DataKeyCollection Class

Represents a collection that contains the key field of each record in a data source. This class cannot be inherited.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (in system.web.dll)

public ref class DataKeyCollection sealed : ICollection, IEnumerable
public final class DataKeyCollection implements ICollection, IEnumerable
public final class DataKeyCollection implements ICollection, IEnumerable
Not applicable.

The DataKeyCollection class represents a collection of the key fields in the data source. The key field of each record in the data source is stored in this collection. This allows you to store the key field with a data listing control without displaying it in the control. This collection is automatically filled with the values from the field specified by the BaseDataList.DataKeyField property. This collection does not allow you to manually add or remove items from the collection.

The key field is commonly used in a handler for an event, such as ItemCommand or DeleteCommand, as part of an update query string to revise a specific record in the data source. The key field helps the update query string identify the appropriate record to modify.

Use the Count property to determine the number of items in the collection. To programmatically retrieve a key field from a DataKeyCollection, use one of following methods:

  • Use the indexer to get a single key field from the collection, using array notation.

  • Use the CopyTo method to copy the contents of the collection to a System.Array object, which can then be used to get items from the collection.

  • Use the GetEnumerator method to create a System.Collections.IEnumerator implemented object, which can then be used to get items from the collection.

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

  • AspNetHostingPermission  for operating in a hosted environment. Demand value: LinkDemand; Permission value: Minimal.

System.Object
  System.Web.UI.WebControls.DataKeyCollection

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

Windows 98, Windows Server 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

Community Additions

ADD
Show: