Cannot convert type 'string' to 'System.Collections.ArrayList

Question

Here is my code

   private static ArrayList GetFirstObjectFromDictionary(Dictionary<string, string> dictionary)
    {
        foreach (ArrayList arr in dictionary.Values) //error 
        {
            return arr;
        }
        return null;
    }

It causes error "Cannot convert type 'string' to 'System.Collections.ArrayList'".

Your dictionary.Values s type is Dictionary<string,string>.ValueCollection. So you can't cast it directly ArrayList and this code is not look meaningful! Can you explain what you want to do? — Furkan Ekinci
– Furkan Ekinci, Commented May 25, 2013 at 18:37
@Furkan Ekinci -Actually i want to take every item in dictionary to ArrayList in type of object,Before implementing Dictionary i have used hashtable for the same piece of code,due to performance reason i have changed data structure to Dictionary. — user2067120
– user2067120, Commented May 27, 2013 at 3:40

Furkan Ekinci · Accepted Answer · 2013-05-27 05:55:02Z

1

You can use KeyValuePair for reach dictionary's items.

private static ArrayList GetFirstObjectFromHashTable(Dictionary<string, string> dictionary)
{
    ArrayList aLst = new ArrayList();

    foreach (KeyValuePair<string, string> pair in dictionary)
    {
        aLst.Add(pair.Value);
    }

    return aLst;
}

This page might help you to understand foreach using with dictionaries.

answered May 27, 2013 at 5:55

Furkan Ekinci

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