How Can I Create A Common Function For Adding String And Int In C# Using Generics

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How can i create a common function for adding string and int in C# using generics. Below code i am getting an error like operator + cannot be used with type T. When i used dynamics i am able to get an output. Is there any possible way with out dynamics ?

<private void="" eventargs="" mode="hold"> {
// for srting
string strResult = Add<string>("Hello", "Welcome");

//for int
int result = Add<int>(10, 15);
}

private T Add<T>(T arg1, T arg2)
{

return arg1 + arg2;
}

Posted 6-May-14 16:26pm

code4Better

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Dave Kreskowiak · Answer 1 · 2014-05-06T18:58:00

Solution 1

This doesn't make a lot of sense. There are far more types that you simply cannot "add" together, like most classes and structures. This only makes sense for numbers and strings.

There really is no advantage to what you're doing as the standard numerical addition operation is more flexible than what you're trying to do and "adding" strings together is already accomplished with String.Join[^].

Posted 6-May-14 18:58pm

Dave Kreskowiak

Comments

code4Better 8-May-14 20:51pm

i want to have a method where it can take arguments and their type will be decided in run time (i will provide the arguments only which can be added together)and returns the respective type. I dont want create same function which does same functionality for different types. That was the intention to write such a method. Do you have any idea how can we accomplish that funtion into working ??

Dave Kreskowiak 8-May-14 22:39pm

Frankly, that's a stupid idea. The only types you can add/append together are numerics and strings and those already have their respective support built in. The way you've written your code, you can only ever use a single type for both operands, making the code you're writing a moot point (see previous sentence).

code4Better 11-May-14 17:03pm

Hello Dave,
You dont need to tell me whether it is stupid idea or not. I am already able to achieve the result using dynamic. My question was with out using dynamic. If you dont the answer you just keep quiet or just go and read something and then comment.

Dave Kreskowiak 11-May-14 17:25pm

Have a nice life.

Bernhard Hiller · Answer 2 · 2014-05-06T20:25:00

Solution 2

You do not need any generics for that. The + operator is already overloaded for string and int:

C#

int i = 0;
string str = "";
string result = i + str;
string ret = str + i;

That compiles; i.ToString() is called somewhere in the background when the values are added.

Posted 6-May-14 20:25pm

Bernhard Hiller

Comments

code4Better 8-May-14 20:46pm

Hello Hiller,
Thanks for your time.
As you said we can add int and string together but i want to have a method where it can take arguments and their type will be decided in run time (i will provide the arguments only which can be added together)and returns the respective type. That was the intention to write such a method. Do you have any idea how can we accomplish that funtion into working ??

Bernhard Hiller 9-May-14 2:40am

When you use Generics with a "where" clause, all the conditions of the where clause are combined with a logical AND, not with a logical OR (at least upto .Net 4) - hence it is not possible to provide a list of acceptable types for the where clause.

code4Better 11-May-14 17:05pm

Thanks for your input Bernhard Hiller.