C＃中的双重类型解析错误

Question

this is my code and i get this error: "Input string was not in a correct format."

var variable1= double.Parse("0.03".ToString(CultureInfo.InvariantCulture));

but for this code i didn't get error:

var variable1= double.Parse("0.03",CultureInfo.InvariantCulture);

what's the reason?

Answer 1

"0.03".ToString(CultureInfo.InvariantCulture)

evaluates to "0.03"

Looking at this expression in isolation you can see that something is wrong. Why are you calling ToString() on a string? Calling ToString() on a string simply returns the original string.

Anyway, moving on. Your function call is therefore the same as

double.Parse("0.03")

And that probably results in an error because your local decimal separator is not "." .

You meant to write

double.Parse("0.03", CultureInfo.InvariantCulture)

Answer 2

You can use

double.Parse("0.03", CultureInfo.InvariantCulture)

Double.Parse Method (String, NumberStyles)