I would like to generate (and then print or save) big XPS documents (>400 pages) from my WPF application. We have some large amount of in-memory data that needs to be written to XPS.
How can this be done without getting an OutOfMemoryException? Is there a way I can write the document in chunks? How is this usually done? Should I not be using XPS for large files in the first place?
The root cause of the OutOfMemoryException seems to be the creation of the huge FlowDocument. I am creating the full FlowDocument and then sending it to the XPS document writer. Is this the wrong approach?
I can confirm that XPS does not throw out-of-memory on long documents. Both in theory (because operations on XPS are page-based, it doesn't try to load whole document in memory), and in practice (I use XPS-based reporting, and seen run-away error messages add up to many thousands of pages).
Could it be that the problem is in a single particularly large page? A huge image, for example? Large page with high DPI resolution? If single object in document is too big to be allocated at once, it will lead to out-of-memory exception.