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TextReader.Peek Method

Reads the next character without changing the state of the reader or the character source. Returns the next available character without actually reading it from the input stream.

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

public virtual int Peek()

Return Value

Type: System.Int32
An integer representing the next character to be read, or -1 if no more characters are available or the stream does not support seeking.

ExceptionCondition
ObjectDisposedException

The TextReader is closed.

IOException

An I/O error occurs.

The Peek method returns an integer value in order to determine whether the end of the file, or another error has occurred. This allows a user to first check if the returned value is -1 before casting it to a Char type.

The current position of the TextReader is not changed by this operation. The returned value is -1 if no more characters are available. The default implementation returns -1.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

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.

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