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Reduce memory usage of ExportToFile #7

merged 5 commits into from Feb 24, 2016


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commented Feb 24, 2016

The current implementation of ExportToFile uses a lot of memory for large CSV files because it builds the entire document in memory. This pull request uses a streaming approach to reduce the memory overhead to a constant.


  • Run the sample code before the changes and save the results to old.csv
  • Run the sample code after the changes and save the result to new.csv
  • Assert that there is no diff between old.csv and new.csv

c-w added some commits Feb 24, 2016

Reduce memory usage of ExportToFile
Using `File.WriteAllText` and `Export` builds the entire CSV string and
then writes it to disk. This essentially doubles the peak memory usage
of the class and is impractical for larger CSV documents.

Using `File.WriteAllLines` and `ExportToLines` on the other hand only
keeps a single row in memory at a time.

jitbit pushed a commit that referenced this pull request Feb 24, 2016

Merge pull request #7 from c-w/master
Reduce memory usage of ExportToFile

@jitbit jitbit merged commit 70216ae into jitbit:master Feb 24, 2016

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