Solved

Sort a dictionary

Posted on 2009-04-09
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Last Modified: 2013-11-11
I have a hashed structure that is bound to a repeater, that I would like to sort on display:

Dictionary<Level, Dictionary<ControlCode, Dictionary<Person, List<Roles>>>>

It is bound into a repeater with nested repeaters - and displays appropriately, however unsorted.  I would like it to be sorted by level, then by the Description property of the ControlCode, then by the LastName of the Person.

I am having trouble with sorting the ControlCode level.

The ControlCode class does not implement iComparable - and even if it did it would most likely sort by the code - where in this case I need to sort by the Description.  (Otherwise I could change to SortedDictionary).  I thought that I should be able to use LINQ to sort this (perhaps the OrderBy), but cannot seem to figure it out.


Based on the way the data gets into the structure - I cannot sort going in - it needs to be sorted once the structure is complete.

Any help?
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Question by:mrichmon
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6 Comments
 
LVL 4

Expert Comment

by:Xcone
ID: 24112128
Can't you create a new class which inherits from ControlCode and implement IComparable for it. That way you can fully customize how they're compared which allows you to simply use sorted dictionary.
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Accepted Solution

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Xcone earned 500 total points
ID: 24112216
You could also write your own ControlCodeComparer and give it as parameter to your SortedDictionary. See attached code, hopefully it'll give some ideas
    SortedDictionary<ControlCode, string> dict = new SortedDictionary<ControlCode, string>(new ControlCodeComparer<ControlCode>());
 
    public class ControlCodeComparer<T> : IComparer<T> where T:ControlCode
    {
        public int Compare(T a, T b)
        {  
            return String.Compare(((ControlCode)a).Description, ((ControlCode)b).Description);
        }
    }

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LVL 35

Author Comment

by:mrichmon
ID: 24116601
Xcone,

>>Can't you create a new class which inherits from ControlCode and implement IComparable for it
In this case no, however, I like the second idea - I did not realize that there was a constructor for a SortedDictionary that took in a custom comparer as a parameter.  That works great! I guess I should have looked at the SortedDictionary documentation ;o)
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LVL 35

Author Comment

by:mrichmon
ID: 24116991
Sorry - wrong comment got marked as answer, - I have asked it be corrected so Xcone you will get the points/accepted solution.

Thanks again - actually that gave me a way to do something much fancier than I originally thought I could!
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