FileShare Enumeration

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Contains constants for controlling the kind of access other FileStream objects can have to the same file.

This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.

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

[SerializableAttribute]
[FlagsAttribute]
public enum FileShare

Member nameDescription
NoneDeclines sharing of the current file. Any request to open the file (by this process or another process) will fail until the file is closed.
ReadAllows subsequent opening of the file for reading. If this flag is not specified, any request to open the file for reading (by this process or another process) will fail until the file is closed. However, even if this flag is specified, additional permissions might still be needed to access the file.
WriteAllows subsequent opening of the file for writing. If this flag is not specified, any request to open the file for writing (by this process or another process) will fail until the file is closed. However, even if this flag is specified, additional permissions might still be needed to access the file.
ReadWriteAllows subsequent opening of the file for reading or writing. If this flag is not specified, any request to open the file for reading or writing (by this process or another process) will fail until the file is closed. However, even if this flag is specified, additional permissions might still be needed to access the file.

A typical use of this enumeration is to define whether two processes can simultaneously read from the same file. For example, if a file is opened and Read is specified, other users can open the file for reading but not for writing.

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