CODEWITHSUNDEEP
c#.net
Joper
Joper

Reputation: 8219

How simply convert collection of one type to collection of another type

Lets say i have collection IList<Items> items = GetItems(); I want to convert that collection in to collection of MyDbSet<Items>

MyDbSet declared like that: public class MyDbSet<T> : IDbSet<T> where T : class

How can i do that with the less amount of code, possibly it is better to go with linq?

Upvotes: 1

Views: 357

Answers (2)

MarcinJuraszek
MarcinJuraszek

Reputation: 125650

I don't think there is a way other than just loop over the source collection and call Add on your MyDbSet class instance, however it can be hidden in custom extension method:

public static class MyEnumerable
{
    public static MyDbSet<T> ToMyDbSet<T>(this IEnumerable<T> source)
        where T : class
    {
        var collection = new MyDbSet<T>();

        foreach (var item in source)
            collection.Add(item);

        return collection;
    }
}

Usage:

IList<Items> items = GetItems();

MyDbSet<Items> itemsSet = items.ToMyDbSet();

Upvotes: 1

CodesInChaos
CodesInChaos

Reputation: 108830

For collections that support ICollection<T>.Add you could write a helper method like this:

public static TCollection CreateCollection<TCollection,TElement>(IEnumerable<TElement> seq)
    where TCollection:ICollection<TElement>, new
{
    var coll=new TCollection();
    foreach(var element in seq)
      coll.Add(element);
    return coll;
}

which is used like:

var coll = CreateCollection<MyDbSet<T>, T>(seq);

But personally I'd rather write an AddRange(seq) extension method and then use it like:

var coll = new MyDbSet<T>();
coll.AddRange(seq);

Upvotes: 1

Related Questions