File Content Extraction 26.2
Filter SDK .NET Programming Guide

# Using Document Objects

This topic provides some additional guidance about using document objects in your code.

- A `Document` must be created and used on the same thread that created the parent session.

- Changing session configuration options can change the data that is returned by methods of a document object, even if you created the document object before changing the configuration.

  Consider the following example. You have a document with embedded images but no subfiles and you run the following code:

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      using (Document myDoc = session.Open(inputFilePath))
      {
           myDoc.Subfiles().Count(); // Returns 0

           session.Config().ExtractImages(true);

           myDoc.Subfiles().Count(); // Returns 3
      }

  This example shows that the `ExtractImages` session configuration option must not be changed while iterating over subfiles - because the list of subfiles would be invalidated. OpenText recommends disposing all objects created by open `Document` objects before changing the session configuration.

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Version 26.2 | Last updated April 2026

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Product: File Content Extraction 26.2

Topic Title: Using Document Objects