System.Data Namespace

---

Provides access to the column values within each row for a DataReader, and is implemented by .NET data providers that access relational databases.

IDataRecord Interface Members

Show Inherited Members

Properties Visibility Name Value Type Accessibility public FieldCount Int32 [ Get ] public Item ( String name ) Object [ Get ] public Item ( Int32 i ) Object [ Get ]   Methods Visibility Name Parameters Return Type public GetBoolean ( Int32 i ) Boolean public GetByte ( Int32 i ) Byte public GetBytes ( Int32 i , Int64 fieldOffset , Byte buffer , Int32 bufferoffset , Int32 length ) Int64 public GetChar ( Int32 i ) Char public GetChars ( Int32 i , Int64 fieldoffset , Char buffer , Int32 bufferoffset , Int32 length ) Int64 public GetData ( Int32 i ) IDataReader public GetDataTypeName ( Int32 i ) String public GetDateTime ( Int32 i ) DateTime public GetDecimal ( Int32 i ) Decimal public GetDouble ( Int32 i ) Double public GetFieldType ( Int32 i ) Type public GetFloat ( Int32 i ) Single public GetGuid ( Int32 i ) Guid public GetInt16 ( Int32 i ) Int16 public GetInt32 ( Int32 i ) Int32 public GetInt64 ( Int32 i ) Int64 public GetName ( Int32 i ) String public GetOrdinal ( String name ) Int32 public GetString ( Int32 i ) String public GetValue ( Int32 i ) Object public GetValues ( Object values ) Int32 public IsDBNull ( Int32 i ) Boolean

Class	Description
OleDbDataReader	Provides a way of reading a forward-only stream of data rows from a data source.
SqlDataReader	Provides a means of reading a forward-only stream of rows from an SQL Server™ database.

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 the ADO.NET DataReader. For more information about implementing .NET data providers, see Implementing a .NET Data Provider.

An application does not create an instance of the IDataRecord interface directly, but initializes an instance of a class that inherits IDataRecord. Typically this is done by obtaining a DataReader through ExecuteReader method of the Command object.

Classes that inherit IDataRecord must implement the inherited members, and typically define additional members to add provider-specific functionality.

Providers implementing a DataReader are required to expose data in common language runtime ( CLR ) types. Type coercion is defined for some types not included in the CLR. These values may be accessed as alternate types, which conform to CLR types. As an example, the following table lists suggested mappings from OLE DB data types to CLR types, and lists alternate types in parentheses in the CLR Type column.

OLE DB Type	CLR Type
DBTYPE_BOOL	Int16
DBTYPE_BSTR	string
DBTYPE_BYTES	byte [ ]
DBTYPE_CY	Decimal
DBTYPE_DATE	DateTime
DBTYPE_DBDATE	DateTime
DBTYPE_DBTIME	DateTime
DBTYPE_DBTIMESTAMP	DateTime
DBTYPE_DECIMAL	Decimal
DBTYPE_EMPTY	null
DBTYPE_ERROR	ExternalException
DBTYPE_FILETIME	DateTime
DBTYPE_GUID	Guid
DBTYPE_HCHAPTER	not supported
DBTYPE_I1	SByte
DBTYPE_I2	Int16
DBTYPE_I4	Int32
DBTYPE_I8	Int64
DBTYPE_IDISPATCH	object
DBTYPE_IUNKNOWN	object
DBTYPE_NULL	DBNull.Value
DBTYPE_NUMERIC	Decimal
DBTYPE_PROPVARIANT	object
DBTYPE_R4	Single
DBTYPE_R8	Double
DBTYPE_STR	string
DBTYPE_UDT	not supported
DBTYPE_UI1	byte ( Int16 )
DBTYPE_UI2	UInt16 ( Int32 )
DBTYPE_UI4	UInt32 ( Int64 )
DBTYPE_UI8	UInt64 ( Decimal )
DBTYPE_VARIANT	object
DBTYPE_VARNUMERIC	not supported
DBTYPE_WSTR	string

The following examples demonstrate using the IDataRecord interface to render the data items of a templated control that are bound to the column values within each row of a DataReader.

Binding a DataReader to a Repeater Run Sample | View Source

Binding a DataReader to a DataList Run Sample | View Source

Binding a DataReader to a DataGrid Run Sample | View Source

IDataReader   OleDbDataReader   SqlDataReader

Suggested Reading