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File.Open Method (String, FileMode, FileAccess, FileShare)

Silverlight

When it is called by trusted applications, opens a FileStream on the specified path, having the specified mode with read, write, or read/write access and the specified sharing option.

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

Syntax

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

Parameters

path: Type: System.String
The file to open.

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.

share: Type: System.IO.FileShare
A FileShare value specifying the type of access other threads have to the file.

Return Value

Type: System.IO.FileStream
A FileStream on the specified path, having the specified mode with read, write, or read/write access and the specified sharing option.

Exceptions

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 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.
ArgumentOutOfRangeException	mode, access, or share specified an invalid value.
FileNotFoundException	The file specified in path was not found.
NotSupportedException	path is in an invalid format.

Remarks

For more information about trusted applications, see Trusted Applications.

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