How to use the generic extension for generic array method in C#

Question

0.00/5 (No votes)

See more:

Hi, I am trying to create my own class like a list generic class provided my microsoft.

below is my code:

namespace OwnGenricClass
{
    class Program
    {
        static void Main(string[] args)
        {
            Owngeneric<int> _test = new Owngeneric<int>();
            _test.addvalue(12);
            _test.addvalue(13);
            _test.addvalue(14);
            _test.addvalue(15);
            _test.addvalue(16);
            _test.extnlenght(); //showing error
            
        }
    }

    public class Owngeneric<T>
    {
        int i = 0;

        public T[] _data = new T[1];

        public void addvalue(T value)
        {
            _data[i] = value;
            i++;
            Array.Resize(ref _data, _data.Length + 1);
        }
    }

    public static class ExtensionMethodsClass
    {
        public static int extnlenght<T>(this T[] entity)
        {            
            return entity.Count();
        }
    }
}

What I have tried:

I want to get the length of the my generic type array from the extension method.

I have created but when I am going to use it showing compile time error, Its not able to recognize on the bases of type.

Posted 9-Jul-18 21:09pm

Bhanu Pratap Verma

Updated 10-Jul-18 0:03am

Add a Solution

3 solutions

Solution 1

Have a read of this great answer: c# - Why isn't Array a generic type? - Stack Overflow[^]

You would be better off working with List<T> for collections. Here is a starter: Collections tutorial - C# local quickstarts | Microsoft Docs[^]

Posted 9-Jul-18 21:40pm

Graeme_Grant

Comments

Bhanu Pratap Verma 10-Jul-18 3:56am

Can you guide me to how to correct code above?

Graeme_Grant 10-Jul-18 4:22am

Click on the link to the Microsoft Docs and it will answer your questions...

Solution 3

Hi,
The above code suggestion work for me.

Thank you for you response guys, Its really appreciated.

Posted 10-Jul-18 0:03am

Bhanu Pratap Verma

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

F-ES Sitecore · Accepted Answer · 2018-07-09T22:23:00

Your extension is acting on the type Owngeneric<t> so that's what needs to be your "this"

public static int extnlenght<T>(this Owngeneric<T> entity)
{
    return entity.Count; // We also need to create the Count property
}

Next your custom class needs a way of returning the count of the items it holds, so you need to implement that too;

public class Owngeneric<T>
{
    int i = 0;

    public T[] _data = new T[1];

    public void addvalue(T value)
    {
        _data[i] = value;
        i++;
        Array.Resize(ref _data, _data.Length + 1);
    }

    public int Count
    {
        get
        {
            return _data.Length;
        }
    }
}