FileSystem.WriteAllBytes(String, Byte[], Boolean) Method

Reference

Definition

Namespace:: Microsoft.VisualBasic.FileIO

Assembly:: Microsoft.VisualBasic.Core.dll

Assembly:: Microsoft.VisualBasic.dll

Source:: FileSystem.vb

Source:: FileSystem.vb

Source:: FileSystem.vb

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Writes data to a binary file.

public:
 static void WriteAllBytes(System::String ^ file, cli::array <System::Byte> ^ data, bool append);

public static void WriteAllBytes (string file, byte[] data, bool append);

static member WriteAllBytes : string * byte[] * bool -> unit

Public Shared Sub WriteAllBytes (file As String, data As Byte(), append As Boolean)

Parameters

file: String

Path and name of the file to be written to.

data: Byte[]

Data to be written to the file.

append: Boolean

True to append to the file contents; False to overwrite the file contents. Default is False.

Exceptions

ArgumentException

The path is not valid for one of the following reasons: it is a zero-length string; it contains only white space; it contains invalid characters; or it is a device path (starts with \\.\); it ends with a trailing slash.

ArgumentNullException

file is Nothing.

FileNotFoundException

The file does not exist.

IOException

The file is in use by another process, or an I/O error occurs.

PathTooLongException

The path exceeds the system-defined maximum length.

NotSupportedException

A file or directory name in the path contains a colon (:) or is in an invalid format.

OutOfMemoryException

There is not enough memory to write the string to buffer.

SecurityException

The user lacks necessary permissions to view the path.

Examples

This example appends the data array CustomerData to the file CollectedData.

My.Computer.FileSystem.WriteAllBytes(
  "C:\MyDocuments\CustomerData", CustomerData, True)

Remarks

If the specified path, excluding the file name, is not valid, a DirectoryNotFoundException exception will be thrown. If the path is valid but the file does not exist, the file is created.

Note

The WriteAllBytes method opens a file, writes to it, and then closes it. Code that uses the WriteAllBytes method is simpler than code that uses a BinaryWriter object. However, if you are adding data to a file using a loop, a BinaryWriter object can provide better performance because you only have to open and close the file once.

The following table lists an example of a task involving the My.Computer.FileSystem.WriteAllBytes method.

To	See
Write to a binary file	How to: Write to Binary Files in Visual Basic

Applies to