Remove Content From Text File

I need to know how to remove content from a text file.

basically I am stripping attachments from an Email.

so

IF the text file contains the string
"Content-Type: application/"
Then
Delete the row above that line and everything after that line to the end of the doc


it looks like this

Code:

---

------=_NextPart_000_xxxxxxxrandomcharactersxxxxxxx
Content-Type: application/pdf;
asdf
asdf
asdfasdf
asdf
asdf
asd
fasd
fasd
fasdf
------=_NextPart_000_xxxxxxxrandomcharactersxxxxxxx

---

i would want to delete that entire chunk

anyone have any thoughts?

You would scan each line and store each line in an array or list. Then, upon checking each line, if the contents include "Content-Type: application/" then remove the element of the array or list before the current one and all indexes after that element. However, instead of removing all wrong data, which could be a lot, I'd rather suggest you only keeping the data you need. It's a different way to do the same thing, but should be a lot faster. There's your logic. To accomplish this, you can use many classes. How are you getting this email? From a file? In which case you could use a StreamReader, BinaryReader, TextReader, FileStream, or whatever! Take your pick. There's lots of tutorials to be found on google for each.

Thanks for the quick reply

Basically I am using raw MAI files to train a bayesian dictionary.
The problem is that the attachments take up HUGE amounts of file space for no reason (11GB at the moment).

Once the dictionary is trained, the files get deleted, so there is no reason to retain the message after processing, but more importantly, i need to remove the attachments from the files.

I see your suggestion about keeping the data I need, but am new to .NET so I am unsure where to start or what terms to Google.

Thanks again...