Read Method

CryptoStream.Read Method (Byte[], Int32, Int32)


Reads a sequence of bytes from the current stream and advances the position within the stream by the number of bytes read.

Namespace:   System.Security.Cryptography
Assembly:  mscorlib (in mscorlib.dll)

override Read : 
        buffer:byte[] *
        offset:int *
        count:int -> int


Type: System.Byte[]

An array of bytes. A maximum of count bytes are read from the current stream and stored in buffer.

Type: System.Int32

The byte offset in buffer at which to begin storing the data read from the current stream.

Type: System.Int32

The maximum number of bytes to be read from the current stream.

Return Value

Type: System.Int32

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 if the end of the stream has been reached.

Exception Condition

The CryptoStreamMode associated with current CryptoStream object does not match the underlying stream. For example, this exception is thrown when using Read with an underlying stream that is write only.


The offset parameter is less than zero.


The count parameter is less than zero.


Thesum of the count and offset parameters is longer than the length of the buffer.

Universal Windows Platform
Available since 10
.NET Framework
Available since 1.1
Available since 2.0
Windows Phone Silverlight
Available since 7.0
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