FindIndex

Returns the index of the first element in the collection that satisfies the given predicate.

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

Exceptions

Type	When
InvalidOperationException	The predicate function returns false for all elements.

Usage

Find the index ofthe first even number

//IEnumerable<int> source = { 1, 3, 5, 7, 8, 9, 10 }
bool result = source.FindIndex(value => value % 2 == 0);

//result = 4