Call same method using different datatype parameters without overloading

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.NET3.0

.NET3.5

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I want to call a method on two separate occasions. The two occasions pass two different types parameters, they differ by datatype. How do i achieve this without overloading.

This is my code

XML

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DifferentDatatypeOfMethods
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> intlist = new List<int>();
            intlist.Add(2);
            intlist.Add(3);
            intlist.Add(7);

            List<string> stringlist = new List<string>();
            stringlist.Add("A");
            stringlist.Add("B");
            stringlist.Add("C");

            Hit(intlist);
            Hit(stringlist);



            Console.Read();
        }

        public static void Hit(List<object> a) //doesn't work
        {
            Console.WriteLine(a[0]);
        }
    }
}

Posted 20-Mar-14 2:32am

Divakar Raj M

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5 solutions

Solution 4

Read here about variable data type in C# (it's there since Visual Studio 2008/C# 3.0)...
http://msdn.microsoft.com/en-us/library/bb383973(v=vs.120).aspx[^]

Posted 20-Mar-14 3:00am

Kornfeld Eliyahu Peter

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Matt T Heffron · Accepted Answer · 2014-03-20T07:38:00

Solution 5

Here's a start:

C#

public static void Hit(IList a)
{
    Console.WriteLine(a[0]);
}

Both of the types of Lists you're using implement the IList interface.
Without seeing what else you are doing I can't be sure, but using generics[^] looks like it may be a good solution.

Posted 20-Mar-14 7:38am

Matt T Heffron

BillWoodruff · Accepted Answer · 2014-03-20T07:49:00

The easy way:

C#

private void TestHit()
{
    var intlist = new List<int> {2, 3, 7};
    var stringlist = new List<string> {"A", "B", "C"};

    Hit(intlist);
    Hit(stringlist);
}

private void Hit<T1>(List<T1> theList)
{
    if (theList == null) throw new ArgumentNullException("theList");

    if (theList.Count == 0) throw new ArgumentOutOfRangeException("theList");

    Console.WriteLine(theList[0]);

}

The method 'Hit declares it uses one generic parameter by putting the place-holder name "T1" in angle-brackets after the method name. In the parameter list a generic List of whatever 'T1 will become at run-time, as the method is invoked, is defined. Using "T1" is a common convention, but you could use any non-reserved name for it; if you wanted to write:

C#

private void Hit<TypeToBeDetermined>(List<TypeToBeDetermined> theList);

That would be just fine, but ... verbose, indeed.

Tejas Vaishnav · Accepted Answer · 2014-03-20T02:59:00

Hi you can play like this...

C#

static void Main(string[] args)
        {
            List<int> intlist = new List<int>();
            intlist.Add(2);
            intlist.Add(3);
            intlist.Add(7);

            List<string> stringlist = new List<string>();
            stringlist.Add("A");
            stringlist.Add("B");
            stringlist.Add("C");

            Hit(intlist);
            Hit(stringlist);
            Console.Read();
        }

        public static void Hit(object a) //Its works!!
        {
            Type type = a.GetType();

            if (type == typeof(List<int>))
            {
                List<int> aa = a as List<int>;
                Console.WriteLine(aa[0]);
            }
            if (type == typeof(List<string>))
            {
                List<string> aa = a as List<string>;
                Console.WriteLine(aa[0]);
            }
        }

Divakar Raj M · Accepted Answer · 2014-03-20T02:59:00

Solved it..

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace DifferentDatatypeOfMethods
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> intlist = new List<int>();
            intlist.Add(2);
            intlist.Add(3);
            intlist.Add(7);

            List<string> stringlist = new List<string>();
            stringlist.Add("A");
            stringlist.Add("B");
            stringlist.Add("C");

            int user = Convert.ToInt32(Console.ReadLine());
            if(user > 5)
                Hit(intlist);
            else
                Hit(stringlist);
            
            Console.Read();
        }

        public static void Hit(object a)
        {

            List<object> intlist = new List<object>();

            List<int> int1 = null;
            List<string> string1 = null;
            int1 = a as List<int>;
            string1 = a as List<string>;

            if(int1 == null)
                foreach(var item in string1)
                Console.WriteLine(item);
            else
                foreach (var item in int1)
                    Console.WriteLine(item);
        }
       
    }
}

Call same method using different datatype parameters without overloading

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