What's wrong with casting 0.0 to double?

Question

I have InvalidCastException when I try to cast 0.0 to double, why is that so? It\'s fine when I do (float)value instead.

Answer 1

That's normal. If the object type is float you cannot cast it to double because they are not of the same type:

object o = 1.0f;
double d = (double)o; // will throw an exception

You need to convert it:

double d = Convert.ToDouble(o);