How to create Template Class / Generic in C#

Many people confuse between Template Class and Generic. There are the same to me.

There is a very good example in msdn https://msdn.microsoft.com/en-us/library/0x6a29h6.aspx but it is still lacking of some details.

The article created a nice template GenericList<T>.

    public class GenericList<T>

    {

        // The nested class is also generic on T.

        private class Node

        {

            // T used in non-generic constructor.

            public Node(T t)

            {

                next = null;

                data = t;

            }

 

            private Node next;

            public Node Next

            {

                get { return next; }

                set { next = value; }

            }

 

            // T as private member data type.

            private T data;

 

            // T as return type of property.

            public T Data

            {

                get { return data; }

                set { data = value; }

            }

        }

 

        private Node head;

 

        // constructor

        public GenericList()

        {

            head = null;

        }

 

        // T as method parameter type:

        public void AddHead(T t)

        {

            Node n = new Node(t);

            n.Next = head;

            head = n;

        }

 

        public IEnumerator<T> GetEnumerator()

        {

            Node current = head;

 

            while (current != null)

            {

                yield return current.Data;

                current = current.Next;

            }

        }

    }

Somehow in the main program they only use integer. I have added the string data type to make the sample more obvious.

class TestGenericList

{

    static void Main()

    {

        // int is the type argument

        GenericList<int> list = new GenericList<int>();

 

        for (int x = 0; x < 10; x++)

        {

            list.AddHead(x);

        }

 

        foreach (int i in list)

        {

            System.Console.Write(i + ” “);

        }

        System.Console.WriteLine(\nDone”);

 

        GenericList<string> listString = new GenericList<string>();

 

        for (int x = 0; x < 10; x++)

        {

            listString.AddHead(x.ToString());

        }

 

        foreach (string i in listString)

        {

            System.Console.Write(i + ” “);

        }

        System.Console.WriteLine(\nDone”);

    }

}

You can also download a single solution from http://skydrive.live.com. The sample file name is ComAppTemplate.zip My MSN ID is chanmmn@hotmail.com.

About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress (http://www.pcworld.com/article/206455/Microsoft_Live_Spaces_Moves_to_WordPress_An_FAQ.html) till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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