How can I avoid IEnumerable multiple iterations? Is it bad to cast IEnumerable --> ICollection --> IEnumerable to perform validation?

• AsyncEx

  23 3,408 0.0 C#

  A helper library for async/await.

BTW - My use-case is that I am developing nuget packages. My nuget packages are lower level, similar to this: https://github.com/StephenCleary/AsyncEx

• silverback

  10 244 7.3 C#

  Silverback is a simple but feature-rich message bus for .NET core (it currently supports Kafka, RabbitMQ and MQTT).

I tend to declare the parameter as IReadOnlyCollection because I can safely iterate without extra allocations. I know you could just do a ToList by default but it would mean allocating a few arrays in the process, in worst case. You could be smarter and check if the IEnumerable can be casted to IReadOnlyCollection and perform a ToList only when needed, this would be the most flexible implementation. I sometimes create an extension method for this: https://github.com/BEagle1984/silverback/blob/master/src/Silverback.Core/Util/EnumerableAsCollectionExtensions.cs.

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