This documentation is archived and is not being maintained.

SerialPort.ReadTo Method

Reads a string up to the specified value in the input buffer.

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

public string ReadTo(
	string value
)

Parameters

value
Type: System.String
A value that indicates where the read operation stops.

Return Value

Type: System.String
The contents of the input buffer up to the specified value.

ExceptionCondition
ArgumentException

The length of the value parameter is 0.

ArgumentNullException

The value parameter is null.

InvalidOperationException

The specified port is not open.

TimeoutException

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

This method reads a string up to the specified value. While the returned string does not include the value, the value is removed from the input buffer.

If it is necessary to switch between reading text and reading binary data from the stream, select a protocol that carefully defines the boundary between text and binary data, such as manually reading bytes and decoding the data.

NoteNote

Because the SerialPort class buffers data, and the stream contained in the BaseStream property does not, the two might conflict about how many bytes are available to read. The BytesToRead property can indicate that there are bytes to read, but these bytes might not be accessible to the stream contained in the BaseStream property because they have been buffered to the SerialPort class.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
Show: