C＃十进制要翻倍？

Question

Why can't I use math.pow with numericUpDown value? When I use this code:

a = (numericUpDown1.Value);
b = (numericUpDown2.Value);
m = Math.Pow(a, b);

I receive the following error:

Severity Code Description Project File Line Suppression State
Error CS0266 Cannot implicitly convert type 'decimal' to 'double'. An explicit conversion exists (are you missing a cast?)  

Answer 1

This is because Math.Pow has only one overload - the one accepting two double s. Since you want to work with decimal s, you need to use explicit casts in both directions:

decimal m = (decimal)Math.Pow((double)a, (double)b);