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FileAccessMode Enum


Specifies whether to access a file in read-only mode or in read/write mode.

public enum class FileAccessMode
/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
enum class FileAccessMode
[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
public enum FileAccessMode
var value =
Public Enum FileAccessMode

Windows requirements

Device family
Windows 10 (introduced in 10.0.10240.0)
API contract
Windows.Foundation.UniversalApiContract (introduced in v1.0)


Read 0

Access the file stream in read-only mode.

Keep read-only file streams open only while your app is actively reading from the file. You can use multiple independent read-only streams to read a file. If the file is changed while you're reading it, subsequent read operations fail.

ReadWrite 1

Access the file stream in read/write mode.

A file supports a single stream for writing. Writing is non-transactional and occurs in place; that is, data is written immediately to the target file without using a temporary file. Use read/write mode only when you're ready to write immediately in order to avoid conflicts with other operations.


For more explanation on usage, see OpenAsync.

Applies to