Introduction

Linq and List of Lists is a powerful combination of technologies that can be used to create powerful and efficient data structures. Linq is a set of language-integrated query (LINQ) technologies that allow developers to query and manipulate data in a variety of ways. List of Lists is a data structure that allows for the storage of multiple lists of data in a single data structure. Together, these two technologies can be used to create powerful and efficient data structures that can be used to store and manipulate data in a variety of ways.

Solution

public static List GetUniqueValues(List> listOfLists)
{
return listOfLists.SelectMany(x => x).Distinct().ToList();
}

allDevices.Where(d => d.Options.Any(o => o.Name == "Foot Pedal" && o.Installed));

Solved: Linq and List of Lists

Linq is a powerful language-integrated query (LINQ) technology that provides a consistent query experience for objects, XML, relational data, and other data sources. It is a set of features that extends powerful query capabilities to the language syntax of C# and Visual Basic. In this article, we will discuss how to use Linq to work with a List of Lists.

Creating a List of Lists

The first step is to create a List of Lists. This can be done by using the List> class. This class allows us to create a list of lists, where each list contains elements of the same type. For example, we can create a list of lists of integers as follows:

List> listOfLists = new List>();

Adding Elements to the List of Lists

Once we have created the list of lists, we can add elements to it. This can be done by using the Add() method. For example, we can add a list of integers to the list of lists as follows:

List list = new List { 1, 2, 3, 4, 5 };
listOfLists.Add(list);

Querying the List of Lists with Linq

Once we have created the list of lists and added elements to it, we can query it using Linq. For example, we can use the SelectMany() method to flatten the list of lists into a single list. This can be done as follows:

List flattenedList = listOfLists.SelectMany(x => x).ToList();

We can also use Linq to query the list of lists. For example, we can use the Where() method to filter the list of lists based on a condition. This can be done as follows:

List filteredList = listOfLists.Where(x => x.Contains(3)).SelectMany(x => x).ToList();

The above code will return a list of integers that contain the number 3.

Conclusion

In this article, we discussed how to use Linq to work with a List of Lists. We saw how to create a list of lists, add elements to it, and query it using Linq. We also saw how to use the SelectMany() and Where() methods to flatten and filter the list of lists.