How to call a method with valuetype . Its Urgetnt please

Hemalatha Sunnapu

7y904Learn iOS Programming

I have written a virtual method .

I want to call that method with a valuetype...

For ex:

int a=23;

String str=a.ToString(); //str=23;

Because ToString is a virtual method allows us to call with valutype.

12 Replies

Know the answer? Post it — somebody with the same question will find it here.

Sreekanth Reddy7y ago
Accepted answer
1) Int is a pre-defined class.
2)Add is our method which is written by us.

If you want our methods to be supported to the pre-defined classess we needs to to go with Extension Methods.

For knowing about Exension Methods :
http://www.tutorialsteacher.com/csharp/csharp-extension-method

Hope you understood the point.

If not getting come back with your query...

Thank you.
Jaish Mathews7y ago
If values are same, var v = i.Equals(obj); return true without any conversion and shouldn't use == operator here whenever Object used.
You should look deep in to difference between == operator and .Equals(). e.g. Ref https://coding.abel.nu/2014/09/net-and-equals/
Laxmidhar Sahoo7y ago
without extension can overrite
class Exts
   {
       public string Name { get; set; }
       public int Age { get; set; }

       public override string ToString()
       {
           return "Person: " + Name + " " + Age;
       }

   }
Hemalatha Sunnapu7y ago
public static class Ex
{
static bool res;
public static bool EqualsMethod(this int i, Object obj)
{
if((object)i==obj)
{
res=true;
}
else
{res = false;}
return res;
}
}

even though i value and obj are same it is giving false ???
Jaish Mathews7y ago
Yes, as told below, extension methods are the way. You want to know that rules to define extension methods are predefined in C# and to follow the rules as per document.

Here put 2 sample extension methods on int, one for double the value and another for adding with a value.
public static class IntExtension
    {
        public static int DoubleMe(this int x)
        {
            return 2 * x;
        }
        public static int Add(this int x, int y)
        {
            return x + y;
        }
    }
int i = 100;
int d = i.DoubleMe(); //200 will return
int s = i.Add(200); //300 will return
You call them like below.
Laxmidhar Sahoo7y ago
the tostring methos want to define in your calss
Hemalatha Sunnapu7y ago
helllo sahoo,
did u get my question
Laxmidhar Sahoo7y ago
string str = Convert.ToString(a);
Hemalatha Sunnapu7y ago
Ok, it works for struct, but i want to call it
int a=10;
a.Add();
which is not supportble by struct right.
Sreekanth Reddy7y ago
Struct is a value Type.
I think the struct one which I posted previously was the answer...
Please check it once.
Sreekanth Reddy7y ago
Exactly...
Are you expecting for reference type ?

Then take a class instead of struct...
Sreekanth Reddy7y ago
I think we needs to take the help of struct.
Because struct is a value type.

public struct Test
{
public void Add() { }
}

Create instance in another class and call the method.

public class Abc
{
Test obj = new Test();
obj.Add();
}

Hope this helps.

Mark as answer if it help. Else come up with a query.
Thank you.