Assembly: System.Data (in system.data.dll)
The IDataReader and IDataRecord interfaces allow an inheriting class to implement a DataReader class, which provides a means of reading one or more forward-only streams of result sets. For more information about DataReader classes, see Retrieving Data Using a DataReader. For more information about implementing .NET Framework data providers, see Implementing a .NET Framework Data Provider.
An application does not create an instance of the IDataReader interface directly, but creates an instance of a class that inherits IDataReader.
Classes that inherit IDataReader must implement the inherited members, and typically define additional members to add provider-specific functionality.
Changes made to a resultset by another process or thread while data is being read may be visible to the user of a class that implements an IDataReader. However, the precise behavior is both provider and timing dependent.Notes to Implementers To promote consistency among .NET Framework data providers, name the inheriting class in the form Prv Command where Prv is the uniform prefix given to all classes in a specific .NET Framework data provider namespace. For example, Sql is the prefix of the SqlDataAdapter class in the System.Data.SqlClient namespace. Users do not create an instance of a DataReader class directly. Instead, they obtain the DataReader through the ExecuteReader method of the Command object. Therefore, you should mark DataReader constructors as internal.
The following example creates instances of the derived classes, SqlConnection, SqlCommand, and SqlDataReader. The example reads through the data, writing it out to the console. Finally, the example closes the SqlDataReader, then the SqlConnection.
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.