Represents a collection that contains the key field of each record in a data source. This class cannot be inherited.
Assembly: System.Web (in System.Web.dll)
Thetype exposes the following members.
|Count||Gets the number of items in the collection.|
|IsReadOnly||Gets a value indicating whether items in the can be modified.|
|IsSynchronized||Gets a value indicating whether the is synchronized (thread-safe).|
|Item||Gets the key field at the specified index in the collection.|
|SyncRoot||Gets the object used to synchronize access to the .|
|CopyTo||Copies all the items from the to the specified System::Array object, starting at the specified index in the System::Array object.|
|Equals(Object)||Determines whether the specified object is equal to the current object. (Inherited from Object.)|
|GetEnumerator||Creates a System.Collections::IEnumerator implemented object that contains all key fields in the .|
|GetHashCode||Serves as the default hash function. (Inherited from Object.)|
|GetType||Gets the Type of the current instance. (Inherited from Object.)|
|ToString||Returns a string that represents the current object. (Inherited from Object.)|
|AsParallel||Enables parallelization of a query. (Defined by ParallelEnumerable.)|
|AsQueryable||Converts an IEnumerable to an IQueryable. (Defined by Queryable.)|
|Cast<TResult>||Casts the elements of an IEnumerable to the specified type. (Defined by Enumerable.)|
|OfType<TResult>||Filters the elements of an IEnumerable based on a specified type. (Defined by Enumerable.)|
The 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 , use one of following methods:
Use the indexer to get a single key field from the collection, using array notation.
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.