StreamWriter Constructor (String, Boolean, Encoding)
Initializes a new instance of the StreamWriter class for the specified file by using the specified encoding and default buffer size. If the file exists, it can be either overwritten or appended to. If the file does not exist, this constructor creates a new file.
Namespace: System.IO
Assembly: mscorlib (in mscorlib.dll)
Parameters
- path
- Type: System.String
The complete file path to write to.
- append
- Type: System.Boolean
true to append data to the file; false to overwrite the file. If the specified file does not exist, this parameter has no effect, and the constructor creates a new file.
- encoding
- Type: System.Text.Encoding
The character encoding to use.
| Exception | Condition |
|---|---|
| UnauthorizedAccessException | Access is denied. |
| ArgumentException | path is empty. -or- path contains the name of a system device (com1, com2, and so on). |
| ArgumentNullException | path is a null reference (Nothing in Visual Basic). |
| DirectoryNotFoundException | The specified path is invalid (for example, it is on an unmapped drive). |
| IOException | path includes an incorrect or invalid syntax for file name, directory name, or volume label syntax. |
| PathTooLongException | The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must not exceed 248 characters, and file names must not exceed 260 characters. |
| SecurityException | The caller does not have the required permission. |
This constructor initializes the Encoding property using the encoding parameter. For additional information, see Encoding.
path can be a file name, including a file on a Universal Naming Convention (UNC) share.
path is not required to be a file stored on disk; it can be any part of a system that supports access via streams.
.gif?cs-save-lang=1&cs-lang=fsharp "Caution note") Caution |
|---|
When you compile a set of characters with a particular cultural setting and retrieve those same characters with a different cultural setting, the characters might not be interpretable, and could cause an exception to be thrown. |
For a list of common I/O tasks, see Common I/O Tasks.
- FileIOPermission
for reading and writing files. Associated enumeration: FileIOPermissionAccess.Read, FileIOPermissionAccess.Write
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
