April 2007 - Posts

• Hashtable 元素顺序问题

  今天用 Hashtable 时发现结果的顺序并非为元素 Add 的顺序. 后改用ListDictionary 得以解决. 请见如下 code     using System.Collections;             static Hashtable _period;                  static frmMain()             {               _period = new Hashtable();               _period.Add("Month", 12);               _period.Add("Quarter", 4);               _period.Add("Half Year", 2);               _period.Add("Full Year", 1);                 ICollection period_type = _period.Keys;               foreach (string s in period_type)               {                    Console.WriteLine(s);               }             }       output     --------     Month     Half Year     Full Year     Quarter   using System.Collections.Specialized; static ListDictionary _period;                  static frmMain()             {               _period = new ListDictionary();               _period.Add("Month", 12);               _period.Add("Quarter", 4);               _period.Add("Half Year", 2);               _period.Add("Full Year", 1);                 ICollection period_type = _period.Keys;               foreach (string s in period_type)               {                    Console.WriteLine(s);               }             }       output     --------     Month     Quarter     Half Year     Full Year   Posted Apr 17 2007, 05:55 PM by wego with no comments

• C# 日期全球化

  今天用 CultureInfo 结合 ToString("MMM")  硬是不能取得英文月份表示 (如: Mar) , 而是中文 '三月'    (本人OS为中文版本).                          CultureInfo info = new CultureInfo("en-US", false);             Calendar calendar = info.Calendar;             DateTime t = new DateTime(year, month, day, calendar);             return t.ToString("MMM") + " " + t.Year.ToString();    // return '三月 2007'      兜了几个圈子, 后改用 DateTimeFormatInfo class 才得以解决.              DateTimeFormatInfo myDTFI = new CultureInfo( "en-US", false ).DateTimeFormat;             DateTime t = new DateTime(year, month, day);             return myDTFI.GetAbbreviatedMonthName(t.Month) + " " + t.Year.ToString();    // return 'Mar 2007'      令外,  DateTimeFormatInfo class 还有好多实用转换方法.  如:                myDTFI.GetDayName(t.DayOfWeek) --> Thursday   Posted Apr 06 2007, 05:44 PM by wego with no comments