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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?
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To convert a dictionary to an array in Python, use the numpy. array() method, and pass the dictionary object to the np. array() method as an argument and it returns the array.
Dictionary<string, object> dict = new Dictionary<string, object>(); var arr = dict. Select(z => z. Value). ToArray();
A dictionary is sometimes called an associative array because it associates a key with an item. The keys behave in a way similar to indices in an array, except that array indices are numeric and keys are arbitrary strings. Each key in a single Dictionary object must be unique.
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.
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