toString参数说明

格式化数值：有时，我们可能需要将数值以一定的格式来呈现，就需要对数值进行格式化。我们使用格式字符串指定格式。格式字符串采用以下形式：Axx，其中 A 为格式说明符，指定格式化类型，xx 为精度说明符，控制格式化输出的有效位数或小数位数。

格式说明符	说明	示例	输出
C	货币	2.5.ToString("C")	￥2.50
D	十进制数	25.ToString("D5")	00025
E	科学型	25000.ToString("E")	2.500000E+005
F	固定点	25.ToString("F2")	25.00
G	常规	2.5.ToString("G")	2.5
N	数字	2500000.ToString("N")	2,500,000.00
X	十六进制	255.ToString("X")	FF

public class NumericFormats

{

public static void Main()

{

// Display string representations of numbers for en-us culture

CultureInfo ci = new CultureInfo("en-us");

// Output floating point values

double floating = 10761.937554; Console.WriteLine("C: {0}",

floating.ToString("C", ci)); // Displays "C: $10,761.94"

Console.WriteLine("E: {0}",

floating.ToString("E03", ci)); // Displays "E: 1.076E+004"

Console.WriteLine("F: {0}",

floating.ToString("F04", ci)); // Displays "F: 10761.9376"

Console.WriteLine("G: {0}",

floating.ToString("G", ci)); // Displays "G: 10761.937554"

Console.WriteLine("N: {0}",

floating.ToString("N03", ci)); // Displays "N: 10,761.938"

Console.WriteLine("P: {0}",

(floating/10000).ToString("P02", ci)); // Displays "P: 107.62 %"

Console.WriteLine("R: {0}",

floating.ToString("R", ci)); // Displays "R: 10761.937554"

Console.WriteLine();

// Output integral values

int integral = 8395;

Console.WriteLine("C: {0}",

integral.ToString("C", ci)); // Displays "C: $8,395.00"

Console.WriteLine("D: {0}",

integral.ToString("D6", ci)); // Displays D: 008395""

Console.WriteLine("E: {0}",

integral.ToString("E03", ci)); // Displays "E: 8.395E+003"

Console.WriteLine("F: {0}",

integral.ToString("F01", ci)); // Displays "F: 8395.0"

Console.WriteLine("G: {0}",

integral.ToString("G", ci)); // Displays "G: 8395"

Console.WriteLine("N: {0}",

integral.ToString("N01", ci)); // Displays "N: 8,395.0"

Console.WriteLine("P: {0}",

(integral/10000).ToString("P02", ci)); // Displays "P: 83.95 %"

Console.WriteLine("X: 0x{0}",

integral.ToString("X", ci)); // Displays "X: 0x20CB"

Console.WriteLine();

}

}