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FileSystemWatcher Constructor (String, String)

.NET Framework 4

Initializes a new instance of the FileSystemWatcher class, given the specified directory and type of files to monitor.

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

public FileSystemWatcher(
	string path,
	string filter
)

Parameters

path: Type: System.String
The directory to monitor, in standard or Universal Naming Convention (UNC) notation.

filter: Type: System.String
The type of files to watch. For example, "*.txt" watches for changes to all text files.

Exceptions

Exception	Condition
ArgumentNullException	The path parameter is null. -or- The filter parameter is null.
ArgumentException	The path parameter is an empty string (""). -or- The path specified through the path parameter does not exist.
PathTooLongException	path is too long.

Exception

Condition

ArgumentNullException

The path parameter is null.

-or-

The filter parameter is null.

ArgumentException

The path parameter is an empty string ("").

-or-

The path specified through the path parameter does not exist.

PathTooLongException

path is too long.

Remarks

Note
The component will not watch the specified directory until the Path is set, and EnableRaisingEvents is true.

The component can watch files on your personal computer, a network drive, or a remote computer.

You cannot watch a remote computer that does not have Windows NT or Windows 2000. You cannot watch a remote Windows NT 4.0 computer from a Windows NT 4.0 computer.

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET Framework Security

SecurityAction.LinkDemand
for full trust for the immediate caller. This member cannot be used by partially trusted code.

Platforms

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.