Filter

Returns a new collection containing only the elements of the collection for which the given predicate returns true.

Parameters	Returns
Func<T, bool> predicate IEnumerable<T> source	IEnumerable<T>

Usage

Filtering to get even values in a collection by using a named function

//IEnumerable<int> source = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }

bool NumberIsEven(int value)
{
    return value % 2 == 0;
}

IEnumerable<int> result = source.Filter(NumberIsEven);

//result = { 2, 4, 6, 8, 10 }

Filtering to get even values in a collection by using an anonymous function

//IEnumerable<int> source = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }

IEnumerable<int> result = 
    source.Filter(value => value % 2 == 1);

//result = { 1, 3, 5, 7, 9 }