字符串到浮点vs双重转换

Question

Why is fvalue1 123456792 after the following line of code has executed?

float fvalue1 = Convert.ToSingle("123456789", CultureInfo.InvariantCulture);

Converting to double works as expected:

double dvalue1 = Convert.ToDouble("123456789", CultureInfo.InvariantCulture);

Answer 1

You've just discovered for yourself the reason double type exists - its precision is better then float's.

Check out following on the differences between these types: Difference between decimal, float and double in .NET?

Answer 2

float没有代表123456789的精度，而double则具有。