CODEWITHSUNDEEP
c#.netinterface
Joan Venge
Joan Venge

Reputation: 331102

Collecting types that implement a particular interface without casting?

Basically I wanna know if all the types in a particular namespace implements a particular interface like IEnumerable.

I know I can do:

foreach type ...
    if type is IEnumerable
        ...

But I don't wanna cast the type just to query if it implements an interface, because the cast will be thrown away either way.

Upvotes: 0

Views: 178

Answers (3)

Josh Bush
Josh Bush

Reputation: 2718

I think this will work also if you'd rather use lambda syntax.

var enumerables=Assembly.GetExecutingAssembly().GetTypes().Where(t => t.Namespace == "YOUR NAMESPACE HERE").OfType<IEnumerable>();

Upvotes: 1

lc.
lc.

Reputation: 116498

Assuming I've read you correctly, you want a list of types in an enumeration that implement an particular interface or supertype. Perhaps Enumerable.OfType(this IEnumerable source) is useful?

var enumerables = myListOfThingsToCheck.OfType<IEnumerable>();

Upvotes: 3

JoshJordan
JoshJordan

Reputation: 12975

Using the is operator is not a cast, it is a test, which sounds like what you want. Type casting in C# is done either using the forced casting operator (name?) like so:

((IEnumerable)someCollection)

or the safe casting operator:

someCollection as IEnumerable

Upvotes: 6

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