String.Format举例，C#

stringstr1 =string.Format("{0:N1}",56789); //result: 56,789.0

stringstr2 =string.Format("{0:N2}",56789); //result: 56,789.00

stringstr3 =string.Format("{0:N3}",56789); //result: 56,789.000

stringstr8 =string.Format("{0:F1}",56789); //result: 56789.0

stringstr9 =string.Format("{0:F2}",56789); //result: 56789.00

stringstr11 =(56789 / 100.0).ToString("#.##"); //result: 567.89

stringstr12 =(56789 / 100).ToString("#.##"); //result: 567

C 或 c

货币

Console.Write("{0:C}", 2.5); //$2.50

Console.Write("{0:C}", -2.5); //($2.50)

D 或 d

十进制数

Console.Write("{0:D5}", 25); //00025

E 或 e

科学型

Console.Write("{0:E}", 250000); //2.500000E+005

F 或 f

固定点

Console.Write("{0:F2}", 25); //25.00

Console.Write("{0:F0}", 25); //25

G 或 g

常规

Console.Write("{0:G}", 2.5); //2.5

N 或 n

数字

Console.Write("{0:N}", 2500000); //2,500,000.00

X 或 x

十六进制

Console.Write("{0:X}", 250); //FA

Console.Write("{0:X}", 0xffff); //FFFF