Answered explicit cast vs Convert.to()

[Matthieu]

Hi!

Can someone explain me the difference between:

class Program
    {
        static void Main(string[] args)
        {
            int number = 10;
            double dNumber = System.Convert.ToDouble(number);
           
        }
    }

And:

class Program
    {
        static void Main(string[] args)
        {
            int number = 10;
            double dNumber = (double) number;

        }
    }

Both instructions give the same output.

Thank you very much!

Greetings!

 

[NoUserHere]

Please read this Difference between casting and using the Convert.To() method - I'm sure it will help you to choose which is best.
When you are done there, you can read up on Casting and type conversions - C# Programming Guide
Basically if you care not to be precise, use a cast. If you want to convert from a another type such as a string which is a non numerical type, then convert would be best used.

 

[JohnH]

There's also difference when unboxing:

int number = 10;
object boxednumber = number;

var dNumber = (double)boxednumber;

var dNumber = (double)(int)boxednumber;

var dNumber = System.Convert.ToDouble(boxednumber);

 

[NoUserHere]

Yep. @JohnH if you have time, you should also do an explicit example without var as this may also be better for the OP to understand.

 

[JohnH]

Those are all double conversions.