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Showing content from https://learn.microsoft.com/dotnet/api/system.io.fileaccess below:

FileAccess Enum (System.IO) | Microsoft Learn

FileAccess Enum Definition

Defines constants for read, write, or read/write access to a file.

This enumeration supports a bitwise combination of its member values.

public enum class FileAccess

[System.Flags]
public enum FileAccess

[System.Flags]
[System.Serializable]
public enum FileAccess

[System.Flags]
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public enum FileAccess

[<System.Flags>]
type FileAccess =

[<System.Flags>]
[<System.Serializable>]
type FileAccess =

[<System.Flags>]
[<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type FileAccess =

Public Enum FileAccess

Inheritance

Attributes

Fields Name Value Description Read 1

Read access to the file. Data can be read from the file. Combine with Write for read/write access.

Write 2

Write access to the file. Data can be written to the file. Combine with Read for read/write access.

ReadWrite 3

Read and write access to the file. Data can be written to and read from the file.

Examples

The following FileStream constructor grants read-only access to an existing file (FileAccess.Read).

FileStream s2 = new FileStream(name, FileMode.Open, FileAccess.Read, FileShare.Read);

let s2 = new FileStream(name, FileMode.Open, FileAccess.Read, FileShare.Read)

Dim s2 As New FileStream(name, FileMode.Open, FileAccess.Read, FileShare.Read)

For an example of creating a file and writing text to a file, see How to: Write Text to a File. For an example of reading text from a file, see How to: Read Text from a File. For an example of reading from and writing to a binary file, see How to: Read and Write to a Newly Created Data File.

A FileAccess parameter is specified in many of the constructors for File, FileInfo, FileStream, and other constructors where it is important to control the kind of access users have to a file.