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FileDialog.AddExtension Property

Gets or sets a value indicating whether the dialog box automatically adds an extension to a file name if the user omits the extension.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public bool AddExtension { get; set; }

Property Value

Type: System.Boolean
true if the dialog box adds an extension to a file name if the user omits the extension; otherwise, false. The default value is true.

The extension added to a file name depends on the currently selected file filter and the value of the CheckFileExists property.

If the CheckFileExists property is true, the dialog box adds the first extension from the current file filter that matches an existing file. If no files match the current file filter, the dialog box adds the extension specified in the DefaultExt property.

If the CheckFileExists property is false, the dialog box adds the first valid file name extension from the current file filter. If the current file filter contains no valid file name extensions, the dialog box adds the extension specified in the DefaultExt property.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

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

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