• Article

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

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 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.