c# 格式化数字 ToString方法使用总结

decimal a11 = 100100.01m;
decimal a12 = 100100.51m;
decimal a13 = 100100.50m;
decimal a14 = 100100.00m;
decimal a15 = 100100.55m;
decimal a16 = 100100.54m;

Console.WriteLine("#.##输出");
Console.WriteLine(a11.ToString("#.##"));
Console.WriteLine(a12.ToString("#.##"));
Console.WriteLine(a13.ToString("#.##"));
Console.WriteLine(a14.ToString("#.##"));
Console.WriteLine(a15.ToString("#.##"));
Console.WriteLine(a16.ToString("#.##"));
Console.WriteLine("#.#输出");
Console.WriteLine(a11.ToString("#.#"));
Console.WriteLine(a12.ToString("#.#"));
Console.WriteLine(a13.ToString("#.#"));
Console.WriteLine(a14.ToString("#.#"));
Console.WriteLine(a15.ToString("#.#"));
Console.WriteLine(a16.ToString("#.#"));
Console.WriteLine("0.00输出");
Console.WriteLine(a11.ToString("0.00"));
Console.WriteLine(a12.ToString("0.00"));
Console.WriteLine(a13.ToString("0.00"));
Console.WriteLine(a14.ToString("0.00"));
Console.WriteLine(a15.ToString("0.00"));
Console.WriteLine(a16.ToString("0.00"));
Console.WriteLine("0.0输出");
Console.WriteLine(a12.ToString("0.0"));
Console.WriteLine(a11.ToString("0.0"));
Console.WriteLine(a13.ToString("0.0"));
Console.WriteLine(a14.ToString("0.0"));
Console.WriteLine(a15.ToString("0.0"));
Console.WriteLine(a16.ToString("0.0"));
Console.WriteLine("F输出");
Console.WriteLine(a11.ToString("F"));
Console.WriteLine(a14.ToString("F"));
Console.WriteLine(a12.ToString("F"));
Console.WriteLine(a13.ToString("F"));
Console.WriteLine(a15.ToString("F"));
Console.WriteLine(a16.ToString("F"));
Console.WriteLine("####输出");
Console.WriteLine(a11.ToString("####"));
Console.WriteLine(a12.ToString("####"));
Console.WriteLine(a13.ToString("####"));
Console.WriteLine(a14.ToString("####"));
Console.WriteLine(a15.ToString("####"));
Console.WriteLine(a16.ToString("####"));
Console.WriteLine("F1");
Console.WriteLine(a11.ToString("F1"));
Console.WriteLine(a12.ToString("F1"));
Console.WriteLine(a13.ToString("F1"));
Console.WriteLine(a14.ToString("F1"));
Console.WriteLine(a15.ToString("F1"));
Console.WriteLine(a16.ToString("F1"));
Console.WriteLine("N");
Console.WriteLine(a11.ToString("N"));
Console.WriteLine(a12.ToString("N"));
Console.WriteLine(a13.ToString("N"));
Console.WriteLine(a14.ToString("N"));
Console.WriteLine(a15.ToString("N"));
Console.WriteLine(a16.ToString("N"));
Console.WriteLine("##.00");
Console.WriteLine(a11.ToString("##.00"));
Console.WriteLine(a12.ToString("##.00"));
Console.WriteLine(a13.ToString("##.00"));
Console.WriteLine(a14.ToString("##.00"));
Console.WriteLine(a15.ToString("##.00"));
Console.WriteLine(a16.ToString("##.00"));
Console.WriteLine("C");
Console.WriteLine(a11.ToString("C"));
Console.WriteLine(a12.ToString("C"));
Console.WriteLine(a13.ToString("C"));
Console.WriteLine(a14.ToString("C"));
Console.WriteLine(a15.ToString("C"));
Console.WriteLine(a16.ToString("C"));

输出结果

#.##输出
100100.01
100100.51
100100.5
100100
100100.55
100100.54
#.#输出
100100
100100.5
100100.5
100100
100100.6
100100.5
0.00输出
100100.01
100100.51
100100.50
100100.00
100100.55
100100.54
0.0输出
100100.5
100100.0
100100.5
100100.0
100100.6
100100.5
F输出
100100.01
100100.00
100100.51
100100.50
100100.55
100100.54
####输出
100100
100101
100101
100100
100101
100101
F1
100100.0
100100.5
100100.5
100100.0
100100.6
100100.5
N
100,100.01
100,100.51
100,100.50
100,100.00
100,100.55
100,100.54
##.00
100100.01
100100.51
100100.50
100100.00
100100.55
100100.54
C
￥100,100.01
￥100,100.51
￥100,100.50
￥100,100.00
￥100,100.55
￥100,100.54

总结:

ToString("#.##"); 　　//保留两位小数，会四舍五入，结尾为0则会省略输出

ToString("#.#");　　//保留一位小数，会四舍五入，结尾为0则会省略输出

ToString("0.00");　　//保留两位小数，会四舍五入,使用保留两位小数,没有两位小数会填充0补位

ToString("0.0");　　//保留一位小数，会四舍五入,使用保留两位小数,没有小数会填充0补位

ToString("F");　　//保留两位小数，会四舍五入,使用保留两位小数,没有两位小数会填充0补位

ToString("####");　　//输出整数部分,会四舍五入

ToString("F1");　　// 保留一位小数，会四舍五入,使用保留两位小数,没有小数会填充0补位

ToString("N");　　// 保留两位小数，会四舍五入,使用保留两位小数,没有两位小数会填充0补位 ,整数部分每三位数一个[,]分隔符 例: 100,100.02

ToString("##.00");　　//保留两位小数，会四舍五入,使用保留两位小数,没有两位小数会填充0补位

ToString("C");　　// 输出部分会有人民币符号[¥],保留两位小数，会四舍五入,使用保留两位小数,没有两位小数会填充0补位,整数部分每三位数一个[,]分隔符  例:￥100,100.50

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