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CategoryNameCollection Class

Represents a collection of category name strings.


Namespace:  System.Drawing.Design
Assembly:  System.Drawing (in System.Drawing.dll)

<PermissionSetAttribute(SecurityAction.LinkDemand, Name := "FullTrust")> _
Public NotInheritable Class CategoryNameCollection _
	Inherits ReadOnlyCollectionBase

The CategoryNameCollection type exposes the following members.

Public methodCategoryNameCollection(CategoryNameCollection)Initializes a new instance of the CategoryNameCollection class using the specified collection.
Public methodCategoryNameCollection(String())Initializes a new instance of the CategoryNameCollection class using the specified array of names.

Public propertyCountGets the number of elements contained in the ReadOnlyCollectionBase instance. (Inherited from ReadOnlyCollectionBase.)
Public propertyItemGets the category name at the specified index.

Public methodContainsIndicates whether the specified category is contained in the collection.
Public methodCopyToCopies the collection elements to the specified array at the specified index.
Public methodEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Public methodGetEnumeratorReturns an enumerator that iterates through the ReadOnlyCollectionBase instance. (Inherited from ReadOnlyCollectionBase.)
Public methodGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodIndexOfGets the index of the specified value.
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)

Explicit interface implemetationPrivate methodICollection.CopyToCopies the entire ReadOnlyCollectionBase to a compatible one-dimensional Array, starting at the specified index of the target array. (Inherited from ReadOnlyCollectionBase.)
Explicit interface implemetationPrivate propertyICollection.IsSynchronizedGets a value indicating whether access to a ReadOnlyCollectionBase object is synchronized (thread safe). (Inherited from ReadOnlyCollectionBase.)
Explicit interface implemetationPrivate propertyICollection.SyncRootGets an object that can be used to synchronize access to a ReadOnlyCollectionBase object. (Inherited from ReadOnlyCollectionBase.)

This collection is used to store collections of toolbox category names.

The following code example attempts to retrieve the IToolboxService when the control is sited in design mode. If the IToolboxService is retrieved, the code gets the names of each toolbox category and draws each name on the surface of the control.

Imports System
Imports System.Collections
Imports System.ComponentModel
Imports System.ComponentModel.Design
Imports System.Drawing
Imports System.Drawing.Design
Imports System.Data
Imports System.Windows.Forms

<System.Security.Permissions.PermissionSetAttribute(System.Security.Permissions.SecurityAction.Demand, Name:="FullTrust")> _
Public Class ToolboxCategoryNamesControl
    Inherits System.Windows.Forms.UserControl
    Private toolboxService As System.Drawing.Design.IToolboxService
    Private categoryNames As System.Drawing.Design.CategoryNameCollection

    Public Sub New()
        Me.BackColor = System.Drawing.Color.Beige
        Me.Name = "Category Names Display Control" 
        Me.Size = New System.Drawing.Size(264, 200)
    End Sub 

    ' Obtain or reset IToolboxService reference on each siting of control. 
    Public Overrides Property Site() As System.ComponentModel.ISite
            Return MyBase.Site
        End Get 
        Set(ByVal Value As System.ComponentModel.ISite)
            MyBase.Site = Value

            ' If the component was sited, attempt to obtain  
            ' an IToolboxService instance. 
            If (MyBase.Site IsNot Nothing) Then
                toolboxService = CType(Me.GetService(GetType(IToolboxService)), IToolboxService)
                ' If an IToolboxService was located, update the category list. 
                If (toolboxService IsNot Nothing) Then
                    categoryNames = toolboxService.CategoryNames
                End If 
                toolboxService = Nothing 
            End If 
        End Set 
    End Property 

    Protected Overrides Sub OnPaint(ByVal e As System.Windows.Forms.PaintEventArgs)
        If (categoryNames IsNot Nothing) Then
            e.Graphics.DrawString("IToolboxService category names list:", New Font("Arial", 9), Brushes.Black, 10, 10)

            ' categoryNames is a CategoryNameCollection obtained from  
            ' the IToolboxService. CategoryNameCollection is a read-only  
            ' string collection.                                 
            ' Output each category name in the CategoryNameCollection.                                                 
            Dim i As Integer 
            For i = 0 To categoryNames.Count - 1
                e.Graphics.DrawString(categoryNames(i), New Font("Arial", 8), Brushes.Black, 10, 24 + 10 * i)
            Next i
        End If 
    End Sub 

End Class

.NET Framework

Supported in: 4.5.3, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
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