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How to split an IEnumerable of IEnumerables to one flat IEnumerable using LINQ (or someway else)?
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All LINQ methods are extension methods to the IEnumerable<T> interface. That means that you can call any LINQ method on any object that implements IEnumerable<T> . You can even create your own classes that implement IEnumerable<T> , and those classes will instantly "inherit" all LINQ functionality!
IEnumerable. IEnumerable<T> contains a single method that you must implement when implementing this interface; GetEnumerator, which returns an IEnumerator<T> object. The returned IEnumerator<T> provides the ability to iterate through the collection by exposing a Current property.
Language-Integrated Query (LINQ) is the name for a set of technologies based on the integration of query capabilities directly into the C# language. Traditionally, queries against data are expressed as simple strings without type checking at compile time or IntelliSense support.
The major difference between IQueryable and IEnumerable is that IQueryable executes query with filters whereas IEnumerable executes the query first and then it filters the data based on conditions.
enumerable.SelectMany(x => x)
var result = from e in enumerables
from v in e
select v;
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