Reads the specified number of bytes from the current stream into a byte array and advances the current position by that number of bytes.
Assemblies: System.IO (in System.IO.dll)
mscorlib (in mscorlib.dll)
- Type: System.Int32
The number of bytes to read. This value must be 0 or a non-negative number or an exception will occur.
Return ValueType: System.Byte
A byte array containing data read from the underlying stream. This might be less than the number of bytes 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.
An I/O error occurs.
The stream is closed.
count is negative.
The following code example shows how to write binary data using memory as a backing store, and then verify that the data was written correctly.
This example reads the contents of a file and displays it to the console as dump text. The end of the file that is being read is detected when the length of the Byte array returned from is zero.
.NET FrameworkSupported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0
.NET Framework Client ProfileSupported in: 4, 3.5 SP1
Portable Class LibrarySupported in: Portable Class Library
.NET for Windows Store appsSupported in: Windows 8
Supported in: Windows Phone 8.1
Supported in: Windows Phone Silverlight 8.1
Supported in: Windows Phone Silverlight 8
Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.