Write Method

MemoryStream.Write Method (Byte[], Int32, Int32)


Writes a block of bytes to the current stream using data read from a buffer.

Namespace:   System.IO
Assembly:  mscorlib (in mscorlib.dll)

public override void Write(
	byte[] buffer,
	int offset,
	int count


Type: System.Byte[]

The buffer to write data from.

Type: System.Int32

The zero-based byte offset in buffer at which to begin copying bytes to the current stream.

Type: System.Int32

The maximum number of bytes to write.

Exception Condition

buffer is null.


The stream does not support writing. For additional information see CanWrite.


The current position is closer than count bytes to the end of the stream, and the capacity cannot be modified.


offset subtracted from the buffer length is less than count.


offset or count are negative.


An I/O error occurs.


The current stream instance is closed.

This method overrides Write.

The offset parameter gives the offset of the first byte in buffer to write from, and the count parameter gives the number of bytes to write. If the write operation is successful, the current position within the stream is advanced by the number of bytes written. If an exception occurs, the current position within the stream is unchanged.

Except for a MemoryStream constructed with a byte[] parameter, write operations at the end of a MemoryStream expand the MemoryStream.

This code example is part of a larger example provided for the MemoryStream class.

// Write the first string to the stream.
memStream.Write(firstString, 0 , firstString.Length);

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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