File.Open Method (String, FileMode, FileAccess)

FileOpen Method (String, FileMode, FileAccess)

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

Namespace: System.IO
Assembly: mscorlib (in mscorlib.dll) Version: 4.0.0.0

Syntax

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

path: Type: SystemString
The file to open.
mode: Type: System.IOFileMode
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.IOFileAccess
A FileAccess value that specifies the operations that can be performed on the file.

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

Exceptions

Exception	Condition
ArgumentException	path is a zero-length string, contains only white space, or contains one or more invalid characters as defined by InvalidPathChars.-or- access specified Read and mode specified Create, CreateNew, Truncate, or Append.
ArgumentNullException	path is null.
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. -or-mode is Create and the specified file is a hidden file.
ArgumentOutOfRangeException	mode or access specified an invalid value.
FileNotFoundException	The file specified in path was not found.
NotSupportedException	path is in an invalid format.