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FileStream.Write Method

.NET Framework 4.5

Writes a block of bytes to the file stream.

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

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

Parameters

array: Type: System.Byte[]
The buffer containing data to write to the stream.

offset: Type: System.Int32
The zero-based byte offset in array from which to begin copying bytes to the stream.

count: Type: System.Int32
The maximum number of bytes to write.

Exceptions

Exception	Condition
ArgumentNullException	array is null.
ArgumentException	offset and count describe an invalid range in array.
ArgumentOutOfRangeException	offset or count is negative.
IOException	An I/O error occurred. - or - Another thread may have caused an unexpected change in the position of the operating system's file handle.
ObjectDisposedException	The stream is closed.
NotSupportedException	The current stream instance does not support writing.

Remarks

This method overrides Write.

The offset parameter gives the offset of the byte in array (the buffer index) at which to begin copying, and the count parameter gives the number of bytes that will be written to the stream. If the write operation is successful, the current position of the stream is advanced by the number of bytes written. If an exception occurs, the current position of the stream is unchanged.

Note
Use the CanWrite property to determine whether the current instance supports writing. For additional information, see CanWrite.

Do not interrupt a thread that is performing a write operation. Although the application may appear to run successfully after the thread is unblocked, the interruption can decrease your application's performance and reliability.

For a list of common file and directory operations, see Common I/O Tasks.

Examples

This code example is part of a larger example provided for the Lock method.

C++

// Write the original file data. 
if(fileStream.Length == 0)
{
    tempString = 
        lastRecordText + recordNumber.ToString();
    fileStream.Write(uniEncoding.GetBytes(tempString), 
        0, uniEncoding.GetByteCount(tempString));
}

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Platforms

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Reference

FileStream Class

System.IO Namespace

Other Resources

File and Stream I/O

How to: Read Text from a File

How to: Write Text to a File

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