How to find index of item in array in C#
By FoxLearn 10/25/2024 9:07:53 AM 3
Using Array.IndexOf
in C#
The Array.IndexOf method searches for the specified object and returns the index of its first occurrence within the array. If the item is not found, it returns -1.
For example:
int[] numbers = { 10, 20, 30, 40, 50 }; int itemToFind = 30; int index = Array.IndexOf(numbers, itemToFind);
You can use Array.IndexOf
for any type of array, whether it's integers, strings, or custom objects, as long as the type implements equality comparison.
Using Array.FindIndex
in C#
For example:
string[] answers = new string[] {"A","B","C","D"} var index = Array.FindIndex(answers, x => x == "A");
In C#, Array.FindIndex
is a method that allows you to find the index of an element in an array based on a specific condition defined by a predicate.
In this case, x => x == "A"
is a lambda expression that checks if the number is equal to "A".
If you have an array of custom objects, you can use Array.FindIndex
like this:
class Person { public string Name { get; set; } } //Main.cs Person[] people = { new Person { Name = "Alice" }, new Person { Name = "Bob" }, new Person { Name = "Charlie" } }; // Find index of person with Name "Bob" int index = Array.FindIndex(people, person => person.Name == "Bob");
Array.FindIndex is useful for finding an index based on conditions. You can define complex conditions using a lambda expression and it works with any data type, including custom objects.
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