Reads the specified number of characters from the current stream, returns the data in a character array, and advances the current position in accordance with the Encoding used and the specific character being read from the stream.
Assembly: mscorlib (in mscorlib.dll)
'Declaration Public Overridable Function ReadChars ( _ count As Integer _ ) As Char()
- Type: System.Int32
The number of characters to read.
Return ValueType: System.Char()
A character array containing data read from the underlying stream. This might be less than the number of characters requested if the end of the stream is reached.
The number of decoded characters to read is greater than count. This can happen if a Unicode decoder returns fallback characters or a surrogate pair.
The stream is closed.
An I/O error occurs.
count is negative.
BinaryReader does not restore the file position after an unsuccessful read operation.
When reading from network streams, in some rare cases, the method might read an extra character from the stream if the BinaryReader was constructed with Unicode encoding. If this occurs, you can use the ReadBytes method to read a fixed-length byte array, and then pass that array to the method.
The following code example shows how to read and write data using memory as a backing store.
Imports System Imports System.IO Public Class BinaryRW Shared Sub Main() Dim invalidPathChars() As Char = Path.InvalidPathChars Dim memStream As new MemoryStream() Dim binWriter As New BinaryWriter(memStream) ' Write to memory. binWriter.Write("Invalid file path characters are: ") binWriter.Write(Path.InvalidPathChars) ' Create the reader using the same MemoryStream ' as used with the writer. Dim binReader As New BinaryReader(memStream) ' Set Position to the beginning of the stream. memStream.Position = 0 ' Read the data from memory and write it to the console. Console.Write(binReader.ReadString()) Console.WriteLine(binReader.ReadChars( _ CInt(memStream.Length - memStream.Position))) End Sub End Class
.NET FrameworkSupported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
.NET Framework Client ProfileSupported in: 4, 3.5 SP1
XNA FrameworkSupported in: 3.0, 2.0, 1.0
Portable Class LibrarySupported in: Portable Class Library
Supported in: Windows Phone 8.1
Supported in: Windows Phone Silverlight 8.1
Supported in: Windows Phone Silverlight 8