分裂浮动

Question

I have a float = 1.30452F

For my WPF UI, I need to split the float into three parts :

• Part 1 : 1.30
• Part 2 : 45
• Part 3 : 2

A working solution is :

float myFloat = 1.30452F;

string part1 = myFloat.ToString("0.00");
string part2 = myFloat.ToString().Substring(4,2);
string part3 = myFloat.ToString().Substring(6);

Does anyone has a more performant and elegant way of splitting a float ?

Answer 1

A slight improvement (though using the same method) would reduce your string operations. I ran your original code 1 million times and did a timer on it and it was ~890ms. This change drops that down to 328ms. A decent improvement.

string myString = myFloat.ToString();
string part1 = myString.Substring(0, 4);
string part2 = myString.Substring(4, 2);
string part3 = myString.Substring(6);

I assume though that you want more than just the first 4 characters for part1. Here's a math version. This one runs in 31ms instead.

float part1 = (int)(myFloat * 100F) / 100F;
int part2 = (int)((myFloat - part1) * 10000F);
int part3 = (int)((myFloat - part1 - (part2 / 10000F)) * 100000);