AdoDotNetReader.GetBytes Method (Int32, [], Int32, Int32)

Retrieves a specified number of bytes of binary data.

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

Syntax

'宣言
Public Overrides Function GetBytes ( _
    index As Integer, _
    buffer As Byte(), _
    bufferIndex As Integer, _
    length As Integer _
) As Integer
'使用
Dim instance As AdoDotNetReader
Dim index As Integer
Dim buffer As Byte()
Dim bufferIndex As Integer
Dim length As Integer
Dim returnValue As Integer

returnValue = instance.GetBytes(index, _
    buffer, bufferIndex, length)

public override int GetBytes(
    int index,
    byte[] buffer,
    int bufferIndex,
    int length
)

public:
virtual int GetBytes(
    int index, 
    array<unsigned char>^ buffer, 
    int bufferIndex, 
    int length
) override

public override function GetBytes(
    index : int, 
    buffer : byte[], 
    bufferIndex : int, 
    length : int
) : int

Parameters

index
Type: System.Int32

Index in the current block of data for the item to retrieve.

buffer
Type: []

An array into which specified data, as byte array, should be placed. If a null reference (Nothing in Visual Basic), this method returns the size required of the array in order to fit all of the specified data.

bufferIndex
Type: System.Int32

Index of the starting point in the byte array specified by the buffer parameter.

length
Type: System.Int32

The number of bytes to be read into the byte array specified by the buffer parameter.

Return Value

Type: System.Int32

A numerical value indicating the number of bytes read into the buffer.

Implements

IVsDataReader.GetBytes(Int32, [], Int32, Int32)

Remarks

When data is presented by the data provider in the form of bytes, this method can be called to read only a certain number of the bytes into an existing client-side buffer. This performs better than simply retrieving the whole value, which causes all the data to be read and allocated in memory.

Permissions

Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.