C#数字格式

usingSystem;

classFormattingNumbers
{
staticvoidMain()
{
decimaltheDecNumber=12345.678m;//the"m"createsaliteraloftypedecimalfromadouble
//UsingtheToStringMethod
//thenumberintheformatstringistheprecisionspecifier
Console.WriteLine("Noformatting:"+theDecNumber.ToString());
Console.WriteLine("Currencyformatting:"+theDecNumber.ToString("C"));
Console.WriteLine("Exponentialformatting:"+theDecNumber.ToString("E"));
Console.WriteLine("Fixed-pointformatting:"+theDecNumber.ToString("F2"));
Console.WriteLine("Generalformatting:"+theDecNumber.ToString("G"));
Console.WriteLine("Numberformattingto2decimalplaces:"+theDecNumber.ToString("N2"));
Console.WriteLine("Numberformattingto3decimalplaces:"+theDecNumber.ToString("N3"));
Console.WriteLine("Numberformattingto4decimalplaces:"+theDecNumber.ToString("N4"));
Console.WriteLine("Percentformatting:"+theDecNumber.ToString("P0"));

inttheIntNumber=123456;
Console.WriteLine("Hexidecimalformatting(forintegers):{0}={1}",theIntNumber,theIntNumber.ToString("X"));

doubletheDblNumber=1234567890;
Console.WriteLine("Customformatting:{0}toUStelephone{1}",theDblNumber,theDblNumber.ToString("(###)###-####"));

//Keepconsoleopenifnotrunthroughcommandprompt
Console.Write("/nPressEntertoContinue");
Console.ReadLine();
}
}
N2表示小数点后保留2位....