How do I add integer and string array by using generics

Question

0.00/5 (No votes)

See more:

In the below code I want to perform the generics add of int array as well as add of string array.
so how to achieve this by using generics.

C#

class Program
    {
        static void Main(string[] args)
        {
            int[] x = new int[] { 10, 20, 30, 40 };
            string[] y = new string[] { "Himanshu", "Panjabi" };
            ArrayCalc<int> ac1 = new ArrayCalc<int>();
            int r1 = ac1.Add(x);

            Console.WriteLine(r1);
            //ArrayCalc<string> ac2=new ArrayCalc<string>();
            //string r2=ac2.Add(y);

            //int[] a = new int[] { 2, 4, 6, 8, 10 };
            //int res = a.Sum();
            //Console.WriteLine(res);
            Console.ReadLine();
        }
    }
    public class ArrayCalc<T> where T : IComparable
    {
        public T Add(T[] t1)
        {
            T t3 = default(T);
            if (t1 is int[])
            {
                int[] num = new int[10];
                int res = Convert.ToInt32(num.Sum());
                //int asum=num.Sum();
                //int num1 =Convert.ToInt32(t1);
                // int num2 = Convert.ToInt32(t2);
                //int res = num1;
                T files = (T)System.Convert.ChangeType(res, typeof(T));
                return files;
            }
            //else if (t1 is string)
            //{
            //    return (T)System.Convert.ChangeType(x, typeof(T));
            //}
            else
                return (T)System.Convert.ChangeType(t3, typeof(T));


        }

Posted 27-Apr-15 23:45pm

Member 11132163

Updated 28-Apr-15 0:06am

Andy Lanng

v2

Add a Solution

3 solutions

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)

Karthik_Mahalingam · Answer 1 · 2015-04-28T00:03:00

Solution 2

Try this

C#

public T Add(T[] t1)
       {
           T t3 = default(T);
           if (t1 is int[])
           {
               int[] temp = t1 as int[];
               int[] num = new int[10];
               var res = temp.Sum();

Posted 28-Apr-15 0:03am

Karthik_Mahalingam

Comments

Member 11132163 28-Apr-15 6:14am

Thank You for soling my first doubt
now my second doubt is how to perform add in string array??

Karthik_Mahalingam 28-Apr-15 6:16am

how will u add string values? does it make sense ?
add or concatenate ??
be specific in the question.
Thanks

Member 11132163 28-Apr-15 6:21am

sorry!!
I mean how to do concatenation of string values
so in the program I want the following type of output HimanshuPanjabi

Karthik_Mahalingam 28-Apr-15 7:42am

Sascha Lefévre solution has the rest of the answer. you can refer that.

Sascha Lefèvre · Answer 2 · 2015-04-28T00:44:00

First, I must tell you that your idea of that ArrayCalc-class isn't a good use for a generic class. The main benefit of generics is that you can use exactly the same code for various types. If you have to make a case-distinction in your code between different types to make it work, that benefit is lost. In those cases it makes much more sense to implement the logic separately per type.

However, just to show you how your class could be implemented, here's my take:

C#

using System;
using System.Linq;
					
public class Program
{
    public static void Main()
    {
        int[] integers = new int[] { 10, 20, 30, 40 };
        string[] strings = new string[] { "Himanshu", "Panjabi" };

        ArrayCalc<int> calcInt = new ArrayCalc<int>();
        int sum = calcInt.Add(integers);
        Console.WriteLine(sum);

        ArrayCalc<string> calcString = new ArrayCalc<string>();
        string joined = calcString.Add(strings);
        Console.WriteLine(joined);
    }

    public class ArrayCalc<T>
    {
        public T Add(T[] array)
        {
            if (array is int[])
            {
                int[] numbers = array as int[];
                int sum = numbers.Sum();
                return (T)(object)sum;       // <-- UGLY!
            }
            else if (array is string[])
            {
                string[] strings = array as string[];
                string joined = String.Join("", strings);
                return (T)(object)joined;    // <-- UGLY!
            }
            else
                throw new NotSupportedException("can't add " + typeof(T).Name);
        }
    }
}

Console-output:

100
HimanshuPanjabi

As indicated by "UGLY!", this mis-use (to be honest) of generics where you make case-distinctions based on the generic type also leads to neccessary ugly reverse-casts to the generic type T in order to be able to return the result without the compiler complaining about it.

Abhinav S · Answer 3 · 2015-04-27T23:59:00

An ArrayList does not support generics so you cannot create any ArrayList of a type for e.g. int or string.

Use List<t> instead.

For e.g. List<int> coll = new List<int>();

Here is a difference between both of them - http://www.aspsnippets.com/Articles/Difference-between-ArrayList-and-Generic-List-in-C-Net-and-VBNet.aspx[^].

How do I add integer and string array by using generics

3 solutions

Solution 2

Solution 3

Solution 1

Add your solution here

Preview 0