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18 mar 2010 · public static int FindIndex<T>(this IEnumerable<T> items, Predicate<T> predicate) { int index = 0; foreach (var item in items) { if (predicate(item)) break; index++; } return index; } Note that it will return the number of items instead of -1 when there is no match.
Use the overload of Select which takes an index in the predicate, so you transform your list into an (index, value) pair: var pair = myList.Select((Value, Index) => new { Value, Index }) .Single(p => p.Value.Prop == oProp);
Searches for an element that matches the conditions defined by a specified predicate, and returns the zero-based index of the first occurrence within the List<T> or a portion of it. This method returns -1 if an item that matches the conditions is not found.
Searches for an element that matches the conditions defined by a specified predicate, and returns the zero-based index of the first occurrence within an Array or a portion of it.
Searches for the specified object and returns the zero-based index of the first occurrence within the range of elements in the List<T> that extends from the specified index to the last element. public: int IndexOf (T item, int index); public int IndexOf (T item, int index);
5 gru 2021 · This post will discuss how to find the index of an element in a list in C#. The solution should either return the index of the first occurrence of the required element or -1 if it is not present in the list. 1. Using List<T>.IndexOf () method.
27 maj 2021 · I would like to know how to get the index of an object from a LINQ query in addition to the result set itself. Once I have the index of the result set, I would like to remove the item from the same list I am querying.
