File.AppendText Method
Microsoft Silverlight will reach end of support after October 2021. Learn more.
When it is called by trusted applications, creates a StreamWriter that appends UTF-8 encoded text to an existing file.
Namespace: System.IO
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Shared Function AppendText ( _
path As String _
) As StreamWriter
public static StreamWriter AppendText(
string path
)
Parameters
- path
Type: System.String
The path to the file to append to.
Return Value
Type: System.IO.StreamWriter
A StreamWriter that appends UTF-8 encoded text to an existing file.
Exceptions
| Exception | Condition |
|---|---|
| UnauthorizedAccessException | The caller does not have the required permission. |
| 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 nulla null reference (Nothing in Visual Basic). |
| 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). |
| NotSupportedException | path is in an invalid format. |
Remarks
For more information about trusted applications, see Trusted Applications.
Platform Notes
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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.