Fastest Way for Converting an Object to Double?

Question

What is the fastest way to convert an object to a double? I'm at a piece of code right now, which reads:

var d = double.TryParse(o.ToString(), out d);  // o is the Object...

First thoughts were to rewrite this as

var d = Convert.ToDouble(o);

but would that actually be faster?

EDIT: In addition to running the profile (by the way, I strongly recommend JetBrains dotTrace to any developer), I ran Reflector, and that helped me to come up with the following (more or less the relevant portion of the code):

if (o is IConvertible)
{
    d = ((IConvertible)o).ToDouble(null);
}
else
{
    d = 0d;
}

The original code double.TryParse() executed in 140ms. The new code executes in 34ms. I'm almost certain that this is the optimization path I should take, but before I do that, does anyone see anything problematic with my "optimized" code? Thanks in advance for your feedback!

Answer 1

You must be doing a whole whopping lot of these in order to make any sense to spend any time on this. However, I am not here to judge:

So, your code is this:

if (o is IConvertible)
{
    d = ((IConvertible)o).ToDouble(null);
}
else
{
    d = 0d;
}

I wonder if you would be better off with this

IConvertible convert = o as IConvertible;

if (convert != null)
{
  d = convert.ToDouble(null);
}
else
{
  d = 0d;
}

Saves you the double cast.