How to write contents of System.Collections.Specialized.StringCollection to file?

Question

I have had no luck searching the obvious places for an answer to why using File.WriteAllLines(); doesn't work when outputting a StringCollection:

static System.Collections.Specialized.StringCollection infectedLog = new System.Collections.Specialized.StringCollection();

Omitting code here that has populated infectedLog.......

File.WriteAllLines(@"C:\CustomSearchInfectedFiles.txt", infectedLog);

Could anyone either tell me what I am doing wrong, or point me in the direction of an explanation that will please?

_How_ does it not work? What is the error? – Joshua Honig Feb 17 '12 at 14:03 — Joshua Honig, Feb 17 '12 at 14:03

score 8 · Accepted Answer · answered Feb 17 '12 at 14:03

8

The File.WriteAllLines expects an IEnumerable<string> (or a string[]) whereas StringCollection only implements IEnumerable (note the lack of generic type). Try the following:

using System.Linq;
...
File.WriteAllLines(@"C:\CustomSearchInfectedFiles.txt", infectedLog.Cast<string>());

answered Feb 17 '12 at 14:03

Rich O'Kelly

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Perfect. You're a star. Thank-you! :) – Feb 17 '12 at 14:05

score 1 · Answer 2 · answered Feb 17 '12 at 14:04

1

try this

File.WriteAllLines(@"C:\CustomSearchInfectedFiles.txt", infectedLog.Cast<string>());

answered Feb 17 '12 at 14:04

L.B

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score 1 · Answer 3 · answered Feb 17 '12 at 14:08

The problem is that StringCollection is a really cold collection. It does not implement IEnumerable<T>, and it is not an array, so there is no overload of WriteAllLines for it.

You can do this:

File.WriteAllLines(theFileName, infectedLog.Cast<string>());

Or, you could switch to a more modern collection type, like a List<string>.

score 0 · Answer 4 · answered Feb 17 '12 at 14:11

0

        using (StreamWriter w = File.AppendText(@"testfile.txt"))
        {
            foreach (var line in sc)
            {
                w.WriteLine(line);
            }
            w.Close();
        }

answered Feb 17 '12 at 14:11

paramosh

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How to write contents of System.Collections.Specialized.StringCollection to file?

4 Answers4