WriteByte Method

Stream.WriteByte Method (Byte)


Writes a byte to the current position in the stream and advances the position within the stream by one byte.

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

public virtual void WriteByte(
	byte value


Type: System.Byte

The byte to write to the stream.

Exception Condition

An I/O error occurs.


The stream does not support writing, or the stream is already closed.


Methods were called after the stream was closed.

Use the CanWrite property to determine whether the current instance supports writing.

Notes to Implementers:

The default implementation on Stream creates a new single-byte array and then calls Write. While this is formally correct, it is inefficient. Any stream with an internal buffer should override this method and provide a much more efficient version that writes to the buffer directly, avoiding the extra array allocation on every call.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Return to top
© 2015 Microsoft