格式说明符汇总

 

.NET Framework 定义了标准和自定义格式说明符，用于设置数字、日期和时间以及枚举的格式。

格式说明符由下列方法使用：

设置输出字符串格式的各种方法（例如 Console. . :: . WriteLine ）、某些类型的 ToString 方法的个别重载、某些分析输入字符串的方法（例如 Parse 和 DateTime. . :: . ParseExact ）

 

1:数字格式化

/* *标准数字格式字符串: *标准数字格式字符串用于格式化通用数值类型。标准数字格式字符串采用 Axx 的形式， *其中 A 是称为格式说明符的字母型字符，xx 是称为精度说明符的可选整数。 *精度说明符的范围从 0 到 99，并且影响结果中的位数。 *任何包含一个以上字母字符（包括空白）的数字格式字符串都被解释为自定义数字格式字符串 */ public void StandardNumberFormatStr() { //货币 C/c double value = 12345.6789; Console.WriteLine(value.ToString("C", CultureInfo.InvariantCulture));//12,345.68 Console.WriteLine(value.ToString("C3", CultureInfo.InvariantCulture));//12,345.679 Console.WriteLine(value.ToString("C3", CultureInfo.CreateSpecificCulture("en-US")));//$12,345.679 //十进制数 D/d value = 12345; Console.WriteLine(value.ToString("D"));// 12345 Console.WriteLine(value.ToString("D8")); // 00012345 value = -12345; Console.WriteLine(value.ToString("D"));// -12345 Console.WriteLine(value.ToString("D8"));// -00012345 //科学记数法（指数） E/e value = 12345.6789; Console.WriteLine(value.ToString("E", CultureInfo.InvariantCulture));// 1.234568E+004 Console.WriteLine(value.ToString("E10", CultureInfo.InvariantCulture));// 1.2345678900E+004 Console.WriteLine(value.ToString("e4", CultureInfo.InvariantCulture));// 1.2346e+004 Console.WriteLine(value.ToString("E", CultureInfo.CreateSpecificCulture("fr-FR"))); // 1,234568E+004 //定点 F/f int integerNumber; integerNumber = 17843; Console.WriteLine(integerNumber.ToString("F", CultureInfo.InvariantCulture));// 17843.00 integerNumber = -29541; Console.WriteLine(integerNumber.ToString("F3", CultureInfo.InvariantCulture));// -29541.000 double doubleNumber; doubleNumber = 18934.1879; Console.WriteLine(doubleNumber.ToString("F", CultureInfo.InvariantCulture)); // 18934.19 Console.WriteLine(doubleNumber.ToString("F0", CultureInfo.InvariantCulture)); // 18934 doubleNumber = -1898300.1987; Console.WriteLine(doubleNumber.ToString("F1", CultureInfo.InvariantCulture)); // -1898300.2 Console.WriteLine(doubleNumber.ToString("F3",CultureInfo.CreateSpecificCulture("es-ES"))); // -1898300,199 //常规 G/g double number; number = 12345.6789; Console.WriteLine(number.ToString("G", CultureInfo.InvariantCulture)); // 12345.6789 Console.WriteLine(number.ToString("G",CultureInfo.CreateSpecificCulture("fr-FR")));// 12345,6789 Console.WriteLine(number.ToString("G7", CultureInfo.InvariantCulture));// 12345.68 number = .0000023; Console.WriteLine(number.ToString("G", CultureInfo.InvariantCulture)); // 2.3E-06 Console.WriteLine(number.ToString("G", CultureInfo.CreateSpecificCulture("fr-FR")));// 2,3E-06 number = .0023; Console.WriteLine(number.ToString("G", CultureInfo.InvariantCulture));// 0.0023 number = 1234; Console.WriteLine(number.ToString("G2", CultureInfo.InvariantCulture));// 1.2E+03 number = Math.PI; Console.WriteLine(number.ToString("G5", CultureInfo.InvariantCulture)); // 3.1416 //数字 N/n double dblValue = -12445.6789; Console.WriteLine(dblValue.ToString("N", CultureInfo.InvariantCulture));// -12,445.68 Console.WriteLine(dblValue.ToString("N1", CultureInfo.CreateSpecificCulture("sv-SE"))); // -12445,7 int intValue = 123456789; Console.WriteLine(intValue.ToString("N1", CultureInfo.InvariantCulture));// 123,456,789.0 //百分比 P/p number = .2468013; Console.WriteLine(number.ToString("P", CultureInfo.InvariantCulture)); // 24.68 % Console.WriteLine(number.ToString("P",CultureInfo.CreateSpecificCulture("hr-HR"))); // 24,68% Console.WriteLine(number.ToString("P1", CultureInfo.InvariantCulture));// Displays 24.7 % //十六进制数 X/x value = 0x2045e; Console.WriteLine(value.ToString("x")); // Displays 2045e Console.WriteLine(value.ToString("X"));// Displays 2045E Console.WriteLine(value.ToString("X8")); // Displays 0002045E value = 123456789; Console.WriteLine(value.ToString("X")); // Displays 75BCD15 Console.WriteLine(value.ToString("X2"));// Displays 75BCD15 } /* * 自定义数字格式字符串: * 由一个或多个自定义数字格式说明符组成，用于定义格式化数值数据的方式 */ public void CustomNumberFormatStr() { double value; //零占位符 0 value = 123; Console.WriteLine(value.ToString("00000")); // 00123 value = 1.2; Console.WriteLine(value.ToString("0.00", CultureInfo.InvariantCulture));// 1.20 Console.WriteLine(value.ToString("00.00", CultureInfo.InvariantCulture));// 01.20 Console.WriteLine(value.ToString("00.00", CultureInfo.CreateSpecificCulture("da-DK"))); // 01,20 value = .56; Console.WriteLine(value.ToString("0.0", CultureInfo.InvariantCulture));// 0.6 //数字占位符 # value = 1234567890; Console.WriteLine(value.ToString("#,#", CultureInfo.InvariantCulture));// 1,234,567,890 Console.WriteLine(value.ToString("#,#",CultureInfo.CreateSpecificCulture("el-GR")));// 1.234.567.890 value = 1.2; Console.WriteLine(value.ToString("#.##", CultureInfo.InvariantCulture)); // 1.2 value = 123; Console.WriteLine(value.ToString("#####"));// 123 value = 123456; Console.WriteLine(value.ToString("[##-##-##]")); // [12-34-56] value = 1234567890; Console.WriteLine(value.ToString("#"));// 1234567890 Console.WriteLine(value.ToString("(###) ###-####"));// (123) 456-7890 //小数点 . value = 1.2; Console.WriteLine(value.ToString("0.00", CultureInfo.InvariantCulture));// 1.20 Console.WriteLine(value.ToString("00.00", CultureInfo.InvariantCulture)); // 01.20 Console.WriteLine(value.ToString("00.00", CultureInfo.CreateSpecificCulture("da-DK"))); // 01,20 value = .086; Console.WriteLine(value.ToString("#0.##%", CultureInfo.InvariantCulture));// 8.6% value = 86000; Console.WriteLine(value.ToString("0.###E+0", CultureInfo.InvariantCulture));// 8.6E+4 //千位分隔符和数字比例换算 , value = 1234567890; Console.WriteLine(value.ToString("#,#", CultureInfo.InvariantCulture)); // 1,234,567,890 Console.WriteLine(value.ToString("#,##0,,", CultureInfo.InvariantCulture)); // 1,235 value = 1234567890; Console.WriteLine(value.ToString("#,,", CultureInfo.InvariantCulture)); // 1235 Console.WriteLine(value.ToString("#,,,", CultureInfo.InvariantCulture));// 1 Console.WriteLine(value.ToString("#,##0,,", CultureInfo.InvariantCulture));// 1,235 //百分比占位符 % value = .086; Console.WriteLine(value.ToString("#0.##%", CultureInfo.InvariantCulture)); // 8.6% //科学记数法 E0 E+0 E-0 e0 e+0 e-0 value = 86000; Console.WriteLine(value.ToString("0.###E+0", CultureInfo.InvariantCulture));// 8.6E+4 Console.WriteLine(value.ToString("0.###E+000", CultureInfo.InvariantCulture)); // 8.6E+004 Console.WriteLine(value.ToString("0.###E-000", CultureInfo.InvariantCulture));// 8.6E004 }

2:日期格式化

//标准日期和时间格式字符串 public void DateFormatDemo() { //yyyy'-'MM'-'dd HH':'mm':'ss'Z' //yyyy'-'MM'-'dd'T'HH':'mm':'ss DateTime date1 = DateTime.Now; Response.Write(date1.ToString("yyyy.MM.dd"));//2008.04.10 Response.Write(date1.ToString("d", CultureInfo.InvariantCulture));//04/10/2008 Response.Write(date1.ToString("d", CultureInfo.CreateSpecificCulture("zh-CN")));//2008-04-10 Response.Write(date1.ToString("D", CultureInfo.CreateSpecificCulture("zh-CN")));//2008年4月10日星期四 Response.Write(date1.ToString("f", CultureInfo.CreateSpecificCulture("zh-CN")));//2010年1月7日星期四 16:29 Response.Write(date1.ToString("F", CultureInfo.CreateSpecificCulture("zh-CN")));//2010年1月7日星期四 16:30:39 Response.Write(date1.ToString("g", CultureInfo.CreateSpecificCulture("zh-CN")));//2010-1-7 16:37 Response.Write(date1.ToString("G", CultureInfo.CreateSpecificCulture("zh-CN")));//2010-1-7 16:37:37 Response.Write(date1.ToString("t", CultureInfo.InvariantCulture));//16:42 Response.Write(date1.ToString("y", CultureInfo.CreateSpecificCulture("zh-CN")));//2010年1月 Response.Write(date1.ToString("T", CultureInfo.CreateSpecificCulture("zh-CN")));//16:43:16 Response.Write(date1.ToString("yyyy-MM-dd HH:mm:ss"));//2010-1-7 16:59:09 Response.Write(date1.ToString("yy-M-d H:m:s"));//10-1-7 9:17:9 Console.WriteLine(date1.ToString("hh:mm:ss.ff tt", CultureInfo.InvariantCulture)); // Displays 06:09:01.50 PM Response.Write(date1.ToString("yy-MM-dd hh:mm:ss.ff tt", CultureInfo.InvariantCulture));//10-01-07 05:07:29.59 PM Response.Write(date1.ToString("f", CultureInfo.InvariantCulture));//Thursday, 07 January 2010 16:29 Response.Write(date1.ToString("F", CultureInfo.InvariantCulture));//Thursday, 07 January 2010 16:30:39 Response.Write(date1.ToString("D", CultureInfo.InvariantCulture));//Thursday, 10 April 2010 Response.Write(date1.ToString("g", CultureInfo.InvariantCulture));//01/07/2010 16:37 Response.Write(date1.ToString("G", CultureInfo.InvariantCulture));//01/07/2010 16:37:37 Response.Write(date1.ToString("m", CultureInfo.InvariantCulture));//January 07 Response.Write(date1.ToString("o", CultureInfo.CreateSpecificCulture("zh-CN")));//2010-01-07T16:41:38.7968750+08:00 Response.Write(date1.ToString("r", CultureInfo.InvariantCulture));//Thu, 07 Jan 2010 16:41:59 GMT Response.Write(date1.ToString("s", CultureInfo.CreateSpecificCulture("zh-CN")));//2010-01-07T16:42:42 Response.Write(date1.ToString("u", CultureInfo.InvariantCulture));//2010-01-07 16:43:31Z CultureInfo ci = CultureInfo.InvariantCulture; Console.WriteLine(date1.ToString("hh:mm:ss.f", ci)); // Displays 07:27:15.0 Console.WriteLine(date1.ToString("hh:mm:ss.F", ci)); // Displays 07:27:15 Console.WriteLine(date1.ToString("hh:mm:ss.ff", ci));// Displays 07:27:15.01 Console.WriteLine(date1.ToString("hh:mm:ss.FF", ci));// Displays 07:27:15.01 Console.WriteLine(date1.ToString("hh:mm:ss.fff", ci));// Displays 07:27:15.018 Console.WriteLine(date1.ToString("hh:mm:ss.FFF", ci));// Displays 07:27:15.018 }