Comments on: Parsing textfiles with LINQ (or LINQ-to-TextReader) http://blog.einbu.no/2009/03/parsing-textfiles-with-linq/ Arjan: Technical Learnings of Programmings for Make Benefit Glorious Framework of .NET Fri, 19 Feb 2010 14:16:49 +0000 http://wordpress.org/?v=2.9.2 hourly 1 By: The trouble with delimited « Arjans blog http://blog.einbu.no/2009/03/parsing-textfiles-with-linq/comment-page-1/#comment-308 The trouble with delimited « Arjans blog Fri, 31 Jul 2009 09:34:45 +0000 http://blog.einbu.no/?p=118#comment-308 [...] this previous article articles about parsing files, I took a very simplistic approach to reading a delimited file. I used string.Split, which [...] [...] this previous article articles about parsing files, I took a very simplistic approach to reading a delimited file. I used string.Split, which [...]

]]> By: jim b http://blog.einbu.no/2009/03/parsing-textfiles-with-linq/comment-page-1/#comment-34 jim b Thu, 14 May 2009 14:29:14 +0000 http://blog.einbu.no/?p=118#comment-34 DUH.. it goes here: using (var reader = new StreamReader(@"c:\rejects.txt")) { var query = from line in reader.AsEnumerable() //skip header row //let columns = line.Split(',') let columns = Regex.Split(line, expr) select new { Firstname = columns[0], Lastname = columns[1], Age = columns[2] }; DUH.. it goes here:

using (var reader = new StreamReader(@”c:\rejects.txt”))
{
var query = from line in reader.AsEnumerable() //skip header row
//let columns = line.Split(‘,’)
let columns = Regex.Split(line, expr)
select new
{
Firstname = columns[0],
Lastname = columns[1],
Age = columns[2]
};

]]> By: jim b http://blog.einbu.no/2009/03/parsing-textfiles-with-linq/comment-page-1/#comment-33 jim b Thu, 14 May 2009 14:22:49 +0000 http://blog.einbu.no/?p=118#comment-33 hi, thanks for that... sorry for being rude, was a bit frustrated. Expanding on this idea.. say my splits is a bit more complex: "Salutation","First, Name","Middle,, Name","Last,,, Name" the file is delimited by commas and fields have quotes if there is data. if there happens to be a comma in the quotes we DON"T want to split. so i was thinking regex like this: public static IEnumerable AsEnumerable(this TextReader reader) { string expr = "(?<=\"),(?=\")"; string line; while ((line = reader.ReadLine()) != null) { yield return Regex.Split(line, expr); } } dosn't work tho.. can't implicitly convert string[] to string. hi, thanks for that…
sorry for being rude, was a bit frustrated.
Expanding on this idea..
say my splits is a bit more complex:

“Salutation”,”First, Name”,”Middle,, Name”,”Last,,, Name”

the file is delimited by commas and fields have quotes if there is data. if there happens to be a comma in the quotes we DON”T want to split.

so i was thinking regex like this:

public static IEnumerable AsEnumerable(this TextReader reader)
{
string expr = “(?<=\”),(?=\”)”;
string line;
while ((line = reader.ReadLine()) != null)
{
yield return Regex.Split(line, expr);
}
}

dosn’t work tho.. can’t implicitly convert string[] to string.

]]> By: Arjan Einbu http://blog.einbu.no/2009/03/parsing-textfiles-with-linq/comment-page-1/#comment-29 Arjan Einbu Mon, 11 May 2009 20:46:42 +0000 http://blog.einbu.no/?p=118#comment-29 Thanks for the response, and sorry for my typo. While working on my my post, I changed the name of the GetLines method to AsEnumerable. The GetLines you found must have slipped through... Anyway, <strong>its fixed now</strong>, and your second questions should be easy to answer now too: line is a string, and strings have a Split method on them... Thanks for the response, and sorry for my typo. While working on my my post, I changed the name of the GetLines method to AsEnumerable. The GetLines you found must have slipped through…
Anyway, its fixed now, and your second questions should be easy to answer now too: line is a string, and strings have a Split method on them…

]]> By: jim b http://blog.einbu.no/2009/03/parsing-textfiles-with-linq/comment-page-1/#comment-28 jim b Mon, 11 May 2009 20:14:58 +0000 http://blog.einbu.no/?p=118#comment-28 this looks great. too bad it dosn't work. this is one of those annoying posts that leaves out just enough info so that if you couldn't have done it in the first place anyway you won't be able to use it. where does the reader.GetLines() method come from. how does the array "line" get the Split method. let's just keep it a secret. this looks great. too bad it dosn’t work. this is one of those annoying posts that leaves out just enough info so that if you couldn’t have done it in the first place anyway you won’t be able to use it.
where does the reader.GetLines() method come from.
how does the array “line” get the Split method. let’s just keep it a secret.

]]> By: More parsing textfiles with LINQ « Arjans blog http://blog.einbu.no/2009/03/parsing-textfiles-with-linq/comment-page-1/#comment-9 More parsing textfiles with LINQ « Arjans blog Thu, 02 Apr 2009 17:33:32 +0000 http://blog.einbu.no/?p=118#comment-9 [...] In a previous article, I described how to use LINQ when parsing a textfile. [...] [...] In a previous article, I described how to use LINQ when parsing a textfile. [...]

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