FileStream::ReadByte Method ()
.NET Framework (current version)
Reads a byte from the file and advances the read position one byte.
Assembly: mscorlib (in mscorlib.dll)
| Exception | Condition |
|---|---|
| NotSupportedException | The current stream does not support reading. |
| ObjectDisposedException | The current stream is closed. |
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.
For a list of common file and directory operations, see Common I-O Tasks.
The following code example shows how to write data to a file, byte by byte, and then verify that the data was written correctly.
using namespace System; using namespace System::IO; int main() { String^ fileName = "Test@##@.dat"; // Create random data to write to the file. array<Byte>^dataArray = gcnew array<Byte>(100000); (gcnew Random)->NextBytes( dataArray ); FileStream^ fileStream = gcnew FileStream( fileName,FileMode::Create ); try { // Write the data to the file, byte by byte. for ( int i = 0; i < dataArray->Length; i++ ) { fileStream->WriteByte( dataArray[ i ] ); } // Set the stream position to the beginning of the file. fileStream->Seek( 0, SeekOrigin::Begin ); // Read and verify the data. for ( int i = 0; i < fileStream->Length; i++ ) { if ( dataArray[ i ] != fileStream->ReadByte() ) { Console::WriteLine( "Error writing data." ); return -1; } } Console::WriteLine( "The data was written to {0} " "and verified.", fileStream->Name ); } finally { fileStream->Close(); } }
Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Available since 10
.NET Framework
Available since 1.1
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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