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and I'd like to initialize it. Tried with

IEnumerable<string> m_oEnum = new IEnumerable<string>() { "1", "2", "3"};
but it say "IEnumerable doesnt contain a method for add string. Any idea? Thanks
Ok, adding to the answers stated you might be also looking for
IEnumerable<string> m_oEnum = Enumerable.Empty<string>();
IEnumerable<string> m_oEnum = new string[]{};
                Old now, but I would avoid the second option. You might want this to interact with other IEnumerables that are not compatible with arrays.
– Joel Coehoorn
                Oct 5, 2018 at 14:23
                Sometimes you'll need to cast this to an IEnumerable. Then a statement like this will do: (IEnumerable<string>)new [] {"1", "2", "3"}
– Carlo Bos
                Nov 16, 2021 at 15:22
IEnumerable<T> is an interface. You need to initiate with a concrete type (that implements IEnumerable<T>). Example:
IEnumerable<string> m_oEnum = new List<string>() { "1", "2", "3"};
IEnumerable is just an interface and so can't be instantiated directly.
You need to create a concrete class (like a List)
IEnumerable<string> m_oEnum = new List<string>() { "1", "2", "3" };
you can then pass this to anything expecting an IEnumerable.
IEnumerable is an interface, instead of looking for how to create an interface instance, create an implementation that matches the interface: create a list or an array.
IEnumerable<string> myStrings = new [] { "first item", "second item" };
IEnumerable<string> myStrings = new List<string> { "first item", "second item" };
You can create a static method that will return desired IEnumerable like this :
public static IEnumerable<T> CreateEnumerable<T>(params T[] values) =>
    values;
//And then use it
IEnumerable<string> myStrings = CreateEnumerable("first item", "second item");//etc..
Alternatively just do :
IEnumerable<string> myStrings = new []{ "first item", "second item"};
        
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