How to Find an Element's Index Using LINQ?

Find index using LINQ

In programming, it is often necessary to retrieve the index of a specific element in a data structure. This can be easily achieved using LINQ (Language Integrated Query).

Use Select and First

To find the index of the first element in a data source that meets a specific condition, you can use the following method:

<code class="language-c#">myCars.Select((v, i) => new {car = v, index = i}).First(myCondition).index;</code>

Here, we use the Select method to create a new anonymous object for each element in the data source, including its value and index. We then use the First method to retrieve the first object that satisfies the specified myCondition predicate. Finally, we access the index property of the selected object to get the desired index.

Short variant

For brevity, you can use a slightly shorter version of this method:

<code class="language-c#">myCars.Select((car, index) => new {car, index}).First(myCondition).index;

myCars.Select((car, index) => (car, index)).First(myCondition).index;</code>

In these variations, we omit the intermediate anonymous object creation step.

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