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Stream.ReadByte Method

Reads a byte from the stream and advances the position within the stream by one byte, or returns -1 if at the end of the stream.

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

public virtual int ReadByte ()
public int ReadByte ()
public function ReadByte () : int

Return Value

The unsigned byte cast to an Int32, or -1 if at the end of the stream.

Exception typeCondition

NotSupportedException

The stream does not support reading.

ObjectDisposedException

Methods were called after the stream was closed.

For an example of creating a file and writing text to a file, see How to: Write Text to a File. For an example of reading text from a file, see How to: Read Text from a File. For an example of reading from and writing to a binary file, see How to: Read and Write to a Newly Created Data File.

Use the CanRead property to determine whether the current instance supports reading.

Attempts to manipulate the stream after the stream has been closed could throw an ObjectDisposedException.

Notes to Implementers The default implementation on Stream creates a new single-byte array and then calls Read. 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 reads the buffer directly, avoiding the extra array allocation on every call.

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

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

.NET Framework

Supported in: 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0
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