LINQ PropertyInfo out of range Exception when using List[i] but fine when declared variable tagged

Asked Dec 23 '16 at 16:29

Active Dec 23 '16 at 16:36

Viewed 32 times

public List<string> ExcludeHeaders(IEnumerable<ARandomClass> query, List<string> Excludes)
    {
        var qu = query.FirstOrDefault().GetType().GetProperties().AsEnumerable();
        for (int y = 0; y < Excludes.Count; y++)
        {
            qu = qu.Where(c => c.Name != Excludes[y]);
        }

        return qu.Select(s => s.Name).ToList();
    }

This results in an error : Index out of Range

Whereas this works :

public List<string> ExcludeHeaders(IEnumerable<ARandomClass> query, List<string> Excludes)
    {
        var qu = query.FirstOrDefault().GetType().GetProperties().AsEnumerable();
        for (int y = 0; y < Excludes.Count; y++)
        {
            var str = Excludes[y];
            qu = qu.Where(c => c.Name != str);
        }

        return qu.Select(s => s.Name).ToList();
    }

losing my mind over this.

edited Dec 23 '16 at 16:36

asked Dec 23 '16 at 16:29

EnZ

1

Don't post screenshots of code, add you actual code to your question. – DavidG Dec 23 '16 at 16:30
Please copy and paste the actual text of the code into your question. – vbnet3d Dec 23 '16 at 16:31
Done as requested. – EnZ Dec 23 '16 at 16:33
This is apparently the well known `for` loop capture problem. Just someone has to find the duplicate. – Ivan Stoev Dec 23 '16 at 16:34
does this occur with LINQ? – EnZ Dec 23 '16 at 16:37
1

Another solution is to just add a single `.Where(c => !Excludes.Contains(c.Name))` or even `.Where(c => Excludes.All(e => e != c.Name))` instead of having the loop. – itsme86 Dec 23 '16 at 16:38

LINQ PropertyInfo out of range Exception when using List[i] but fine when declared variable tagged

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