FileStream Constructor (String, FileMode, FileAccess)
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Initializes a new instance of the FileStream class with the specified path, creation mode, and read/write permission.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- path
- Type: System.String
A relative or absolute path for the file that the current FileStream object will encapsulate.
- mode
- Type: System.IO.FileMode
A FileMode constant that determines how to open or create the file.
- access
- Type: System.IO.FileAccess
A FileAccess constant that determines how the file can be accessed by the FileStream object. This gets the CanRead and CanWrite properties of the FileStream object. CanSeek is true if path specifies a disk file.
| Exception | Condition |
|---|---|
| ArgumentNullException | path is null. |
| ArgumentException | path is an empty string (""), contains only white space, or contains one or more invalid characters. -or- path refers to a non-file device, such as "con:", "com1:", "lpt1:", etc. in an NTFS environment. |
| NotSupportedException | path refers to a non-file device, such as "con:", "com1:", "lpt1:", etc. in a non-NTFS environment. |
| ArgumentException | path is an empty string (""), contains only white space, or contains one or more invalid characters. |
| FileNotFoundException | The file cannot be found, such as when mode is FileMode.Truncate or FileMode.Open, and the file specified by path does not exist. The file must already exist in these modes. |
| IOException | An I/O error occurs, such as specifying FileMode.CreateNew and the file specified by path already exists. -or- The stream has been closed. |
| SecurityException | The caller does not have the required permission. |
| DirectoryNotFoundException | The specified path is invalid, such as being on an unmapped drive. |
| UnauthorizedAccessException | The access requested is not permitted by the operating system for the specified path, such as when access is Write or ReadWrite and the file or directory is set for read-only access. |
| 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. |
| ArgumentOutOfRangeException | mode contains an invalid value. |
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.