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#1 Posted : Tuesday, November 21, 2017 5:10:03 PM(UTC)


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The DocumentWriter object contains static classes that can be used to obtain information about file formats and extensions. The DocumentWriter.GetFormatFileExtension() and DocumentWriter.GetFormatFriendlyName() methods can be used to obtain, respectively, the default extension and a user-friendly name for the specified format.

The expected parameter is a value in the DocumentFormat enumeration. It is important to note that DocumentFormat.User is a special case and only used under specific circumstances. As such, it is not a valid value to be used with either of these methods and an exception will be generated. For more information, see the documentation.


var extension = DocumentWriter.GetFormatFileExtension(DocumentFormat.Docx);
var friendlyName = DocumentWriter.GetFormatFriendlyName(DocumentFormat.Docx);

This value of "extension" and "friendlyName" would be "docx" and "Microsoft Word" for this code snippet.

Here's one in which all extensions and friendly names can be printed to the console.


DocumentFormat[] docFormats = (DocumentFormat[])Enum.GetValues(typeof(DocumentFormat));
for (int i = 0; i < docFormats.Length; i++)
   if (docFormats[i] == DocumentFormat.User)

   var extension = DocumentWriter.GetFormatFileExtension(docFormats[i]);
   var friendlyName = DocumentWriter.GetFormatFriendlyName(docFormats[i]);

      "DocumentFormat:\t" + Enum.GetName(typeof(DocumentFormat), 
      docFormats[i]).PadRight(8) + "\tExtension: " + extension 
      + "\tFriendlyName: " + friendlyName

Edited by moderator Friday, January 31, 2020 3:58:08 PM(UTC)  | Reason: Updated doc links to v20 and formatted sample code

Nick Crook
Developer Support Engineer
LEAD Technologies, Inc.

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