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[转载]C# ToString格式字符串整理(Format)(数字、日期和枚举的标准格式设置说明符)(SamWang) – SamWang – 博客园.
日常开发中，格式字符串的情况非常多。经常也会忘记，经常去查有些麻烦，所以今天就花点时间做个整理。
格式字符串用的比较多的有数字、日期与枚举的格式化。
一、数字格式字符串
| C或c | 本地货币格式 |
| D或d | 十进制格式，把整数转换为以10为基数的书，如果给定一个精度说明符，就加上前导0 |
| E或e | 科学计数法（指数）格式，精度说明符设置小数位数（默认为6），格式字符串的大小写（e或E)确定指数符号的大小写。 |
| F或f | 固定点格式，精度说明符设置小数位数，可以为0 |
| G或g | 普通格式，使用E或F格式取决于哪种格式较简单 |
| N或n | 数字格式，用逗号表示千分符，例如32,767.44 |
| P或p | 百分数格式 |
| X或x | 十六进制格式，精度说明符用于加上前导0 |
先用例子说明几种格式字符串的方法：
double d = 123.456;Console.WriteLine("ToString:{0}", d.ToString("C"));Console.WriteLine("Format:{0}", string.Format("{0:C}",d));Console.WriteLine("Console:{0:C}", d); |
输出结果：
数字格式化程序例子：
Console.WriteLine("十六进制格式符X：{0}", (145).ToString("X"));//X只支持整型double[] numbers = {1054.32179, -195489100.8377, 1.0437E21,-1.0573e-05};string[] specifiers = { "C", "E", "F", "G", "N","P","R","#,000.000", "0.###E-000","000,000,000,000.00###" };foreach (double number in numbers){Console.WriteLine("Formatting of {0}:", number);foreach (string specifier in specifiers){Console.WriteLine(" {0,5}: {1}",specifier, number.ToString(specifier));}Console.WriteLine();} |
输出结果：
二、日期格式字符串
static void DateToString(){DateTime dateValue = DateTime.Now;// Create an array of standard format strings.string[] standardFmts = {"d", "D", "f", "F", "g", "G", "m", "o","R", "s", "t", "T", "u", "U", "y"};// Output date and time using each standard format string.foreach (string standardFmt in standardFmts)Console.WriteLine("{0}: {1}", standardFmt,dateValue.ToString(standardFmt));Console.WriteLine();// Create an array of some custom format strings.string[] customFmts = {"yyyyMMddHHmmss","h:mm:ss.ff t", "d MMM yyyy", "HH:mm:ss.f","dd MMM HH:mm:ss", @"\Mon\t\h\: M", "HH:mm:ss.ffffzzz" };// Output date and time using each custom format string.foreach (string customFmt in customFmts)Console.WriteLine("'{0}': {1}", customFmt,dateValue.ToString(customFmt));} |
输出结果：
MSDN:DateTime.ToString 方法 (String)
三、枚举格式字符串
enum Colors { Red, Green, Blue, Yellow = 12 };static void EnumToString(){Colors myColor = Colors.Yellow;Console.WriteLine("Colors.Red = {0}", Colors.Red.ToString("d"));Console.WriteLine("Colors.Green = {0}", Colors.Green.ToString("d"));Console.WriteLine("Colors.Blue = {0}", Colors.Blue.ToString("d"));Console.WriteLine("Colors.Yellow = {0}", Colors.Yellow.ToString("d"));Console.WriteLine("{0}myColor = Colors.Yellow{0}", Environment.NewLine);Console.WriteLine("myColor.ToString(\"g\") = {0}", myColor.ToString("g"));Console.WriteLine("myColor.ToString(\"G\") = {0}", myColor.ToString("G"));Console.WriteLine("myColor.ToString(\"x\") = {0}", myColor.ToString("x"));Console.WriteLine("myColor.ToString(\"X\") = {0}", myColor.ToString("X"));Console.WriteLine("myColor.ToString(\"d\") = {0}", myColor.ToString("d"));Console.WriteLine("myColor.ToString(\"D\") = {0}", myColor.ToString("D"));Console.WriteLine("myColor.ToString(\"f\") = {0}", myColor.ToString("f"));Console.WriteLine("myColor.ToString(\"F\") = {0}", myColor.ToString("F"));} |
输出结果：
