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CollectionBase Class

Provides the abstract base class for a strongly typed collection.

Namespace:  System.Collections
Assembly:  mscorlib (in mscorlib.dll)

public abstract class CollectionBase implements IList, ICollection, IEnumerable

A CollectionBase instance is always modifiable. See ReadOnlyCollectionBase for a read-only version of this class.

The capacity of a CollectionBase is the number of elements the CollectionBase can hold. As elements are added to a CollectionBase, the capacity is automatically increased as required through reallocation. The capacity can be decreased by setting the Capacity property explicitly.

Notes to Implementers:

This base class is provided to make it easier for implementers to create a strongly typed custom collection. Implementers are encouraged to extend this base class instead of creating their own.

The following code example implements the CollectionBase class and uses that implementation to create a collection of Int16 objects.

No code example is currently available or this language may not be supported.

System.Object
  System.Collections.CollectionBase
    Microsoft.ManagementConsole.BaseCollection
    System.CodeDom.CodeAttributeArgumentCollection
    System.CodeDom.CodeAttributeDeclarationCollection
    System.CodeDom.CodeCatchClauseCollection
    System.CodeDom.CodeCommentStatementCollection
    System.CodeDom.CodeDirectiveCollection
    System.CodeDom.CodeExpressionCollection
    System.CodeDom.CodeNamespaceCollection
    System.CodeDom.CodeParameterDeclarationExpressionCollection
    System.CodeDom.CodeStatementCollection
    System.CodeDom.CodeTypeDeclarationCollection
    System.CodeDom.CodeTypeMemberCollection
    System.CodeDom.CodeTypeParameterCollection
    System.CodeDom.CodeTypeReferenceCollection
    System.CodeDom.Compiler.CompilerErrorCollection
    System.ComponentModel.Design.Data.DataSourceDescriptorCollection
    System.ComponentModel.Design.Data.DataSourceGroupCollection
    System.ComponentModel.Design.DesignerActionItemCollection
    System.ComponentModel.Design.DesignerActionListCollection
    System.ComponentModel.Design.DesignerVerbCollection
    System.Configuration.Install.InstallerCollection
    System.Data.SqlClient.SqlBulkCopyColumnMappingCollection
    System.Diagnostics.CounterCreationDataCollection
    System.Diagnostics.EventLogPermissionEntryCollection
    System.Diagnostics.PerformanceCounterPermissionEntryCollection
    System.DirectoryServices.ActiveDirectory.ActiveDirectorySchemaClassCollection
    System.DirectoryServices.ActiveDirectory.ActiveDirectorySchemaPropertyCollection
    System.DirectoryServices.ActiveDirectory.ActiveDirectorySiteCollection
    System.DirectoryServices.ActiveDirectory.ActiveDirectorySiteLinkCollection
    System.DirectoryServices.ActiveDirectory.ActiveDirectorySubnetCollection
    System.DirectoryServices.ActiveDirectory.DirectoryServerCollection
    System.DirectoryServices.DirectoryServicesPermissionEntryCollection
    System.DirectoryServices.PropertyValueCollection
    System.DirectoryServices.Protocols.DirectoryAttribute
    System.DirectoryServices.Protocols.DirectoryAttributeCollection
    System.DirectoryServices.Protocols.DirectoryAttributeModificationCollection
    System.DirectoryServices.Protocols.DirectoryControlCollection
    System.Messaging.AccessControlList
    System.Messaging.MessageQueuePermissionEntryCollection
    System.Security.Cryptography.X509Certificates.X509CertificateCollection
    System.ServiceProcess.ServiceControllerPermissionEntryCollection
    System.Web.ParserErrorCollection
    System.Web.Services.Description.BasicProfileViolationCollection
    System.Web.Services.Description.MimePartCollection
    System.Web.Services.Description.MimeTextMatchCollection
    System.Web.Services.Description.ServiceDescriptionBaseCollection
    System.Web.Services.Description.WebReferenceCollection
    System.Web.Services.Discovery.DiscoveryClientResultCollection
    System.Web.Services.Discovery.DiscoveryReferenceCollection
    System.Web.Services.Protocols.SoapHeaderCollection
    System.Web.UI.WebControls.EmbeddedMailObjectsCollection
    System.Web.UI.WebControls.RoleGroupCollection
    System.Web.UI.WebControls.WebParts.ProxyWebPartConnectionCollection
    System.Web.UI.WebControls.WebParts.WebPartConnectionCollection
    System.Web.UI.WebControls.WebParts.WebPartDisplayModeCollection
    System.Web.UI.WebControls.WebParts.WebPartTransformerCollection
    System.Windows.Documents.LinkTargetCollection
    System.Windows.Forms.Design.Behavior.BehaviorServiceAdornerCollection
    System.Windows.Forms.Design.Behavior.GlyphCollection
    System.Xml.Schema.XmlSchemaObjectCollection
    System.Xml.Serialization.Advanced.SchemaImporterExtensionCollection
    System.Xml.Serialization.XmlAnyElementAttributes
    System.Xml.Serialization.XmlArrayItemAttributes
    System.Xml.Serialization.XmlElementAttributes
    System.Xml.Serialization.XmlSchemas

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

This implementation does not provide a synchronized (thread safe) wrapper for a CollectionBase, but derived classes can create their own synchronized versions of the CollectionBase using the SyncRoot property.

Enumerating through a collection is intrinsically not a thread safe procedure. Even when a collection is synchronized, other threads can still modify the collection, which causes the enumerator to throw an exception. To guarantee thread safety during enumeration, you can either lock the collection during the entire enumeration or catch the exceptions resulting from changes made by other threads.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Framework

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0
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