I want to create a custom class that can be initialized like arrays can,
var myCollection = new MyCollection<string> {"a", "b", "c"}
Is there a syntax for creating a class that can interpret that?
I know how to do a similar thing with class properties, such as
var person = new Person { Name = "Santi", LastName = "Arizti" };
But that is not what I am looking for.
This question might already exist, but I just don't know the name of this feature to effectively search it online.
Your class must
IEnumerableAdd methodThat's it.
public class MyCollection<T> : IEnumerable<T>
{
protected readonly List<T> _list = new List<T>();
public void Add(T item)
{
_list.Add(item);
}
IEnumerator IEnumerable.GetEnumerator()
{
return _list.GetEnumerator();
}
public IEnumerator<T> GetEnumerator()
{
return _list.GetEnumerator();
}
}
public class Program
{
public static void Main()
{
var x = new MyCollection<string>
{
"A","B"
};
}
}
Here is a Link to Fiddle
Constructing an object using {...} simply creates it using the default constructor and calls an Add method present on it for each of the arguments (or tuples of arguments if nested {...} is used). It only has to implement IEnumerable.
Your example is essentially equivalent to:
var myCollection = new MyCollection<string>();
myCollection.Add("a");
myCollection.Add("b");
myCollection.Add("c");
Here's the simplest example of such a class that can be "initialized" with anything:
public class TestClass : IEnumerable
{
public void Add<T>(params T[] args)
{
}
IEnumerator IEnumerable.GetEnumerator()
{
throw new NotImplementedException();
}
}
