ToolboxItem Класс

Определение

public ref class ToolboxItem : System::Runtime::Serialization::ISerializable

[System.Serializable]
public class ToolboxItem : System.Runtime.Serialization.ISerializable

public class ToolboxItem : System.Runtime.Serialization.ISerializable

[<System.Serializable>]
type ToolboxItem = class
    interface ISerializable

type ToolboxItem = class
    interface ISerializable

Public Class ToolboxItem
Implements ISerializable

Наследование

Object

ToolboxItem

Производный

System.Web.UI.Design.WebControlToolboxItem

System.Workflow.ComponentModel.Design.ActivityToolboxItem

Атрибуты

SerializableAttribute

Реализации

ISerializable

Примеры

В следующем примере кода представлен компонент, использующий IToolboxService интерфейс для добавления обработчика форматирования текстовых данных или ToolboxItemCreatorCallbackв панель элементов. Делегат обратного вызова создателя данных передает все текстовые данные, вставленные на панель элементов, и перетаскивается в форму в пользовательскую ToolboxItem , которая создает TextBox содержащий текст.

#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

В следующем примере кода демонстрируется использование ToolboxItem класса в качестве базового класса для реализации пользовательского элемента панели элементов.

using System;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Design;
using System.Runtime.Serialization;
using System.Windows.Forms;

namespace CustomToolboxItem;

public class Form1 : Form
{
    readonly IContainer _components;
    UserControl1 userControl11;
    Label label1;

    public Form1() => InitializeComponent();

    void InitializeComponent()
    {
        label1 = new Label();
        userControl11 = new UserControl1();
        SuspendLayout();
        // 
        // label1
        // 
        label1.Location = new Point(15, 16);
        label1.Name = "label1";
        label1.Size = new Size(265, 62);
        label1.TabIndex = 0;
        label1.Text = "Build the project and drop UserControl1 from the toolbox onto the form.";
        // 
        // userControl11
        // 
        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.";
        userControl11.Location = new Point(74, 81);
        userControl11.Name = "userControl11";
        userControl11.Padding = new Padding(6);
        userControl11.Size = new Size(150, 150);
        userControl11.TabIndex = 1;
        // 
        // Form1
        // 
        ClientSize = new Size(292, 266);
        Controls.Add(userControl11);
        Controls.Add(label1);
        Name = "Form1";
        Text = "Form1";
        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
{
    readonly IContainer _components;
    Label label1;

    public UserControl1() => InitializeComponent();

    public string LabelText
    {
        get => label1.Text; set => label1.Text = value;
    }

    void InitializeComponent()
    {
        label1 = new Label();
        SuspendLayout();
        // 
        // label1
        // 
        label1.Dock = DockStyle.Fill;
        label1.Location = new Point(6, 6);
        label1.Name = "label1";
        label1.Size = new Size(138, 138);
        label1.TabIndex = 0;
        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";
        label1.TextAlign =
            ContentAlignment.MiddleCenter;
        // 
        // UserControl1
        // 
        Controls.Add(label1);
        Name = "UserControl1";
        Padding = new Padding(6);
        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())
        {
            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
{
    readonly IContainer _components;
    Label label1;
    TextBox textBox1;
    Button button1;
    Button button2;

    public ToolboxItemDialog() => InitializeComponent();

    void InitializeComponent()
    {
        label1 = new Label();
        textBox1 = new TextBox();
        button1 = new Button();
        button2 = new Button();
        SuspendLayout();
        // 
        // label1
        // 
        label1.Location = new Point(10, 9);
        label1.Name = "label1";
        label1.Size = new Size(273, 43);
        label1.TabIndex = 0;
        label1.Text = "Enter the text you would like" +
            " to have the user control populated with:";
        // 
        // textBox1
        // 
        textBox1.AutoSize = false;
        textBox1.Location = new Point(10, 58);
        textBox1.Multiline = true;
        textBox1.Name = "textBox1";
        textBox1.Size = new Size(270, 67);
        textBox1.TabIndex = 1;
        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
        // 
        button1.DialogResult = DialogResult.OK;
        button1.Location = new Point(124, 131);
        button1.Name = "button1";
        button1.TabIndex = 2;
        button1.Text = "OK";
        // 
        // button2
        // 
        button2.DialogResult = DialogResult.Cancel;
        button2.Location = new Point(205, 131);
        button2.Name = "button2";
        button2.TabIndex = 3;
        button2.Text = "Cancel";
        // 
        // ToolboxItemDialog
        // 
        AcceptButton = button1;
        CancelButton = button2;
        ClientSize = new Size(292, 162);
        ControlBox = false;
        Controls.Add(button2);
        Controls.Add(button1);
        Controls.Add(textBox1);
        Controls.Add(label1);
        FormBorderStyle =
            FormBorderStyle.FixedDialog;
        Name = "ToolboxItemDialog";
        Text = "ToolboxItemDialog";
        ResumeLayout(false);
    }

    public string CreationText => 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

Комментарии

ToolboxItem — базовый класс для элементов панели элементов, которые можно отобразить на панели элементов среды разработки. Элемент панели элементов обычно представляет компонент для создания при вызове в документе режима конструктора. Класс ToolboxItem предоставляет методы и свойства, необходимые для предоставления панели элементов свойств отображения для элемента панели элементов, для создания компонента или компонентов при использовании, а также для сериализации и десериализации себя для сохранения в базе данных панели элементов.

Экземпляр ToolboxItem класса можно настроить с именем, растровым изображением и типом для создания, не создавая класс, производный от ToolboxItem. Этот ToolboxItem класс также предоставляет базовый класс для реализации пользовательских элементов панели элементов. Пользователь ToolboxItem может создавать несколько компонентов. Чтобы реализовать пользовательский элемент панели элементов, необходимо наследовать и ToolboxItem переопределить CreateComponentsCoreметоды и Deserialize методыSerialize.

Для правильной ToolboxItem работы необходимо настроить следующие свойства и методы:

• Свойство DisplayName задает метку элемента панели элементов при отображении на панели элементов.

• Свойство TypeName задает полное имя типа создаваемого элемента. Если производный класс создает несколько компонентов, TypeName свойство может использоваться или не может использоваться, зависит ли CreateComponentsCore переопределение метода от значения этого свойства.

• Свойство AssemblyName указывает сборку, содержащую тип создаваемого элемента.

• При необходимости свойство Bitmap указывает растровое изображение, отображаемое рядом с отображаемого имени элемента панели элементов на панели элементов.

• При необходимости свойство Filter содержит все ToolboxItemFilterAttribute объекты, определяющие, можно ли использовать элемент панели элементов для определенного компонента.

• Метод CreateComponentsCore возвращает экземпляр компонента или экземпляры для вставки, где используется это средство.

• Метод Serialize сохраняет элемент панели элементов в указанный SerializationInfo.

• Метод Deserialize настраивает элемент панели элементов из сведений о состоянии, содержащихся в указанном SerializationInfo.

• Метод Initialize настраивает элемент панели элементов для создания указанного типа компонента, если CreateComponentsCore метод не переопределен для поведения по-другому.

• Свойство Locked указывает, можно ли изменить свойства элемента панели элементов. Элемент панели элементов обычно заблокирован после его добавления на панель элементов.

• Метод Lock блокирует элемент панели элементов.

• Метод CheckUnlocked создает исключение, если Locked свойство имеет значение true.

См. также раздел

• ToolboxItemFilterAttribute
• ToolboxItemAttribute
• IToolboxService
• IToolboxUser
• ToolboxComponentsCreatedEventArgs
• ToolboxComponentsCreatedEventHandler