StreamWriter Constructor (String, Boolean, Encoding)

[ 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 StreamWriter class for the specified file on the specified path, 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)

public StreamWriter(
	string path,
	bool append,
	Encoding encoding


Type: System.String
The complete file path to write to.
Type: System.Boolean
true to append data to an existing file; false to overwrite an existing file. If the specified file does not exist, a new file is created regardless of the value of this parameter.
Type: System.Text.Encoding
The character encoding to use.


Access is denied.


path is empty.


path contains the name of a system device (com1, com2, etc).


path is null.


The specified path is invalid; for example, it might refer to an unmapped drive.


path includes an incorrect or invalid syntax for file name, directory name, or volume label syntax.


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.


The caller does not have the required permission.

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.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

© 2015 Microsoft