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();
   }
}