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BinaryReader.PeekChar Method

Returns the next available character and does not advance the byte or character position.

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

public virtual int PeekChar ()
public int PeekChar ()
public function PeekChar () : int

Return Value

The next available character, or -1 if no more characters are available or the stream does not support seeking.
Exception typeCondition

IOException

An I/O error occurs.

If surrogate characters can be expected in the stream use the ReadChars method, then set the stream back to the original position.

The following table lists examples of other typical or related I/O tasks.

To do this...

See the example in this topic...

Create a text file.

How to: Write Text to a File

Write to a text file.

How to: Write Text to a File

Read from a text file.

How to: Read Text from a File

Read from a binary file.

How to: Read and Write to a Newly Created Data File

Write to a binary file.

How to: Read and Write to a Newly Created Data File

This code example is part of a larger example provided for the BinaryReader class.

BinaryReader binReader = 
    new BinaryReader(File.Open(fileName, FileMode.Open));
try
{
    // If the file is not empty, 
    // read the application settings.
    if(binReader.PeekChar() != -1)
    {
        aspectRatio   = binReader.ReadSingle();
        lookupDir     = binReader.ReadString();
        autoSaveTime  = binReader.ReadInt32();
        showStatusBar = binReader.ReadBoolean();
    }
}

// If the end of the stream is reached before reading
// the four data values, ignore the error and use the
// default settings for the remaining values.
catch(EndOfStreamException e)
{
    Console.WriteLine("{0} caught and ignored. " + 
        "Using default values.", e.GetType().Name);
}
finally
{
    binReader.Close();
}

BinaryReader binReader =
    new BinaryReader(File.Open(fileName, FileMode.Open));
try {
    // If the file is not empty, 
    // read the application settings.
    if ( binReader.PeekChar() !=-1  ) {
        aspectRatio = binReader.ReadSingle();
        lookupDir = binReader.ReadString();
        autoSaveTime = binReader.ReadInt32();
        showStatusBar = binReader.ReadBoolean();
    }
}

// If the end of the stream is reached before reading
// the four data values, ignore the error and use the
// default settings for the remaining values.
catch(EndOfStreamException e) {
    Console.WriteLine("{0} caught and ignored. "
        + "Using default values.", e.GetType().get_Name());
}
finally {
    binReader.Close();
}

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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