How do you find the index of an element in Linq?

LINQ does not have an IndexOf method. So to find out index of a specific item we need to use FindIndex as int index = List. FindIndex(your condition); 0.

How to find index of element in list in c#?

To get the index of an item in a single line, use the FindIndex() and Contains() method. int index = myList. FindIndex(a => a.

How to use find index in c#?

FindIndex(Predicate) Method Syntax: public int FindIndex (Predicate match); Parameter: match: It is the Predicate delegate that defines the conditions of the element to search for. Return Value: It returs the index of the first occurrence of an element that matches the conditions defined by match, if found.

What is the difference between findIndex and IndexOf?

findIndex – Returns the index of the first element in the array where predicate is true, and -1 otherwise. indexOf – Returns the index of the first occurrence of a value in an array.

How do you find the index of an element in an array?

To find the position of an element in an array, you use the indexOf() method. This method returns the index of the first occurrence the element that you want to find, or -1 if the element is not found. The following illustrates the syntax of the indexOf() method.

What is an index C#?

Index type in C# is a number that can be used for indexing. Index counts a collection items from the beginning. To count a collection items from the end, a prefix (^) operator can be used with an Index.

How do you find the index of an array of objects?

JavaScript Array findIndex() The method executes the function once for each element present in the array: If it finds an array element where the function returns a true value, findIndex() returns the index of that array element (and does not check the remaining values)

How to get an array index in LINQ?

The first string strInput will contain one ‘X’, the position of which should be equal to the value of an element in the pattern string. I need the index of the element in pattern.

How to find the index of a list?

The list then provides it’s first item. Select then transforms that item into what it needs to spit out (in this case, just the int 0) and gives it to Where. Where takes that item and runs it’s function which determine’s that it’s true and so spits out 0 to ToList, which adds it to the list.

Do you need to use LINQ to find object in list?

You don’t need to use LINQ, you can use FindIndex of List : Keep in mind, that you should have in-memory List to use this Linq to Objects method. Not the answer you’re looking for?

How to get the index of a car in LINQ?

Therefore, LINQ does not have an IndexOf method. myCars.Select ( (car, index) => (car, index)).First (myCondition).index; It works! Think about it. The index of the first matching item equals the number of (not matching) item before it.