Function Name	GetExtension
Category	File
Icon
Description	Returns the extension of the specified path string.
Inputs	Filename The path string from which to get the extension.
Outputs	Extension The extension of the specified path (including the period "."), or null, or String.Empty. If path is null, GetExtension returns null. If path does not have extension information, GetExtension returns Empty string.
Properties	None -

Sample output

Example

A range of functions are provided for working with Uri's and Path's. The following example demonstrates how these can be used.

In the following example we have a directory c:\UriExamples\ that contains the files Bookstore.xsd, Input001.xml, Input002.xml & ResolvedUri.Output.xml.

In our transform we have configured "ListFiles" to operate on the directory "c:\UriExamples\" and use the pattern "Input*.xml"

As you can see the ListFiles component gets the full paths of all the files that match the pattern. These filenames are then fed into the various Uri functions and output into an XML writer.

The result of the transform is as follows

<FileProperties>
  <File>
    <FullFilename>C:\UriExamples\Input001.xml</FullFilename>
    <Filename>Input001.xml</Filename>
    <Extension>.xml</Extension>
    <Path>C:\UriExamples</Path>
    <AltFullFilename>C:\UriExamples\Backup\Input001.xml</AltFullFilename>
    <BackupFilename>C:\UriExamples\Input001.xml.bak</BackupFilename>
  </File>
  <File>
    <FullFilename>C:\UriExamples\Input002.xml</FullFilename>
    <Filename>Input002.xml</Filename>
    <Extension>.xml</Extension>
    <Path>C:\UriExamples</Path>
    <AltFullFilename>C:\UriExamples\Backup\Input002.xml</AltFullFilename>
    <BackupFilename>C:\UriExamples\Input002.xml.bak</BackupFilename>
  </File>
</FileProperties>

Let's examine the output in more detail

• FullFilename value is what's returned from the ListFiles component, note it's the full path to the file.
• Filename has come via the GetFilename function, which has stripped off the path leaving just the filename.
• Extension has come via the GetExtension function, which has left us with just the extension (note the leading . is preserved).
• Path has come via the GetDirectoryName, this strips the filename leaving just the path (note it's the whole path, not just he parent directory name).
• AltFullFilename demonstrates how alternative paths can be constructed, in this case we take the files path, add the directory name 'Backup' and re-add the filename.
• BackupFilename shows how the ResolveUri method can be used to build filenames based on an existing filename/path. We use the Concat function to append .bak onto the existing filename (giving us Input001.xml.bak), we then resolve this relative to the original file c:\UriExamples\Input001.xml.

Compatibility

Native Execution Engine, XSLT 2.0, C#