parse lines using linq to txt

Question

var t1 = from line in File.ReadAllLines(@"alkahf.txt")
                     let item = line.Split(new string[] {". "}, StringSplitOptions.RemoveEmptyEntries)
                     let verse = line.Split(new string[] { "\n. " }, StringSplitOptions.RemoveEmptyEntries)
                     select new
                     {
                         Index = item,
                         Text = verse
                     };

having problems with above code im unsure how to parse the lines properly.

the format of the file is like so, I would also like to ignore any empty lines StringSplitOptions.RemoveEmptyEntries doesn't work for some reason

1. This is text it might have numbers

2. I skipped a line

Answer 1

In the LINQ part, you are inside a single line, so you might want to exclude the empty lines first:

from line in File.ReadAllLines(@"alkahf.txt")
where !string.IsNullOrEmpty(line)

You then do two splits - one on newline, which is odd (since that won't be there, since we know we are reading lines). I expect you mean something like:

let parts = line.Split('.')
where parts.Length == 2
select new {
    Index = parts[0],
    Text = parts[1]
};

?

Also, note that ReadAllLines is a buffered operation; if you want true streaming, you might want something like:

public static IEnumerable<string> ReadLines(string path) {
    using(var reader = File.OpenText(path)) {
        string line;
        while((line = reader.ReadLine()) != null) {
            yield return line;
        }
    }
}

which is not buffering (you don't load the entire file at once). Just change the first line to:

from line in ReadLines(@"alkahf.txt")

Answer 2

thanks to Marc's I fixed my issue, sorry for the late response I'm working on this as a personal project.

the code is like so

 var t1 = from line in StreamReaderExtension.ReadLinesFromFile(@"alkahf.txt")
                     let parts = line.Split(new string[]{". "},StringSplitOptions.RemoveEmptyEntries)
                     where !string.IsNullOrEmpty(line)                     
                     && int.Parse(parts[0].ToString()).ToString() != ""
                     select new
                     {
                         Index = parts[0],
                         Text = parts[1]
                     };

the int parse addition makes sure that the input is returning an integer, if your using this code it's a good idea to set a flag in case it picks ups a non-integer or it will go unnoticed.