FOR-EACH over an IEnumerable vs a List

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Category:Languages

Is there any benefit or difference if my for-each loop is going through the method argument if I pass in that argument as an IEnumerable or if I pass that argument as a List?

 


No there isn't. In both cases the for-each is translated to something like this

var enumerator = input.GetEnumerator(); while(enumerator.MoveNext()) {   // loop body } 

Additionally, if the enumerator is disposable, it will be disposed after the loop.

Jon Skeet gives a detailed description here.

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