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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 = L"FullTrust")]
public ref class CategoryNameCollection sealed : public 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(array<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.

#using <System.Windows.Forms.dll>
#using <System.Data.dll>
#using <System.Drawing.dll>
#using <System.dll>

using namespace System;
using namespace System::Collections;
using namespace System::ComponentModel;
using namespace System::ComponentModel::Design;
using namespace System::Drawing;
using namespace System::Drawing::Design;
using namespace System::Data;
using namespace System::Windows::Forms;

namespace ToolboxCategoryNamesControl
   public ref class ToolboxCategoryNamesControl: public System::Windows::Forms::UserControl
      System::Drawing::Design::IToolboxService^ toolboxService;
      System::Drawing::Design::CategoryNameCollection^ categoryNames;

         this->BackColor = System::Drawing::Color::Beige;
         this->Name = "Category Names Display Control";
         this->Size = System::Drawing::Size( 264, 200 );

      property System::ComponentModel::ISite^ Site 
         // Obtain or reset IToolboxService^ reference on each siting of control. 
         virtual System::ComponentModel::ISite^ get() override
            return __super::Site;

         virtual void set( System::ComponentModel::ISite^ value ) override
            __super::Site = value;

            // If the component was sited, attempt to obtain 
            // an IToolboxService^ instance. 
            if ( __super::Site != nullptr )
               toolboxService = dynamic_cast<IToolboxService^>(this->GetService( IToolboxService::typeid ));

               // If an IToolboxService* was located, update the category list. 
               if ( toolboxService != nullptr )
                              categoryNames = toolboxService->CategoryNames;
                        toolboxService = nullptr;

      [System::Security::Permissions::PermissionSetAttribute(System::Security::Permissions::SecurityAction::Demand, Name="FullTrust")]
      virtual void OnPaint( System::Windows::Forms::PaintEventArgs^ e ) override
         if ( categoryNames != nullptr )
            e->Graphics->DrawString( "IToolboxService category names list:", gcnew System::Drawing::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. 
            for ( int i = 0; i < categoryNames->Count; i++ )
               e->Graphics->DrawString( categoryNames[ i ], gcnew System::Drawing::Font( "Arial",8 ), Brushes::Black, (float)10, (float)24 + (10 * i) );

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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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