核心提示：方法一：double number = 0.00009;string numberFromToString = number.ToString('0.' + new string('#', 339))...
方法一：
double number = 0.00009;
string numberFromToString = number.ToString("0." + new string('#', 339));//0.00009
方法二：number = 100.00009;
numberFromToString = number.ToString("0.#####"); //100.00009
numberFromToString = number.ToString("0.##########"); //100.00009
