将double转换为字符串，保持格式 - C＃

Question

Hi all. I have a double number (Ex: 0.000006). I want convert it to string type. But result is "6E-06". I dont want it, i want 0.000006".Thanks you so much

double a = 0.000006; 
string resultString = a.toString();

I don't know many number after "." character

Answer 1

It's simple that if you want to show a number as exactly as what it looks, we can cast it to decimal and use the default ToString() like this:

var s = ((decimal)yourNumber).ToString();
//if yourNumber = 0.00000000000000000000000006
//just append the M after it:
var s = (0.00000000000000000000000006M).ToString();

Answer 2

Please check this article and find the format which suits your needs: http://www.csharp-examples.net/string-format-double/

Looks like this one is good enough:

String.Format("{0:0.00}", 123.4567); 

Answer 3

Use String.Format() with the format specifier .

double a = 0.000006;
string formatted = String.Format("{0:F6}", a);

Answer 4

Try with the Roundtrip 'R' format specifier :

double a = 0.000006;
string resultString = a.ToString("R"); 

Answer 5

            Double Rate_USD = Convert.ToDouble(txtRateUsd.Text);
            string Rate_USD = txtRateUsd.Text;