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BinaryWriter.Write Method (Byte[])

Writes a byte array to the underlying stream.

Namespace: System.IO
Assembly: mscorlib (in mscorlib.dll)

'Declaration
Public Overridable Sub Write ( _
	buffer As Byte() _
)
'Usage
Dim instance As BinaryWriter
Dim buffer As Byte()

instance.Write(buffer)
public void Write (
	byte[] buffer
)
public function Write (
	buffer : byte[]
)

Parameters

buffer

A byte array containing the data to write.

Exception typeCondition

IOException

An I/O error occurs.

ObjectDisposedException

The stream is closed.

ArgumentNullException

buffer is a null reference (Nothing in Visual Basic).

The following table lists examples of other typical or related I/O tasks.

To do this...

See the example in this topic...

Create a text file.

How to: Write Text to a File

Write to a text file.

How to: Write Text to a File

Read from a text file.

How to: Read Text from a File

Append text to a file.

How to: Open and Append to a Log File

File.AppendText

FileInfo.AppendText

Get the size of a file.

FileInfo.Length

Get the attributes of a file.

File.GetAttributes

Set the attributes of a file.

File.SetAttributes

Determine if a file exists.

File.Exists

Read from a binary file.

How to: Read and Write to a Newly Created Data File

Write to a binary file.

How to: Read and Write to a Newly Created Data File

The following code example shows how to write binary data using memory as a backing store, and then verify that the data was written correctly.

Imports System
Imports System.IO

Public Class BinaryRW

    Shared Sub Main()
    
        Const upperBound As Integer = 1000

        ' Create random data to write to the stream.
        Dim dataArray(upperBound) As Byte
        Dim randomGenerator As New Random
        randomGenerator.NextBytes(dataArray)

        Dim binWriter As New BinaryWriter(New MemoryStream())

        ' Write the data to the stream.
        Console.WriteLine("Writing the data.")
        binWriter.Write(dataArray)

        ' Create the reader using the stream from the writer.
        Dim binReader As New BinaryReader(binWriter.BaseStream)

        ' Set the stream position to the beginning of the stream.
        binReader.BaseStream.Position = 0

        ' Read and verify the data.
        Dim verifyArray() As Byte = _
            binReader.ReadBytes(dataArray.Length)
        If verifyArray.Length <> dataArray.Length Then
            Console.WriteLine("Error writing the data.")
            Return
        End If
        For i As Integer = 0 To upperBound
            If verifyArray(i) <> dataArray(i) Then
                Console.WriteLine("Error writing the data.")
                Return
            End If
        Next i
        Console.WriteLine("The data was written and verified.")
    
    End Sub
End Class

import System.*;
import System.IO.*;

class BinaryRW
{   
    public static void main(String[] args)
    {
        final int arrayLength = 1000;

        // Create random data to write to the stream.
        ubyte dataArray[] = new ubyte[arrayLength];
        new Random().NextBytes(dataArray);

        BinaryWriter binWriter = new BinaryWriter(new MemoryStream());

        // Write the data to the stream.
        Console.WriteLine("Writing the data.");
        binWriter.Write(dataArray);

        // Create the reader using the stream from the writer.
        BinaryReader binReader = new BinaryReader(binWriter.get_BaseStream());

        // Set Position to the beginning of the stream.
        binReader.get_BaseStream().set_Position(0);

        // Read and verify the data.
        ubyte verifyArray[] = binReader.ReadBytes(arrayLength);
        if ( verifyArray.length != arrayLength ) {
            Console.WriteLine("Error writing the data.");
            return;
        }
        for(int i=0;i < arrayLength;i++) {
            if ( verifyArray[i] != dataArray[i] ) {
                Console.WriteLine("Error writing the data.");
                return;
            }
        } 
        Console.WriteLine("The data was written and verified.");
    } //main
} //BinaryRW

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

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