[mono-android] What´s wrong with this piece of code?

[Morten Nilsen]

Hi

I suspect this might be caused by your use of IList/IDictionary for variables..
I’m not sure a List<Dictionary<string,object>> would accept an object of type IDictionary<string,object>..
What if, one day, the curGroupMap is changed to be an instance of MusicalDictionary<string,object>?

You either need to do groupData.Add((Dictionary<string, object>)curGroupMap) or stop casting everything into interfaces, I believe.
If you really do want to have interfaces rather than classes here, your list needs to agree with that.
Not everything has to be an interface, by the way – especially not internally in a method.

  -- mvh, Morten


From: monodroid-bounces at lists.ximian.com [mailto:monodroid-bounces at lists.ximian.com] On Behalf Of Carlo Bolz
Sent: Friday, March 11, 2011 1:36 PM
To: Monodroid at lists.ximian.com
Subject: [mono-android] What´s wrong with this piece of code?

Hello,

what´s wrong with this piece of code:

            IList<IDictionary<string, object>> groupData = new List<Dictionary<string, object>>() as IList<IDictionary<string, object>>;
            IList<IList<IDictionary<string, object>>> childData = new List<List<Dictionary<string, object>>>() as IList<IList<IDictionary<string, object>>>;

            for (int i = 0; i < 20; i++)
            {
                IDictionary<string, object> curGroupMap = new Dictionary<string, object>();
                curGroupMap.Add(NAME, "Group " + i.ToString());
                curGroupMap.Add(ISEVEN, (i % 2 == 0) ? "This group is even" : "This group is odd");
                groupData.Add(curGroupMap); // < the app dies here

Any suggestions?
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