使用c#将科学记数法转换为长数？

Question

I need to convert 8.9148E+19 to numeric format using c#

I have already tried using Double.Parse(3.58E+14, System.Globalization.NumberStyles.Float) but it is rounded up the value, but not returned the actual number.

Answer 1

您应该使用Parse from decimal 。

var parsed = decimal.Parse("8.9148E+19", System.Globalization.NumberStyles.Float);

Answer 2

If you want to check and convert the exponent value use this:

//your value
string val = "8.9148E+19";     
//create a dummy
double dummy;
//check if ist valid
bool hasExponential = (val.Contains("E") || val.Contains("e")) && double.TryParse(val, out dummy);
if (hasExponential)
{
    //if it is valid parse it
    decimal d = decimal.Parse(val, NumberStyles.Float);
}