IDataReader-Schnittstelle

Syntax

'Declaration
Public Interface IDataReader _
    Inherits IDisposable
'Usage
Dim instance As IDataReader

public interface IDataReader : IDisposable

public interface class IDataReader : IDisposable

type IDataReader =  
    interface
        interface IDisposable
    end

public interface IDataReader extends IDisposable

Eigenschaften

	Name	Beschreibung
	FieldCount	Gets the number of fields in the data reader.

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Methoden

	Name	Beschreibung
	Dispose	(Geerbt von IDisposable.)
	GetFieldType	Gets the Type information corresponding to the type of object that is returned from GetValue.
	GetName	Gets the name of the field to find.
	GetOrdinal	Return the index of the named field.
	GetValue	Return the value of the specified field.
	Read	Advances the IDataReader to the next record.

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Hinweise

The IDataReader interface enables you 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 Implementieren einer DataReader-Klasse für Datenverarbeitungserweiterungen.

An application does not create an instance of the IDataReader interface directly, but creates an instance of a class that implements IDataReader.

Classes that implement IDataReader must also implement the required members, and typically define additional members to add provider-specific functionality.

Changes made to a result set 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.

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.

Siehe auch

Verweis