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FileSystem.ReadAllBytes Method

Returns the contents of a file as a byte array.

Namespace:  Microsoft.VisualBasic.FileIO
Assembly:  Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)

public static byte[] ReadAllBytes(
	string file


Type: System.String

File to be read.

Return Value

Type: System.Byte[]
Byte array containing the contents of the file.


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.


file is Nothing.


The file does not exist.


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


The path exceeds the system-defined maximum length.


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


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


The user lacks necessary permissions to view the path.

The ReadAllBytes method of the My.Computer.FileSystem object allows you to read from a binary file. The contents of the file are returned as a byte array.

Do not make decisions about the contents of the file based on the name of the file. For example, the file Form1.vb may not be a Visual Basic source file. Verify all inputs before using the data in your application.

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

This example reads from the file C:/Documents and Settings/selfportrait.jpg.

  "C:/Documents and Settings/selfportrait.jpg")

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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