Condividi tramite

  • Articolo

StreamWriter Constructor (String, Boolean)

Microsoft Silverlight will reach end of support after October 2021. Learn more.

When it is called by trusted applications, initializes a new instance of the StreamWriter class for the specified file on the specified path, using the default encoding and 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)

Syntax

'Declaration
Public Sub New ( _
    path As String, _
    append As Boolean _
)

public StreamWriter(
    string path,
    bool append
)

Parameters

  • append
    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.

Exceptions

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 nulla null reference (Nothing in Visual Basic).
DirectoryNotFoundException

The specified path is invalid; for example, it might refer to 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 be less than 248 characters, and file names must be less than 260 characters.
SecurityException

The caller does not have the required permission.

Remarks

Platform Notes

Silverlight for Windows Phone 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

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

XNA Framework

Supported in: Xbox 360, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.