File::AppendAllLines Method (String^, IEnumerable<String^>^)

.NET Framework (current version)

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Appends lines to a file, 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)

Syntax

C++

public:
static void AppendAllLines(
	String^ path,
	IEnumerable<String^>^ contents
)

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.

Exceptions

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 or contents 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 permission to write to the file.
UnauthorizedAccessException	path specifies a file that is read-only. -or- This operation is not supported on the current platform. -or- path is a directory.

Remarks

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.

The following example writes selected lines from a sample data file to a file, and then appends more lines. The directory named temp on drive C must exist for the example to complete successfully.

C++

No code example is currently available or this language may not be supported.

Version Information

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