Introduction
In this article we will be working with List< Type>, in 2.0 C# implemented List<Type> to allow you to utilize Lists of any kind and to easily manipulate those Lists with some built in methods. We will explore a couple of those methods in this article and demonstrate how easy it is to work with List< Type>. Those methods are:
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- Sort
- FindAll
We have all had difficulty working with lists of any kind, we would have to use arrays and list boxes and write a lot of code to handle a problem that should be so simple.
Implementation
In this article we will be working with a class called “Automobile”, this class has two attributes called
- Seats
- Model
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.
Automobile Class
This is the Automobile class that describes all of the attributes that are shared amongst all models of Automobile that derive from this class.
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{
public int seats;
public string model;
public Automobile(int seats, string model)
{
this.seats = seats;
this.model = model;
}
}
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Declare the List
This is where we declare the List. We assign it a Type of Automobile. What we are saying is that we need a collection of Automobile Classes to work with.
Populate the List with values
We are populating the List with all of the Models and the seating capacity of those Models. In this example we are using 6 different Models, each one with a unique name and with a unique seating capacity.
auto.Add(new Automobile(4, "Mustang"));
auto.Add(new Automobile(5, "Accord"));
auto.Add(new Automobile(3, "F-150"));
auto.Add(new Automobile(7, "Entourage"));
auto.Add(new Automobile(8, "Pilot"));
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Sort the List by Model
What we are trying to accomplish here is to be able to sort the List by the Model. This is an alphabetical sort using the first character of each word. We are using the built in “Sort” method of the List holding all of our Models.
Please see Fig. 1 for the results of the Model search. You will notice that we only had to use one line of code in order to accomplish our sort. This is one of the benefits of List<Type> and why it can be so efficient for all of your collection needs.
In the next example we will sort by the seating capacity of the Automobile.
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Display of the results of the Model sort [Fig. 1]:
[Click to see full-size]
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What have we learned?
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- Creating the Automobile class
- How to Populate the List
- How to sort the list by Model
Next Up
The next part in this series of articles will get into how we can utilize other methods in the List class.
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