Article
11/18/2011

FileInfo.Open Method (FileMode, FileAccess, FileShare)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

When it is called by trusted applications, opens a file in the specified mode with read, write, or read/write access and the specified sharing option.

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

Syntax

'Declaration
Public Function Open ( _
    mode As FileMode, _
    access As FileAccess, _
    share As FileShare _
) As FileStream

public FileStream Open(
    FileMode mode,
    FileAccess access,
    FileShare share
)

Parameters

mode
Type: System.IO.FileMode
A FileMode constant specifying the mode (for example, Open or Append) in which to open the file.

access
Type: System.IO.FileAccess
A FileAccess constant specifying whether to open the file with Read, Write, or ReadWrite file access.

share
Type: System.IO.FileShare
A FileShare constant specifying the type of access other FileStream objects have to this file.

Return Value

Type: System.IO.FileStream
A FileStream object opened with the specified mode, access, and sharing options.

Exceptions

Exception	Condition
SecurityException	The caller does not have the required permission.
ArgumentException	path is empty or contains only white spaces.
FileNotFoundException	The file is not found.
ArgumentNullException	One or more arguments is nulla null reference (Nothing in Visual Basic).
UnauthorizedAccessException	path is read-only or is a directory.
DirectoryNotFoundException	The specified path is invalid, such as being on an unmapped drive.
IOException	The file is already open.

Remarks

Platform Notes

Silverlight for Windows Phone

This member has a SecurityCriticalAttribute attribute on Silverlight for Windows Phone, because the attribute was present in Silverlight 3. This attribute restricts this member to internal use. Application code that uses this member throws a MethodAccessException.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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