CODEWITHSUNDEEP
.netienumerabledeferred-execution
Nelson Rothermel
Nelson Rothermel

Reputation: 9756

Check if return type is IEnumerable<T>

How can I check if the return type of a function is IEnumerable<T>? In other words, I don't want to match List<T>, even though it implements IEnumerable<T>. Or put even another way, how can I detect if a function has deferred execution?

Upvotes: 0

Views: 415

Answers (1)

Kirk Woll
Kirk Woll

Reputation: 77576

I assume you are interacting with a MethodInfo?

Type returnType = methodInfo.ReturnType;
bool isEnumerable = returnType.IsGenericType && 
                    returnType.GetGenericTypeDefinition() == typeof(IEnumerable<>);

Of course, just because it returns IEnumerable doesn't mean it uses deferred execution (i.e. yield return) and there's no real way to check for that without decompiling the code.

Upvotes: 3

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