Need a Help in C# Generics

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Friends,

Need a small help in writing one generic function that will take input value of two different type and return a value of another different type.

e.g public <t> Add<t,u,v>(U obj1, V obj2) where T:struct
{
}

Like sending a "int" and and "double" value and getting a "string" as output.Or Any combination of these basic types.

Please friends provide your valuable Ideas.

Thanking You

Posted 6-Jan-14 0:25am

somnath roy24

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phil.o 6-Jan-14 6:28am

And what did you try?
From the small sample you gave, we can see that you omitted the return type of the method.
Example:
public T Add<T,U,V>(U obj1, V obj2) where T:struct
{
}

Edit: if you want T to be string, then you cannot restrict it to a struct; strings are reference types.

somnath roy24 6-Jan-14 6:37am

If i ommit the struct part i am unable to cast the integer or the double value to string. Can u please help me how to cast. I want to have

public Add<t,u,v>(U obj1, V obj2)
{
T temp;
temp=obj1.toString()+obj2.toString();
return temp;
}

it will be combination of basic types

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Rob Philpott · Answer 1 · 2014-01-06T00:41:00

You can't do that - or not to those specifications. Sure you can add an int to a double and call ToString() on the result, but what if I pass an 'Exception' as the third parameter (or anything else which doesn't make sense)?

In order for generics to work, you need to constrain the generic parameters to a level where different acceptable types work the same way. A string is not compatible with int or double. It needs a special case 'ToString()' to make it work. How can you infer this needs doing in a generic manner for all types? You can't.

Perhaps your best bet would be to abandon Generics and just create a set of overloads for the different types you expect.