Bug 21094 - Dictionary adding rather than inserting
Summary: Dictionary adding rather than inserting
Alias: None
Product: Class Libraries
Classification: Mono
Component: mscorlib ()
Version: unspecified
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2014-07-03 10:59 UTC by Paul Johnson
Modified: 2014-07-04 06:41 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

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Description Paul Johnson 2014-07-03 10:59:03 UTC
Using this with Xam.iOS on the alpha channel (so built against mono 3.6)

Consider the following code

var five = new Dictionary<int, char>();
                    for (int i = fiveback.Year; i <= lastyear.Year; ++i)
                        five.Add(i, ' ');
                    foreach (var cr in cropDetails)
                        var yrList = cropDetails.Where(t => t.Paddock == cr.Paddock).Select(t => t.Year).ToList();
                        foreach (var y in yrList)
                            if (five.ContainsKey(y.Year))
                                var yr = five.Keys.FirstOrDefault(t => t == y.Year);
                                int r = 0;
                                for (int i = fiveback.Year; i < lastyear.Year; ++i)
                                    if (i != yr)
                                        five[r] = cr.CropCode;
                        cropDict.Add(cr.Paddock, five);

(I'm using this as OrderDictionary isn't available - will file that as a different bug)

The loop is simple - I test to see if the key is contained, if it is, iterate again and fine where in the dictionary it is. Once found, I insert as I would in an array (following how it's done here http://stackoverflow.com/questions/1243717/how-to-update-the-value-stored-in-dictionary-in-c).

Instead of inserting at the correct position, a new dictionary entry is added at the end

lastyear = DateTime.Now.AddYears(-1), five years is DateTime.Now.AddYears(-5)
Comment 1 Paul Johnson 2014-07-03 11:03:44 UTC
OrderedDictionary bug : #21095
Comment 2 Marek Safar 2014-07-04 06:41:14 UTC
You cannot insert at specific position in dictionary