Sort an ArrayList of Objects in C#

Question

How can I sort an ArrayList of objects? I have implemented the IComparable interface while sorting the ArrayList, but I am not getting the required result.

My code sample:

public class Sort : IComparable
{
    public string Count { get; set; }
    public string Url { get; set; }
    public string Title { get; set; }

    public int CompareTo(object obj)
    {
        Sort objCompare = (Sort)obj;
        return (this.Count.CompareTo(objCompare.Count));
    }
}

Here I want to sort the ArrayList based on Count.

@Srikanth Tell us which .NET version you're using for your development :) (re-tag your question for this). — Matías Fidemraizer, Jan 30 '12 at 13:32
"i am not getting the required result" is not enough information. Please read http://tinyurl.com/so-hints and update your question. Also, do you *have* to use `ArrayList` rather than `List`? Non-generic collections are, like, so 2004. — Jon Skeet, Jan 30 '12 at 13:34

score 3 · Accepted Answer · answered Jan 30 '12 at 13:39

try this:

public class Sort : IComparable<Sort>
{
    public string Count { get; set; }
    public string Url { get; set; }
    public string Title { get; set; }

    public virtual int CompareTo(Sort obj)
    {
        return (Count.CompareTo(obj.Count));
    }
}

as Count is string, it may not sort the way you expect....

score 0 · Answer 2 · answered Jan 30 '12 at 13:33

0

According to the MSDN documentation:

To perform a stable sort, you must implement a custom IComparer interface to use with the other overloads of this method.

answered Jan 30 '12 at 13:33

M.Babcock

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score 0 · Answer 3 · answered Jan 30 '12 at 13:42

0

Or you can just use a LINQ construct to get a sorted version of your list, like so:

var results = myArrayList.OrderBy(x => x.Count).ToList();

Is there a reason you are not using LINQ (yet)?

answered Jan 30 '12 at 13:42

Roy Dictus

32,551
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This doesn't compile and gives the error `Error CS1061 'ArrayList' does not contain a definition for 'OrderBy' and no accessible extension method 'OrderBy' accepting a first argument of type 'ArrayList' could be found (are you missing a using directive or an assembly reference?)` – Matthew Lock Feb 21 '22 at 12:39
See correct answer here https://stackoverflow.com/a/852490/74585 – Matthew Lock Feb 21 '22 at 12:42

Sort an ArrayList of Objects in C#

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