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I have a class in my code that is already deriving from IEnumerable. I was wondering if there is a way that I can use a "Contains" method on its instnaces to look for a something in that list?
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Use Any() Instead of Count() To See if an IEnumerable Has Any Objects. An IEnumerable is an implementation that supports simple iteration using an enumerator.
IEnumerable in C# is an interface that defines one method, GetEnumerator which returns an IEnumerator interface. This allows readonly access to a collection then a collection that implements IEnumerable can be used with a for-each statement.
In C#, an IEnumerable can be converted to a List through the following lines of code: IEnumerable enumerable = Enumerable. Range(1, 300); List asList = enumerable. ToList();
We can get first item values from IEnumerable list by using First() property or loop through the list to get respective element. IEnumerable list is a base for all collections and its having ability to loop through the collection by using current property, MoveNext and Reset methods in c#, vb.net.
Do you really implement the non-generic IEnumerable, or the generic IEnumerable<T>? If you can possibly implement the generic one, your life will become a lot simpler - as then you can use LINQ to Objects, which does indeed have a Contains extension method.
Otherwise, you could potentially convert from the non-generic to generic using Cast or OfType, e.g.
bool found = nonGeneric.Cast<TargetType>().Contains(targetItem);
It would be nicer if you just implemented the generic interface to start with though :)
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