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FileSystem.FileLen Method

Returns a Long value that specifies the length of a file in bytes. The My feature gives you better productivity and performance in file I/O operations than FileLen. For more information, see GetFileInfo.

Namespace:  Microsoft.VisualBasic
Assembly:  Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)

public static long FileLen(
	string PathName


Type: System.String

Required. String expression that specifies a file. PathName may include the directory or folder, and the drive.

Return Value

Type: System.Int64
Long value that specifies the length of a file in bytes.


File does not exist.

If the specified file is open when the FileLen function is called, the value returned represents the size of the file at the time it was opened.


To obtain the current length of an open file, use the LOF function.

This example uses the FileLen function to return the length of a file in bytes. For purposes of this example, assume that TestFile is a file that contains some data.

Dim MySize As Long 
' Returns file length (bytes).
MySize = FileLen("TESTFILE")

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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