CODEWITHSUNDEEP
c#visual-studio-2010sortedlist
Brezhnews
Brezhnews

Reputation: 1569

Sorted list items

Is it possible to add items to sorted list with the same value, because when I am trying to do so it shows me an error:
"An entry with the same key already exists."
If it's possible, then how?

Upvotes: 1

Views: 2210

Answers (5)

Fozle Rabbi
Fozle Rabbi

Reputation: 129

You can't insert multiple key with same name but you can insert multiple value using the same object. You don't need to used unique object.

I am showing an example

       SortedList sortedList = new SortedList()
       {
           { "Ind", "India" },
           { "Inda", "India" },
           { "BD", "Bangladesh" },
           { "SA", "South Africa" },
           {"SL", "Sri Lanka" },
           {"UAE", "United of Arab Emirates" },
           {"USA", "United States of America" }
       };

       Console.WriteLine("Sorted List Elements");

       foreach(DictionaryEntry item in sortedList)
       {
           Console.WriteLine($"Key: {item.Key}, Value: {item.Value}");
       }

Here, I have taken 7 examples. First two are most similar, I have just change the key not the objects. Objects are the are same. I think you got my point.

Upvotes: 0

sji
sji

Reputation: 1907

It is not possible* to add duplicate keys as stated by other users.

In c# you might be able to use the Lookup class instead, which allows multiple values to be stored with the same key.

See: http://msdn.microsoft.com/en-us/library/bb460184.aspx

* It is possible, see comments, but only by defining a comparitor that never returns equality for equal items, which IMO is a really really bad idea.

Upvotes: 3

Tim Partridge
Tim Partridge

Reputation: 3393

Define a class that implements IComparer. When you instantiate the SortedList, you pass in an instance of your class. Check out Knasterbax's answer.

Upvotes: 0

PraveenVenu
PraveenVenu

Reputation: 8337

Key should be unique. See this in MSDN

ArgumentException   - An element with the specified key already exists in the SortedList object.

http://msdn.microsoft.com/en-us/library/system.collections.sortedlist.add.aspx

Upvotes: 0

Andrew Cooper
Andrew Cooper

Reputation: 32576

No, it's not possible. The keys must be unique.

Upvotes: 2

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