BinaryWriter.Write Method (Byte[]) (System.IO)

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BinaryWriter.Write Method (Byte[])
Writes a byte array to the underlying stream.

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

Syntax
Visual Basic (Declaration)
Public Overridable Sub Write ( _
	buffer As Byte() _
)
Visual Basic (Usage)
Dim instance As BinaryWriter
Dim buffer As Byte()

instance.Write(buffer)
C#
public virtual void Write (
	byte[] buffer
)
C++
public:
virtual void Write (
	array<unsigned char>^ buffer
)
J#
public void Write (
	byte[] buffer
)
JScript
public function Write (
	buffer : byte[]
)
XAML
Not applicable.

Parameters

buffer

A byte array containing the data to write.

Exceptions
Exception type Condition

IOException

An I/O error occurs.

ObjectDisposedException

The stream is closed.

ArgumentNullException

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

Remarks

For a list of common I/O tasks, see Common I/O Tasks.

Example

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.

Visual Basic
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
C#
using System;
using System.IO;

class BinaryRW
{
    static void Main()
    {
        const int arrayLength = 1000;

        // Create random data to write to the stream.
        byte[] dataArray = new byte[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.BaseStream);

        // Set Position to the beginning of the stream.
        binReader.BaseStream.Position = 0;

        // Read and verify the data.
        byte[] 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.");
    }
}
C++
using namespace System;
using namespace System::IO;
int main()
{
   const int arrayLength = 1000;
   
   // Create random data to write to the stream.
   array<Byte>^dataArray = gcnew array<Byte>(arrayLength);
   (gcnew Random)->NextBytes( dataArray );
   BinaryWriter^ binWriter = gcnew BinaryWriter( gcnew 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 = gcnew BinaryReader( binWriter->BaseStream );
   
   // Set the stream position to the beginning of the stream.
   binReader->BaseStream->Position = 0;
   
   // Read and verify the data.
   array<Byte>^verifyArray = binReader->ReadBytes( arrayLength );
   if ( verifyArray->Length != arrayLength )
   {
      Console::WriteLine( "Error writing the data." );
      return  -1;
   }

   for ( int i = 0; i < arrayLength; i++ )
   {
      if ( verifyArray[ i ] != dataArray[ i ] )
      {
         Console::WriteLine( "Error writing the data." );
         return  -1;
      }

   }
   Console::WriteLine( "The data was written and verified." );
}
J#
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
Platforms

Windows 98, Windows Server 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

Version Information

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0
See Also