Class SeekBufferStream
Decorator that adds seek buffering to another System.IO.Stream.
public sealed class SeekBufferStream : DelegatingStream- Inheritance
-
objectMarshalByRefObjectStreamSeekBufferStream
- Inherited Members
- Extension Methods
Constructors
SeekBufferStream(Stream, int)
Decorator that adds seek buffering to another System.IO.Stream.
public SeekBufferStream(Stream underlyingStream, int bufferSize = 262144)Parameters
underlyingStreamStreamUnderlying stream to delegate to. Will be disposed together with this stream.
bufferSizeintThe maximum number of bytes to buffer for seeking backwards. Set this to 0 to allow forward but no backward seeking.
Fields
DefaultBufferSize
The default for the maximum number of bytes to buffer for seeking backwards.
public const int DefaultBufferSize = 262144Field Value
- int
Properties
CanSeek
When overridden in a derived class, gets a value indicating whether the current stream supports seeking.
public override bool CanSeek { get; }Property Value
- bool
true if the stream supports seeking; otherwise, false.
Position
When overridden in a derived class, gets or sets the position within the current stream.
public override long Position { get; set; }Property Value
- long
The current position within the stream.
Exceptions
- IOException
An I/O error occurs.
- NotSupportedException
The stream does not support seeking.
- ObjectDisposedException
Methods were called after the stream was closed.
Methods
Dispose(bool)
Releases the unmanaged resources used by the System.IO.Stream and optionally releases the managed resources.
protected override void Dispose(bool disposing)Parameters
disposingbooltrue to release both managed and unmanaged resources; false to release only unmanaged resources.
Read(byte[], int, int)
When overridden in a derived class, reads a sequence of bytes from the current stream and advances the position within the stream by the number of bytes read.
public override int Read(byte[] buffer, int offset, int count)Parameters
bufferbyte[]An array of bytes. When this method returns, the buffer contains the specified byte array with the values between
offsetand (offset+count- 1) replaced by the bytes read from the current source.offsetintThe zero-based byte offset in
bufferat which to begin storing the data read from the current stream.countintThe maximum number of bytes to be read from the current stream.
Returns
- int
The total number of bytes read into the buffer. This can be less than the number of bytes requested if that many bytes are not currently available, or zero (0) if the end of the stream has been reached.
Exceptions
- ArgumentException
The sum of
offsetandcountis larger than the buffer length.- ArgumentNullException
bufferis null.- ArgumentOutOfRangeException
offsetorcountis negative.- IOException
An I/O error occurs.
- NotSupportedException
The stream does not support reading.
- ObjectDisposedException
Methods were called after the stream was closed.
ReadAsync(byte[], int, int, CancellationToken)
Asynchronously reads a sequence of bytes from the current stream, advances the position within the stream by the number of bytes read, and monitors cancellation requests.
public override Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)Parameters
bufferbyte[]The buffer to write the data into.
offsetintThe byte offset in
bufferat which to begin writing data from the stream.countintThe maximum number of bytes to read.
cancellationTokenCancellationTokenThe token to monitor for cancellation requests. The default value is System.Threading.CancellationToken.None.
Returns
- Task<int>
A task that represents the asynchronous read operation. The value of the
TResultparameter contains the total number of bytes read into the buffer. The result value can be less than the number of bytes requested if the number of bytes currently available is less than the requested number, or it can be 0 (zero) if the end of the stream has been reached.
Exceptions
- ArgumentNullException
bufferis null.- ArgumentOutOfRangeException
offsetorcountis negative.- ArgumentException
The sum of
offsetandcountis larger than the buffer length.- NotSupportedException
The stream does not support reading.
- ObjectDisposedException
The stream has been disposed.
- InvalidOperationException
The stream is currently in use by a previous read operation.
Seek(long, SeekOrigin)
When overridden in a derived class, sets the position within the current stream.
public override long Seek(long offset, SeekOrigin origin)Parameters
offsetlongA byte offset relative to the
originparameter.originSeekOriginA value of type System.IO.SeekOrigin indicating the reference point used to obtain the new position.
Returns
- long
The new position within the current stream.
Exceptions
- IOException
An I/O error occurs.
- NotSupportedException
The stream does not support seeking, such as if the stream is constructed from a pipe or console output.
- ObjectDisposedException
Methods were called after the stream was closed.