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