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What is the value of default(IEnumerable<T>) in .NET 4.0, C# ? (Pretty much straightforward)
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IEnumerable interface is a generic interface which allows looping over generic or non-generic lists. IEnumerable interface also works with linq query expression. IEnumerable interface Returns an enumerator that iterates through the collection.
The default value for reference and nullable types is null . The FirstOrDefault method does not provide a way to specify a default value. If you want to specify a default value other than default(TSource) , use the DefaultIfEmpty<TSource>(IEnumerable<TSource>, TSource) method as described in the Example section.
IEnumerable will execute select query on server side, load data in-memory on client side and then filter data. IEnumerable can be used for querying data from in-memory collections like List, Array etc.
null
default Keyword:
will be null for reference types and zero for value types.
IEnumerable is not value type, so result will be null
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It is null because it is a reference type.
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