Csvhelper: Support for appending new record to the existing file
Current WriteRecord/WriteRecords methods overwrite existing records.
No support for appending new record to the existing file.
GraceYuJuSong
All 4 comments
When you open the file, either open in append mode, or open and seek to the end of the file. You can do this all via the FileStream. CsvHelper takes in a TextReader/TextWriter and doesn't know anything about files.
JoshClose
on 4 Oct 2013
Just thought I'd mention a detail about this: where it's complicated is when there's a header for a CSV you're writing. That's the situation where having some real 'append' logic would help. However, I'm not sure where that responsibility would lie.
killnine
on 21 Dec 2015
So you're appending and you have headers, so it writes the header again? Does turning headers off for writing not work in that situation?
JoshClose
on 21 Dec 2015
Yeah, the way I was going to resolve was to actually set it via some logic at runtime with an if-check on File.Exists(...).
killnine
on 21 Dec 2015
Related issues
CallMeBruce
路
4Comments
mabead
路
3Comments
shinriyo
路
6Comments
malinru
路
5Comments
RizwanAhmedJutt
路
5Comments
Most helpful comment
When you open the file, either open in append mode, or open and seek to the end of the file. You can do this all via the
FileStream. CsvHelper takes in aTextReader/TextWriterand doesn't know anything about files.