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StreamReader.ReadBlockAsync Method

April 12, 2014

Reads a specified maximum number of characters from the current stream asynchronously and writes the data to a buffer, beginning at the specified index.

Namespace:  System.IO
Assembly:  mscorlib (in mscorlib.dll)
'Déclaration
Public Overrides Function ReadBlockAsync ( _
	buffer As Char(), _
	index As Integer, _
	count As Integer _
) As Task(Of Integer)

Parameters

buffer
Type: System.Char ()
When this method returns, contains the specified character array with the values between index and (index + count - 1) replaced by the characters read from the current source.
index
Type: System.Int32
The position in buffer at which to begin writing.
count
Type: System.Int32
The maximum number of characters to read. If the end of the stream is reached before the specified number of characters is written into the buffer, the method returns.

Return Value

Type: System.Threading.Tasks.Task(Of Int32)
A task that represents the asynchronous read operation. The value of the TResult parameter 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.
ExceptionCondition
ArgumentNullException

buffer is Nothing.

ArgumentOutOfRangeException

index or count is negative.

ArgumentException

The sum of index and count is larger than the buffer length.

ObjectDisposedException

The stream has been disposed.

InvalidOperationException

The reader is currently in use by a previous read operation.

The task does not complete until either the number of characters specified by the count parameter are read, or the end of the stream has been reached.

Windows Phone OS

Supported in: 8.1, 8.0

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