双科学计数格式第十次幂C＃

Question

I am having double value = 30308950000;

I want to display it like 3.03x10^10

How can I achieve it using C#?

I have tried

double value = 30308950000;
Console.WriteLine(value.ToString("0.###E+0", CultureInfo.InvariantCulture));

output = 3.03E+10

I dont want the 3.03E+10 format but 3.03x10^10 . Thanks

Answer 1

Easy fix:

double value = 30308950000;
Console.WriteLine(
    value.ToString("0.###E+0", CultureInfo.InvariantCulture)
        .Replace("E-","x10^-")
        .Replace("E+","x10^"));

Shout out to Jon Skeet! :)

Answer 2

Sadly, NumberFormarInfo doesn't provide any ExponentialSign parameter.

That it, the Exponential Format Specifier (E) use only NegativeSign, NumberDecimalSeparator and PositiveSign information from the NumberFormarInfo .

To do it "in the pattern" , you have to use your own implementation of ICustomFormatter like here .