C#中格式化方法ToString("...")

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最新推荐文章于 2024-01-29 13:28:01 发布

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分类专栏： C# ASP.NET 文章标签： c# numbers string output c

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本文展示了C#中数值和日期格式化的应用，包括使用多种格式化选项来展示数字和日期时间，并详细介绍了字符串的转换方法。

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C# 
double[] numbers= {1054.32179, -195489100.8377, 1.0437E21, 
                   -1.0573e-05};
string[] specifiers = { "C", "E", "e", "F", "G", "N", "P", 
                        "R", "#,000.000", "0.###E-000"};
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();
}
// The example displays the following output to the console:
//       Formatting of 1054.32179:
//              C: $1,054.32
//              E: 1.054322E+003
//              e: 1.054322e+003
//              F: 1054.32
//              G: 1054.32179
//              N: 1,054.32
//              P: 105,432.18 %
//              R: 1054.32179
//          #,000.000: 1,054.322
//          0.###E-000: 1.054E003
//       
//       Formatting of -195489100.8377:
//              C: ($195,489,100.84)
//              E: -1.954891E+008
//              e: -1.954891e+008
//              F: -195489100.84
//              G: -195489100.8377
//              N: -195,489,100.84
//              P: -19,548,910,083.77 %
//              R: -195489100.8377
//          #,000.000: -195,489,100.838
//          0.###E-000: -1.955E008
//       
//       Formatting of 1.0437E+21:
//              C: $1,043,700,000,000,000,000,000.00
//              E: 1.043700E+021
//              e: 1.043700e+021
//              F: 1043700000000000000000.00
//              G: 1.0437E+21
//              N: 1,043,700,000,000,000,000,000.00
//              P: 104,370,000,000,000,000,000,000.00 %
//              R: 1.0437E+21
//          #,000.000: 1,043,700,000,000,000,000,000.000
//          0.###E-000: 1.044E021
//       
//       Formatting of -1.0573E-05:
//              C: $0.00
//              E: -1.057300E-005
//              e: -1.057300e-005
//              F: 0.00
//              G: -1.0573E-05
//              N: 0.00
//              P: 0.00 %
//              R: -1.0573E-05
//          #,000.000: 000.000
//          0.###E-000: -1.057E-005         //2007-4-24   
  
    this.TextBox7.Text = System.DateTime.Now.ToString("d");   
  
  
  
    //2007年4月24日 16:30:15   
  
    this.TextBox8.Text = System.DateTime.Now.ToString("F");   
  
    //2007年4月24日 16:30   
  
    this.TextBox9.Text = System.DateTime.Now.ToString("f");   
  
  
  
    //2007-4-24 16:30:15   
  
    this.TextBox10.Text = System.DateTime.Now.ToString("G");   
  
    //2007-4-24 16:30   
  
    this.TextBox11.Text = System.DateTime.Now.ToString("g");   
  
  
  
    //16:30:15   
  
    this.TextBox12.Text = System.DateTime.Now.ToString("T");   
  
    //16:30   
  
    this.TextBox13.Text = System.DateTime.Now.ToString("t");   
  
  
  
    //2007年4月24日 8:30:15   
  
    this.TextBox14.Text = System.DateTime.Now.ToString("U");   
  
    //2007-04-24 16:30:15Z   
  
    this.TextBox15.Text = System.DateTime.Now.ToString("u");   
  
  
  
    //4月24日   
  
    this.TextBox16.Text = System.DateTime.Now.ToString("m");   
  
    this.TextBox16.Text = System.DateTime.Now.ToString("M");   
  
    //Tue, 24 Apr 2007 16:30:15 GMT   
  
    this.TextBox17.Text = System.DateTime.Now.ToString("r");   
  
    this.TextBox17.Text = System.DateTime.Now.ToString("R");   
  
    //2007年4月   
  
    this.TextBox19.Text = System.DateTime.Now.ToString("y");   
  
    this.TextBox19.Text = System.DateTime.Now.ToString("Y");   
  
    //2007-04-24T15:52:19.1562500+08:00   
  
    this.TextBox20.Text = System.DateTime.Now.ToString("o");   
  
    this.TextBox20.Text = System.DateTime.Now.ToString("O");   
  
    //2007-04-24T16:30:15   
  
    this.TextBox18.Text = System.DateTime.Now.ToString("s");   
  
    //2007-04-24 15:52:19   
  
    this.TextBox21.Text = System.DateTime.Now.ToString("yyyy-MM-dd HH：mm：ss：ffff");   
  
    //2007年04月24 15时56分48秒   
  
    this.TextBox22.Text = System.DateTime.Now.ToString("yyyy年MM月dd HH时mm分ss秒");   
  
  
  
  
  
    //星期二, 四月 24 2007   
  
    this.TextBox1.Text = System.DateTime.Now.ToString("dddd, MMMM dd yyyy");   
  
    //二, 四月 24 '07   
  
    this.TextBox2.Text = System.DateTime.Now.ToString("ddd, MMM d \"'\"yy");   
  
    //星期二, 四月 24   
  
    this.TextBox3.Text = System.DateTime.Now.ToString("dddd, MMMM dd");   
  
    //4-07   
  
    this.TextBox4.Text = System.DateTime.Now.ToString("M/yy");   
  
    //24-04-07   
  
    this.TextBox5.Text = System.DateTime.Now.ToString("dd-MM-yy");   
  
  
  
字符型转换 转为字符串   
  
    12345.ToString("n"); //生成 12,345.00   
  
    12345.ToString("C"); //生成 ￥12,345.00   
  
    12345.ToString("e"); //生成 1.234500e+004   
  
    12345.ToString("f4"); //生成 12345.0000   
  
    12345.ToString("x"); //生成 3039 (16进制)   
  
    12345.ToString("p"); //生成 1,234,500.00%