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Populate Concurrent Dictionary from Dictionary

Anonymous User 2588 18-Dec-2013

How can I populate the data from Dictionary to Concurrent Dictionary.

I have following,

public class Employee
{
    public int Id {get; set; }
    public string Name{ get; set; }
}
var names = new List<Employee> 
{
    new Employee { Id= 1, Name = "Name1" },
    new Employee { Id= 1, Name = "Name1" },
    new Employee { Id= 2, Name = "Name2" },
    new Employee { Id= 3, Name = "Name3" },
};

And I populate to Dictionary like

Dictionary<int, List<Employee>> dict = names.GroupBy(n => n.Id).ToDictionary(g => g.Key, g => g.ToList());

and I want to create,

ConcurrentDictionary<int, List<Employee>> concDict

and I tried,

ConcurrentDictionary<int, List<Employee>> concDict = new ConcurrentDictionary<int, List<Employee>>();

dict.ToList().ForEach(e => concDict.TryAdd(e.Key, e.Value));

Is there any built-in extension method like .ToDictionary?

c# c# 
Updated on 18-Dec-2013
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1 Answers

Anonymous User

Anonymous User

18-Dec-2013
Hi Chintoo,

You can pass the Dictionary<T> into one of the ConcurrentDictionary<T> constructors.

I don't think there's an extension method to do it directly, but it shouldn't be too difficult to write one if you want to avoid all the extra object creation.

public static ConcurrentDictionary<TKey, TElement>
ToDictionary<TSource, TKey, TElement>(this IEnumerable<TSource> source, Func<TSource, TKey> keySelector, Func<TSource, TElement> elementSelector)
{
    var dictionary =new ConcurrentDictionary<TKey, TElement>();
    foreach (TSource local in source)
    {
        dictionary.TryAdd(keySelector(local), elementSelector(local));
    }
    return dictionary;
}

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