Convert Dictionary.keyscollection to array of strings
I have a Dictionary<string, List<Order>>
and I want to have the list of keys in an array. But when I choose
string[] keys = dictionary.Keys;
This doesn't compile.
How do I convert KeysCollection
to an array of Strings?
Assuming you're using .NET 3.5 or later (using System.Linq;
):
string[] keys = dictionary.Keys.ToArray();
Otherwise, you will have to use the CopyTo method, or use a loop :
string[] keys = new string[dictionary.Keys.Count];
dictionary.Keys.CopyTo(keys, 0);
With dictionary.Keys.CopyTo (keys, 0);
If you don't need the array (which you usually don't need) you can just iterate over the Keys.
Use this if your keys isn't of type string. It requires LINQ.
string[] keys = dictionary.Keys.Select(x => x.ToString()).ToArray();
Unfortunately, I don't have VS nearby to check this, but I think something like this might work:
var keysCol = dictionary.Keys;
var keysList = new List<???>(keysCol);
string[] keys = keysList.ToArray();
where ??? is your key type.