get index c#
int index = Array.IndexOf(arr,item);c# find all indexes
public static int[] FindAllIndexOf<T>(this T[] array, Predicate<T> filter)
{
// Note: If select does not find a match returns index as "-1"
int[] indexes = array.Select((elementInArray, index) => filter(elementInArray) ? index : -1)
.Where(index => index != -1).ToArray();
return indexes;
}Copyright © 2021 Codeinu
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