Strategy to keep csv string and Dictionary synchronized at all times

Question

If I have a comma separated list string property:

"age:123,name:john,last:doe"

And another property of Dictionary type.

How could I keep both of these properties synchronized such that added to either one will update the other.

example:

obj.CsvString += "address:123 drive";

or

obj.SomeDic.Add("address", "123 drive");

How could I do this? Should there be other methods to adding/removing?

Encapsulate the pair into a single type. That way all accesses to either would have to go through your class where you could keep them synchronized. — Jeff Mercado, Jul 14 '11 at 19:45

score 4 · Accepted Answer · answered Jul 14 '11 at 19:46

4

Do you HAVE to do both?

I would only add to the dictionary and have a method that returns the dictionary as a string. No sync required then.

answered Jul 14 '11 at 19:46

Ryan Bennett

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@bemused: Argh... ToList->ForEach... Here's a better approach: `String.Join(",", dict.Select(x => x.Key + ":" + x.Value))` – Jeff Mercado Jul 14 '11 at 20:07

score 0 · Answer 2 · answered Jul 14 '11 at 19:46

0

You'll need to implement your own class that either derives from Dictionary, or implements IDictionary. You can then overload (implement) your own add/update/remove methods that both stores your in-memory version (the dictionary) as well as the CSV.

answered Jul 14 '11 at 19:46

CodingGorilla

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score 0 · Answer 3 · edited May 23 '17 at 10:34

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You could implement or borrow an ObservableDictionary and use it as SomeDic. Then, in the changed event, change the backing field for your CSV. In the set_CsvString setter, you can replace the dictionary field with a new one based on the CSV.

edited May 23 '17 at 10:34

Community

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answered Jul 14 '11 at 19:46

agent-j

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score 0 · Answer 4 · answered Jul 14 '11 at 19:46

You can create you own class that inherits from IList, then create an event that gets raised when you add an element.

You can then subscribe to the event and when ever it is raised you just update the other list/dictionary.

public class CustomList : IList<T>

Strategy to keep csv string and Dictionary synchronized at all times

4 Answers4