File.Open Method (String, FileMode, FileAccess)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Opens a FileStream on the specified path, with the specified mode and access.

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

Syntax

Public Shared Function Open ( _
    path As String, _
    mode As FileMode, _
    access As FileAccess _
) As FileStream

public static FileStream Open(
    string path,
    FileMode mode,
    FileAccess access
)

mode
Type: System.IO..::.FileMode
A FileMode value that specifies whether a file is created if one does not exist, and determines whether the contents of existing files are retained or overwritten.

access
Type: System.IO..::.FileAccess
A FileAccess value that specifies the operations that can be performed on the file.

Type: System.IO..::.FileStream
An unshared FileStream that provides access to the specified file, with the specified mode and access.

Exception	Condition
ArgumentException	path is a zero-length string, contains only white space, or contains one or more invalid characters as defined by GetInvalidPathChars. -or- access specified Read and mode specified Create, CreateNew, Truncate, or Append.
ArgumentNullException	path is nullNothingnullptra null reference (Nothing in Visual Basic).
PathTooLongException	The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters, and file names must be less than 260 characters.
DirectoryNotFoundException	The specified path is invalid, (for example, it is on an unmapped drive).
IOException	An I/O error occurred while opening the file.
UnauthorizedAccessException	path specified a file that is read-only and access is not Read. -or- path specified a directory. -or- The caller does not have the required permission.
ArgumentOutOfRangeException	mode or access specified an invalid value.
FileNotFoundException	The file specified in path was not found.
NotSupportedException	path is in an invalid format.

Windows Phone

This member has a SecurityCriticalAttribute attribute. This attribute restricts this member to internal use. Application code that uses this member throws a MethodAccessException.