[GitHub] [arrow] westonpace commented on issue #35019: [C#] Exception on basic usage

["westonpace (via GitHub)" <gi...@apache.org>]

westonpace commented on issue #35019:
URL: https://github.com/apache/arrow/issues/35019#issuecomment-1504270077

   The C# Arrow implementation does not provide a parquet reader (this is different than most other implementations).  The `ArrowFileReader` that you are using is for reading Arrow IPC files, not parquet files.  These are two different formats (the parquet format is more focused on compression and minimizing I/O while the Arrow IPC format aims to be a mirror of the in-memory format to allow for things like memory-mapped zero-copy reads)
   
   The exception you are getting is because the arrow file reader is not finding the expected magic number at the end of the file (all Arrow IPC files end with ARROW1).
   
   I believe there are other C# projects you can use which provide parquet readers/writers.


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