Get a List Value by Index in C#

by Michael Sacco Published January 12, 2024
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Introduction

In Unity, C# is widely used for scripting and development. When working with lists in C#, you might encounter a situation where you need to retrieve a specific value by its index. This article will tell you how.

Accessing List Elements by Index

In C#, you access a list element by index using square bracket notation.

Assuming you have a list named myList. Here’s how you can retrieve the first item:

List<string> myList = new List<string>{"Item1", "Item2", "Item3"};
var firstItem = myList[0];

This line of code fetches the element at index 0 from the list and assigns it to the variable firstItem. This notation is similar to how you would access elements in an array.

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Access List Element Using ElementAt Extension Method

Another approach is to use the ElementAt extension method provided by LINQ. This method is applicable when you want more flexibility or need to handle cases where the list might not have an element at the specified index.

using System.Linq;
var myList = new List<string>{"Yes", "No", "Maybe"};
var firstItem = myList.ElementAt(0);

Make sure to include the System.Linq namespace to use this extension method. This method is useful when you need to perform additional operations on the element retrieved.

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Access List Element by Index from End

You can use Index to fetch a particular value based on the index from end. Use the caret notation, ^ to index from end. In the following example, you use Index to get the last element in the list.

var myList = new List<int>{0, 1, 2};
var lastElement = myList[^1];

πŸ’‘ Info:

  • When you use the index from end, you need to use the one-base index. If you use a value of ^0, the runtime will throw an index out of range error.

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Access a Range of List Elements by Index

You can use GetRange to access a subset of a list based on the start and end index. In the following example, you use Index to get the first three elements of the list at indices 0, 1, and 2.

var myList = new List<int>{1, 2, 3, 4, 5};
var resultsRange = myList.GetRange(0,2);

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Conclusion

In Unity C#, you will need to retrieve a list value by index. You are now equipped to do so. With a few options to choose from, you can pick the approach that works best for your use case. Whether using square bracket notation, the ElementAt method, the Index class, or the GetRange method, understanding these methods will enhance your ability to work efficiently with lists in Unity.

Remember to choose the method that best fits your specific requirements and coding style. Happy coding!

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