DataReader Class

Artigo
10/02/2013

Provides the ability to expose data from any data.

Inheritance Hierarchy

System.Object
  Microsoft.VisualStudio.Data.DataReader
    Microsoft.VisualStudio.Data.AdoDotNet.AdoDotNetDataReader
    Microsoft.VisualStudio.Data.AdoDotNet.AdoDotNetDataTableReader
    Microsoft.VisualStudio.Data.AdoDotNet.AdoDotNetSchemaReader

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

Syntax

'Declaration
Public MustInherit Class DataReader _
    Implements IDisposable

public abstract class DataReader : IDisposable

public ref class DataReader abstract : IDisposable

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

public abstract class DataReader implements IDisposable

The DataReader type exposes the following members.

Constructors

	Name	Description
	DataReader	Class constructor. Instantiates a nonparameterized instance of the DataReader class.

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Properties

	Name	Description
	IsClosed	Retrieves a Boolean value that indicates whether the specified reader has been closed.
	ItemCount	Retrieves the number of items in the current block of data.
	Status	Retrieves 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 as well as 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	Retrieves a specified number of bytes of raw binary data.
	GetHashCode	Serves as the default hash function. (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.
	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	Retrieves the data type of a data item item, or items, at the specified index in a specified format.
	GetType	Gets the Type of the current instance. (Inherited from Object.)
	IsNullItem	Indicates whether the data item at the specified index 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 in cases where the reader contains multiple results.
	Read	Advances the reader to the next block of data in cases where the reader contains more than one block.
	Terminate	Terminates the data reader immediately, without necessarily returning all of the data nor 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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