DataReader Class

Artículo
02/28/2011

Provides the ability to expose data from any data source.

Inheritance Hierarchy

System.Object
  Microsoft.VisualStudio.Data.Framework.DataReader
    Microsoft.VisualStudio.Data.Framework.AdoDotNet.AdoDotNetReader
    Microsoft.VisualStudio.Data.Framework.AdoDotNet.AdoDotNetSchemaReader
    Microsoft.VisualStudio.Data.Framework.AdoDotNet.AdoDotNetTableReader

Namespace: Microsoft.VisualStudio.Data.Framework
Assembly: Microsoft.VisualStudio.Data.Framework (in Microsoft.VisualStudio.Data.Framework.dll)

Syntax

'Declaración
Public MustInherit Class DataReader _
    Implements IVsDataReader, IDisposable, IVsDataReaderDescriptor

public abstract class DataReader : IVsDataReader, 
    IDisposable, IVsDataReaderDescriptor

public ref class DataReader abstract : IVsDataReader, 
    IDisposable, IVsDataReaderDescriptor

[<AbstractClass>]
type DataReader =  
    class
        interface IVsDataReader
        interface IDisposable
        interface IVsDataReaderDescriptor
    end

public abstract class DataReader implements IVsDataReader, IDisposable, IVsDataReaderDescriptor

The DataReader type exposes the following members.

Constructors

	Name	Description
	DataReader	Initializes a new instance of the DataReader class.

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Properties

	Name	Description
	Descriptor	Gets information that describes the data from a data source.
	HasDescriptor	Gets a value indicating whether the data reader exposes its IVsDataReaderDescriptor implementation through the Descriptor property.
	IsClosed	Gets a Boolean value that indicates whether the specified reader has been closed.
	ItemCount	Gets the number of items in the current block of data.
	Status	Gets a numerical status code returned by the method currently providing data to the data reader.

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Methods

	Name	Description
	Close	Closes the DataReader instance.
	Dispose()	Releases managed resources held for the current DataReader instance.
	Dispose(Boolean)	Cleans up resources associated with the current DataReader instance, both when the public Dispose method is called and when the object is finalized with a call to the Finalize method.
	Equals	Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
	Finalize	Finalizes the current DataReader instance. (Overrides Object.Finalize().)
	GetBytes(Int32, array<Byte[], Int32, Int32)	Retrieves a specified number of bytes of raw binary data.
	GetBytes(String, array<Byte[], Int32, Int32)	Retrieves a specified number of bytes of raw binary data.
	GetHashCode	Serves as a hash function for a particular type. (Inherited from Object.)
	GetItem(Int32)	Retrieves the value of the item at the specified index in the current block of data.
	GetItem(String)	Retrieves the value of a data item with the specified name in the current block of data.
	GetItemIndex	Returns the index corresponding to the specified item name in the block of data.
	GetItemMaxLength	Retrieves the maximum length, in characters, of data items at the specified index.
	GetItemName	Retrieves the name assigned to the data item at the specified index, if any.
	GetItemType(Int32)	Retrieves the data type of a data item, or items, at the specified index for the default format Default.
	GetItemType(Int32, DataItemTypeFormat)	Retrieves the data type of a data item, or items, at the specified index in a specified format.
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	IsNullItem(Int32)	Indicates whether the data item at the specified index is unspecified, that is, nulla null reference (Nothing in Visual Basic).
	IsNullItem(String)	Indicates whether the value of the given data item is unspecified, that is, nulla null reference (Nothing in Visual Basic).
	MemberwiseClone	Creates a shallow copy of the current Object. (Inherited from Object.)
	NextResult	Advances the data reader to the next result set in cases where the reader contains multiple result sets.
	Read	Advances the reader to the next block of data in cases where the reader contains more than one block of data.
	Terminate	Terminates the data reader immediately, without necessarily returning all of the data or setting output parameters.
	ToString	Returns a string that represents the current object. (Inherited from Object.)

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Remarks

All base-level data retrieval mechanisms return a DataReader object.

Thread Safety

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

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