File.AppendAllLines Method (String, IEnumerable<String>, Encoding)

 

Appends lines to a file by using a specified encoding, and then closes the file. If the specified file does not exist, this method creates a file, writes the specified lines to the file, and then closes the file.

Namespace:   System.IO
Assembly:  mscorlib (in mscorlib.dll)

public static void AppendAllLines(
	string path,
	IEnumerable<string> contents,
	Encoding encoding
)

Parameters

path
Type: System.String

The file to append the lines to. The file is created if it doesn't already exist.

contents
Type: System.Collections.Generic.IEnumerable<String>

The lines to append to the file.

encoding
Type: System.Text.Encoding

The character encoding to use.

Exception Condition
ArgumentException

path is a zero-length string, contains only white space, or contains one more invalid characters defined by the GetInvalidPathChars method.

ArgumentNullException

Either path, contents, or encoding is null.

DirectoryNotFoundException

path is invalid (for example, the directory doesn’t exist or it is on an unmapped drive).

FileNotFoundException

The file specified by path was not found.

IOException

An I/O error occurred while opening the file.

PathTooLongException

path exceeds 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.

NotSupportedException

path is in an invalid format.

SecurityException

The caller does not have the required permission.

UnauthorizedAccessException

path specifies a file that is read-only.

-or-

This operation is not supported on the current platform.

-or-

path is a directory.

-or-

The caller does not have the required permission.

The method creates the file if it doesn’t exist, but it doesn't create new directories. Therefore, the value of the path parameter must contain existing directories.

You can use this method to create a file that contains the following:

Universal Windows Platform
Available since 10
.NET Framework
Available since 4.0
Silverlight
Available since 4.0
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