File.Open Method (String, FileMode)
[ 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 read/write access.
Assembly: mscorlib (in mscorlib.dll)
'Declaration Public Shared Function Open ( _ path As String, _ mode As FileMode _ ) As FileStream
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.
Return Value
Type: System.IO.FileStreamA FileStream opened in the specified mode and path, with read/write access and not shared.
| Exception | Condition |
|---|---|
| ArgumentException | path is a zero-length string, contains only white space, or contains one or more invalid characters as defined by GetInvalidPathChars. |
| ArgumentNullException | path is Nothing. |
| 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. -or- This operation is not supported on the current platform. -or- path specified a directory. -or- The caller does not have the required permission. |
| ArgumentOutOfRangeException | mode specified an invalid value. |
| FileNotFoundException | The file specified in path was not found. |
| NotSupportedException | path is in an invalid format. |
Version Notes
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.