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)
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."); } } }
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
