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

Writes a specified number of bytes to the serial port using data from a buffer.

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

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

Parameters

buffer
Type: System.Byte[]

The byte array that contains the data to write to the port.

offset
Type: System.Int32

The zero-based byte offset in the buffer parameter at which to begin copying bytes to the port.

count
Type: System.Int32

The number of bytes to write.

ExceptionCondition
ArgumentNullException

The buffer passed is null.

InvalidOperationException

The specified port is not open.

ArgumentOutOfRangeException

The offset or count parameters are outside a valid region of the buffer being passed. Either offset or count is less than zero.

ArgumentException

offset plus count is greater than the length of the buffer.

TimeoutException

The operation did not complete before the time-out period ended.

Use this method when you want to write to a byte buffer to create output to a serial port.

If there are too many bytes in the output buffer and Handshake is set to XOnXOff then the SerialPort object may raise a TimeoutException while it waits for the device to be ready to accept more data.

By default, SerialPort uses ASCIIEncoding to encode the characters. ASCIIEncoding encodes all characters greater then 127 as (char)63 or '?'. To support additional characters in that range, set Encoding to UTF8Encoding, UTF32Encoding, or UnicodeEncoding.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

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

.NET Framework

Supported in: 3.5, 3.0, 2.0

.NET Compact Framework

Supported in: 3.5, 2.0

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