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SerialPort.BytesToRead Property

Gets the number of bytes of data in the receive buffer.

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

[BrowsableAttribute(false)]
public int BytesToRead { get; }

Property Value

Type: System.Int32
The number of bytes of data in the receive buffer.

ExceptionCondition
IOException

The port is in an invalid state.

InvalidOperationException

The stream is closed. This can occur because the Open method has not been called or the Close method has been called.

The receive buffer includes the serial driver's receive buffer as well as internal buffering in the SerialPort object itself.

NoteNote:

The BytesToRead property can return a value larger than the ReadBufferSize property because the ReadBufferSize property represents only the Windows-created buffer while the BytesToRead property represents the SerialPort buffer in addition to the Windows-created buffer.

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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