C#中的String.Format

string str1 =string.Format("{0:N1}",56789);               //result: 56,789.0

string str2 =string.Format("{0:N2}",56789);               //result: 56,789.00

string str3 =string.Format("{0:N3}",56789);               //result: 56,789.000

string str8 =string.Format("{0:F1}",56789);               //result: 56789.0

string str9 =string.Format("{0:F2}",56789);               //result: 56789.00

string str11 =(56789 / 100.0).ToString("#.##");           //result: 567.89

string str12 =(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