Fun with C# Lists… both of them. Part Two of Three
This article is Part Two in the series. Read Part 1 here
Introduction
In this part of the article we will be continuing to work with various methods within the List<Type> class. We will continue to show you how easy it is to work with Lists and how they can be utilized instead of arrays.
We left off after we had populated the List with a set of Automobile Models and the seating capacity associated with each Model. We created the Automobile class and we showed how you would use the Sort method to sort the List of Models in ascending order.
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Implementation
In this part of the implementation we will be working with the seats attribute from the “Automobile” class.
- Seats
The Seats attribute denotes the seating capacity of the vehicle and the Model attribute denotes the Model of the Automobile. These two attributes make up the two values we will be working with when sorting and searching through our List.
Sort the List by seating Capacity
What we are trying to accomplish here is to be able to sort the List by the seating capacity of the Automobile. This is a numeric sort using the value of each attribute. We are using the built in “Sort” method of the List holding all of our Models.
auto.Sort(delegate(Automobile auto1, Automobile auto2) { return auto1.seats.CompareTo(auto2.seats); });
Please see Fig. 2 for the results of the seating capacity search. If you look at the differences between the results in Fig. 1 and in Fig. 2 you will see that the sort order changed and that the Automobile with the least number of available seating is first in the List.
In the next example we will retrieve all of the Automobiles that have a seating capacity less than 5 and sort the results by the seating capacity of the Automobile.
Display of the results of the seating capacity sort [Fig. 2]:
[Click to see full-size]
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Sort and display all of the Automobiles that have less than 5 available seats
What we are trying to accomplish here is to be able to sort the List by the seating capacity of the Automobiles that offer available seating of less than 5 individuals. You will see that we are returning a new List<Automobile> in the “results” List and no longer using the “auto” List for this result set.
Please see Fig. 3 for the results of the seating capacity search of vehicles that allow less than 5 available seats. If you look at the differences between the results in Fig. 2 and in Fig. 3 you will see that the sort order changed and that the Automobile List itself has also changed. The only Automobiles in the List are the ones that have a seating capacity of less than 5.
Because we are using a new List<type> that was derived from the result set of our “FindAll” method call we are not changing the original List<Type> that holds all of our Models and it stays intact.
Display of the results of the seating capacity sort [Fig. 3]:
[Click to see full-size]
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Next Up
In the next part of this series will get into how we display the results of or manipulation in a List Box and show you the finished source code so you can see how everything has tied together to complete this example.
What have we learned?
- Sort the List by seating capacity
- Sort and Display the List of Automobiles with less than 5 available seats
Continue Reading the Final Part
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