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BinaryWriter.Write Method (Byte[], Int32, Int32)

 

Writes a region of a byte array to the current stream.

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

public virtual void Write(
	byte[] buffer,
	int index,
	int count
)

Parameters

buffer
Type: System.Byte[]

A byte array containing the data to write.

index
Type: System.Int32

The starting point in buffer at which to begin writing.

count
Type: System.Int32

The number of bytes to write.

Exception Condition
ArgumentException

The buffer length minus index is less than count.

ArgumentNullException

buffer is null.

ArgumentOutOfRangeException

index or count is negative.

IOException

An I/O error occurs.

ObjectDisposedException

The stream is closed.

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

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.

using System;
using System.IO;

namespace BinaryRW
{
    class Program
    {
        static void Main(string[] args)
        {
            const int arrayLength = 1000;
            byte[] dataArray = new byte[arrayLength];
            byte[] verifyArray = new byte[arrayLength];

            new Random().NextBytes(dataArray);

            using (BinaryWriter binWriter = new BinaryWriter(new MemoryStream()))
            {
                Console.WriteLine("Writing the data.");
                binWriter.Write(dataArray, 0, arrayLength);

                using (BinaryReader binReader = new BinaryReader(binWriter.BaseStream))
                {
                    binReader.BaseStream.Position = 0;

                    if (binReader.Read(verifyArray, 0, arrayLength) != 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.");
        }
    }
}

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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