom toolbox" + _
" item when the user control is dropped on the form."
'
' button1
'
Me.button1.DialogResult = System.Windows.Forms.DialogResult.OK
Me.button1.Location = New System.Drawing.Point(124, 131)
Me.button1.Name = "button1"
Me.button1.TabIndex = 2
Me.button1.Text = "OK"
'
' button2
'
Me.button2.DialogResult = System.Windows.Forms.DialogResult.Cancel
Me.button2.Location = New System.Drawing.Point(205, 131)
Me.button2.Name = "button2"
Me.button2.TabIndex = 3
Me.button2.Text = "Cancel"
'
' ToolboxItemDialog
'
Me.AcceptButton = Me.button1
Me.CancelButton = Me.button2
Me.ClientSize = New System.Drawing.Size(292, 162)
Me.ControlBox = False
Me.Controls.Add(button2)
Me.Controls.Add(button1)
Me.Controls.Add(textBox1)
Me.Controls.Add(label1)
Me.FormBorderStyle = _
System.Windows.Forms.FormBorderStyle.FixedDialog
Me.Name = "ToolboxItemDialog"
Me.Text = "ToolboxItemDialog"
Me.ResumeLayout(False)
End Sub
Public ReadOnly Property CreationText() As String
Get
Return textBox1.Text
End Get
End Property
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso (components IsNot Nothing) Then
components.Dispose()
End If
MyBase.Dispose(disposing)
End Sub
End Class
注解
ToolboxItem 是可在设计时环境的工具箱中显示的工具箱项的基类。 工具箱项通常表示在设计模式文档上调用时要创建的组件。 类 ToolboxItem 提供为工具箱提供工具箱项的显示属性、使用时创建一个或多个组件以及序列化和反序列化自身以在工具箱数据库中持久性所需的方法和属性。
可以使用要创建的名称、位图和类型配置 类的 ToolboxItem 实例，而无需创建派生自 ToolboxItem的类。 类 ToolboxItem 还提供自定义工具箱项实现的基类。 自定义 ToolboxItem 可以创建多个组件。 若要实现自定义工具箱项，必须派生自 ToolboxItem 并重写 CreateComponentsCore、 Serialize和 Deserialize 方法。
必须配置以下属性和方法才能使 正常运行 ToolboxItem ：
属性 DisplayName 指定工具箱项在工具箱中显示的标签。
属性 TypeName 指定项创建的组件的类型的完全限定名称。 如果派生类创建多个组件， TypeName 则属性可能会使用，也可能不使用，具体取决于方法重写是否 CreateComponentsCore 取决于此属性的值。
属性 AssemblyName 指定程序集，该程序集包含项创建的组件的类型。
属性 Bitmap （可选）指定要在工具箱中工具箱项的显示名称旁边显示的位图图像。
属性 Filter （可选）包含任何 ToolboxItemFilterAttribute 对象，这些对象确定是否可以在特定组件上使用工具箱项。
方法 CreateComponentsCore 返回一个或多个组件实例，以插入使用此工具的位置。
方法 Serialize 将工具箱项保存到指定的 SerializationInfo。
方法 Deserialize 根据指定的 SerializationInfo中包含的状态信息配置工具箱项。
如果CreateComponentsCore方法尚未重写为不同的行为，则Initialize该方法将工具箱项配置为创建指定类型的组件。
属性 Locked 指示是否可以更改工具箱项的属性。 工具箱项通常在添加到工具箱后被锁定。
方法 Lock 锁定工具箱项。
如果 Locked 属性为
true，则 CheckUnlocked 方法将引发异常。
构造函数
| ToolboxItem() |
初始化 ToolboxItem 类的新实例。 |
| ToolboxItem(Type) |
初始化 ToolboxItem 类的新实例，它将创建组件的指定类型。 |
属性
| AssemblyName |
获取或者设置程序集的名称，该程序集中包含工具箱项创建的一个或多个类型。 |
| Bitmap |
获取或设置表示工具箱中的工具箱项的位图。 |
| Company |
获取或设置此 ToolboxItem 的公司名称。 |
| ComponentType |
获取此 ToolboxItem 的组件类型。 |
| DependentAssemblies |
获取或设置工具箱项的 AssemblyName。 |
| Description |
获取或设置此 ToolboxItem 的说明。 |
| DisplayName |
获取或设置此工具箱项的显示名称。 |
| Filter |
获取或设置确定工具箱项是否可以用于目标组件的筛选器。 |
| IsTransient |
获取一个值，该值指示工具箱项是否为临时工具箱项。 |
| Locked |
获取一个值，该值指示 ToolboxItem 当前是否处于锁定状态。 |
| OriginalBitmap |
获取或设置将在工具箱中用于此项的原始位图。 |
| Properties |
获取属性的字典。 |
| TypeName |
获取或设置 IComponent 类型的完全限定名，调用工具箱项将由工具箱创建该名称。 |
| Version |
获取此 ToolboxItem 的版本。 |
方法
事件
| ComponentsCreated |
组件创建后立即发生。 |
| ComponentsCreating |
即将创建组件时发生。 |
显式接口实现
| ISerializable.GetObjectData(SerializationInfo, StreamingContext) |
有关此成员的说明，请参见 GetObjectData(SerializationInfo, StreamingContext) 方法。 |
适用于
另请参阅
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