C# 实用代码段

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace notifyIconShow
{
 public partial class notifyIconShow : Form
 {
  public notifyIconShow()
  {
   InitializeComponent();
  }
  #region//设置鼠标放在托盘图标上面的文字
  /// <summary>
  /// 方法名称：notifyIconShow_Load(窗体加载事件)
  /// 方法作用：设置鼠标放在托盘图标上面的文字
  /// 完成日期：2010年5月16日
  /// 作者：心语
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void notifyIconShow_Load(object sender, EventArgs e)
  {
   //设置鼠标放在托盘图标上面的文字
   this.notifyIcon1.Text = "心语托盘图标";
  }
  #endregion
  #region//创建对象及声明变量
  //创建NotifyIcon对象
  NotifyIcon notifyicon = new NotifyIcon();
  //创建托盘图标对象
  Icon ico = new Icon("Clock2.ico");
  //创建托盘菜单对象
  ContextMenu notifyContextMenu = new ContextMenu();
  #endregion
  #region//隐藏任务栏图标，显示托盘图标
  /// <summary>
  /// 方法名称：notifyIconShow_SizeChanged(窗体大小改变后事件)
  /// 方法作用：隐藏任务栏图标，显示托盘图标
  /// 完成日期：2010年5月16日
  /// 作者：心语
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void notifyIconShow_SizeChanged(object sender, EventArgs e)
  {
   //判断是否选择的是最小化按钮
   if (WindowState == FormWindowState.Minimized)
   {
    //托盘显示图标等于托盘图标对象
    //注意notifyIcon1是控件的名字而不是对象的名字
    notifyIcon1.Icon = ico;
    //隐藏任务栏区图标
    this.ShowInTaskbar = false;
    //图标显示在托盘区
    notifyicon.Visible = true;
   }
  }
  #endregion
  #region//还原窗体
  /// <summary>
  /// 方法名称：notifyIcon1_Click（托盘图标单击）
  /// 方法作用：还原窗体
  /// 完成日期：2010年5月16日
  /// 作者：心语
  /// </summary>
  /// <param name="sender"></param>
  /// <param name="e"></param>
  private void notifyIcon1_Click(object sender, EventArgs e)
  {
   //判断是否已经最小化于托盘
   if (WindowState == FormWindowState.Minimized)
   {
    //还原窗体显示
    WindowState = FormWindowState.Normal;
    //激活窗体并给予它焦点
    this.Activate();
    //任务栏区显示图标
    this.ShowInTaskbar = true;
    //托盘区图标隐藏
    notifyicon.Visible = false;
   }
  }
  #endregion
 }
}

class Program
{
  static void Main(string[] args)
  {
   int n = m(20, 15);
   System.Console.WriteLine("最小公倍数为:" + n.ToString());
   System.Console.Read();
  }
  static int f(int a, int b)//最大公约数 
  {
   if (a < b) { a = a + b; b = a - b; a = a - b; }
   return (a % b == 0) ? b : f(a % b, b);
  }
  static int m(int a, int b)//最小公倍数 
  {
   return a * b / f(a, b);
  }
}

/// <summary> 
/// 把汉字转换成拼音(全拼) 
/// </summary> 
/// <param name="hzString">汉字字符串</param> 
/// <returns>转换后的拼音(全拼)字符串</returns> 
public static string ConvertE(string hzString)
{
 // 匹配中文字符 
 Regex regex = new Regex("^[u4e00-u9fa5]$");
 byte[] array = new byte[2];
 string pyString = "";
 int chrAsc = 0;
 int i1 = 0;
 int i2 = 0;
 char[] noWChar = hzString.ToCharArray();
 for (int j = 0; j < noWChar.Length; j++)
 {
  // 中文字符 
  if (regex.IsMatch(noWChar[j].ToString()))
  {
   array = System.Text.Encoding.Default.GetBytes(noWChar[j].ToString());
   i1 = (short)(array[0]);
   i2 = (short)(array[1]);
   chrAsc = i1 * 256 + i2 - 65536;
   if (chrAsc > 0 && chrAsc < 160)
   {
    pyString += noWChar[j];
   }
   else
   {
    // 修正部分文字 
    if (chrAsc == -9254) // 修正“圳”字 
     pyString += "Zhen";
    else
    {
     for (int i = (pyValue.Length - 1); i >= 0; i--)
     {
      if (pyValue[i] <= chrAsc)
      {
       pyString += pyName[i];
       break;
      }
     }
    }
   }
  }
  // 非中文字符 
  else
  {
   pyString += noWChar[j].ToString();
  }
 }
 return pyString;
}
private static int[] pyValue = new int[] 
{ 
 -20319,-20317,-20304,-20295,-20292,-20283,-20265,-20257,-20242,-20230,-20051,-20036, 
 -20032,-20026,-20002,-19990,-19986,-19982,-19976,-19805,-19784,-19775,-19774,-19763, 
 -19756,-19751,-19746,-19741,-19739,-19728,-19725,-19715,-19540,-19531,-19525,-19515, 
 -19500,-19484,-19479,-19467,-19289,-19288,-19281,-19275,-19270,-19263,-19261,-19249, 
 -19243,-19242,-19238,-19235,-19227,-19224,-19218,-19212,-19038,-19023,-19018,-19006, 
 -19003,-18996,-18977,-18961,-18952,-18783,-18774,-18773,-18763,-18756,-18741,-18735, 
 -18731,-18722,-18710,-18697,-18696,-18526,-18518,-18501,-18490,-18478,-18463,-18448, 
 -18447,-18446,-18239,-18237,-18231,-18220,-18211,-18201,-18184,-18183, -18181,-18012, 
 -17997,-17988,-17970,-17964,-17961,-17950,-17947,-17931,-17928,-17922,-17759,-17752, 
 -17733,-17730,-17721,-17703,-17701,-17697,-17692,-17683,-17676,-17496,-17487,-17482, 
 -17468,-17454,-17433,-17427,-17417,-17202,-17185,-16983,-16970,-16942,-16915,-16733, 
 -16708,-16706,-16689,-16664,-16657,-16647,-16474,-16470,-16465,-16459,-16452,-16448, 
 -16433,-16429,-16427,-16423,-16419,-16412,-16407,-16403,-16401,-16393,-16220,-16216, 
 -16212,-16205,-16202,-16187,-16180,-16171,-16169,-16158,-16155,-15959,-15958,-15944, 
 -15933,-15920,-15915,-15903,-15889,-15878,-15707,-15701,-15681,-15667,-15661,-15659, 
 -15652,-15640,-15631,-15625,-15454,-15448,-15436,-15435,-15419,-15416,-15408,-15394, 
 -15385,-15377,-15375,-15369,-15363,-15362,-15183,-15180,-15165,-15158,-15153,-15150, 
 -15149,-15144,-15143,-15141,-15140,-15139,-15128,-15121,-15119,-15117,-15110,-15109, 
 -14941,-14937,-14933,-14930,-14929,-14928,-14926,-14922,-14921,-14914,-14908,-14902, 
 -14894,-14889,-14882,-14873,-14871,-14857,-14678,-14674,-14670,-14668,-14663,-14654, 
 -14645,-14630,-14594,-14429,-14407,-14399,-14384,-14379,-14368,-14355,-14353,-14345, 
 -14170,-14159,-14151,-14149,-14145,-14140,-14137,-14135,-14125,-14123,-14122,-14112, 
 -14109,-14099,-14097,-14094,-14092,-14090,-14087,-14083,-13917,-13914,-13910,-13907, 
 -13906,-13905,-13896,-13894,-13878,-13870,-13859,-13847,-13831,-13658,-13611,-13601, 
 -13406,-13404,-13400,-13398,-13395,-13391,-13387,-13383,-13367,-13359,-13356,-13343, 
 -13340,-13329,-13326,-13318,-13147,-13138,-13120,-13107,-13096,-13095,-13091,-13076, 
 -13068,-13063,-13060,-12888,-12875,-12871,-12860,-12858,-12852,-12849,-12838,-12831, 
 -12829,-12812,-12802,-12607,-12597,-12594,-12585,-12556,-12359,-12346,-12320,-12300, 
 -12120,-12099,-12089,-12074,-12067,-12058,-12039,-11867,-11861,-11847,-11831,-11798, 
 -11781,-11604,-11589,-11536,-11358,-11340,-11339,-11324,-11303,-11097,-11077,-11067, 
 -11055,-11052,-11045,-11041,-11038,-11024,-11020,-11019,-11018,-11014,-10838,-10832, 
 -10815,-10800,-10790,-10780,-10764,-10587,-10544,-10533,-10519,-10331,-10329,-10328, 
 -10322,-10315,-10309,-10307,-10296,-10281,-10274,-10270,-10262,-10260,-10256,-10254 
};
private static string[] pyName = new string[] 
{ 
 "A","Ai","An","Ang","Ao","Ba","Bai","Ban","Bang","Bao","Bei","Ben", 
 "Beng","Bi","Bian","Biao","Bie","Bin","Bing","Bo","Bu","Ba","Cai","Can", 
 "Cang","Cao","Ce","Ceng","Cha","Chai","Chan","Chang","Chao","Che","Chen","Cheng", 
 "Chi","Chong","Chou","Chu","Chuai","Chuan","Chuang","Chui","Chun","Chuo","Ci","Cong", 
 "Cou","Cu","Cuan","Cui","Cun","Cuo","Da","Dai","Dan","Dang","Dao","De", 
 "Deng","Di","Dian","Diao","Die","Ding","Diu","Dong","Dou","Du","Duan","Dui", 
 "Dun","Duo","E","En","Er","Fa","Fan","Fang","Fei","Fen","Feng","Fo", 
 "Fou","Fu","Ga","Gai","Gan","Gang","Gao","Ge","Gei","Gen","Geng","Gong", 
 "Gou","Gu","Gua","Guai","Guan","Guang","Gui","Gun","Guo","Ha","Hai","Han", 
 "Hang","Hao","He","Hei","Hen","Heng","Hong","Hou","Hu","Hua","Huai","Huan", 
 "Huang","Hui","Hun","Huo","Ji","Jia","Jian","Jiang","Jiao","Jie","Jin","Jing", 
 "Jiong","Jiu","Ju","Juan","Jue","Jun","Ka","Kai","Kan","Kang","Kao","Ke", 
 "Ken","Keng","Kong","Kou","Ku","Kua","Kuai","Kuan","Kuang","Kui","Kun","Kuo", 
 "La","Lai","Lan","Lang","Lao","Le","Lei","Leng","Li","Lia","Lian","Liang", 
 "Liao","Lie","Lin","Ling","Liu","Long","Lou","Lu","Lv","Luan","Lue","Lun", 
 "Luo","Ma","Mai","Man","Mang","Mao","Me","Mei","Men","Meng","Mi","Mian", 
 "Miao","Mie","Min","Ming","Miu","Mo","Mou","Mu","Na","Nai","Nan","Nang", 
 "Nao","Ne","Nei","Nen","Neng","Ni","Nian","Niang","Niao","Nie","Nin","Ning", 
 "Niu","Nong","Nu","Nv","Nuan","Nue","Nuo","O","Ou","Pa","Pai","Pan", 
 "Pang","Pao","Pei","Pen","Peng","Pi","Pian","Piao","Pie","Pin","Ping","Po", 
 "Pu","Qi","Qia","Qian","Qiang","Qiao","Qie","Qin","Qing","Qiong","Qiu","Qu", 
 "Quan","Que","Qun","Ran","Rang","Rao","Re","Ren","Reng","Ri","Rong","Rou", 
 "Ru","Ruan","Rui","Run","Ruo","Sa","Sai","San","Sang","Sao","Se","Sen", 
 "Seng","Sha","Shai","Shan","Shang","Shao","She","Shen","Sheng","Shi","Shou","Shu", 
 "Shua","Shuai","Shuan","Shuang","Shui","Shun","Shuo","Si","Song","Sou","Su","Suan", 
 "Sui","Sun","Suo","Ta","Tai","Tan","Tang","Tao","Te","Teng","Ti","Tian", 
 "Tiao","Tie","Ting","Tong","Tou","Tu","Tuan","Tui","Tun","Tuo","Wa","Wai", 
 "Wan","Wang","Wei","Wen","Weng","Wo","Wu","Xi","Xia","Xian","Xiang","Xiao", 
 "Xie","Xin","Xing","Xiong","Xiu","Xu","Xuan","Xue","Xun","Ya","Yan","Yang", 
 "Yao","Ye","Yi","Yin","Ying","Yo","Yong","You","Yu","Yuan","Yue","Yun", 
 "Za", "Zai","Zan","Zang","Zao","Ze","Zei","Zen","Zeng","Zha","Zhai","Zhan", 
 "Zhang","Zhao","Zhe","Zhen","Zheng","Zhi","Zhong","Zhou","Zhu","Zhua","Zhuai","Zhuan", 
 "Zhuang","Zhui","Zhun","Zhuo","Zi","Zong","Zou","Zu","Zuan","Zui","Zun","Zuo"
};

//导入该命名空间
using System.Diagnostice;
Stopwatch watch=new Stopwatch ();
watch.Start();
/*
此处为要计算的运行代码
*/
watch.Stop();
//获取当前实例测量得出的总运行时间（以毫秒为单位）
string time = watch.ElapsedMilliseconds.ToString();

protected void Page_Load(object sender, EventArgs e)
{
    int m = System.DateTime.Today.Month;
    int y = System.DateTime.Today.Year;
    int d = System.DateTime.Today.Day;
    int weeks = getWeekDay(y, m, d);
    switch (weeks)
    {
      case 1:
        this.TextBox1.Text = "星期一";
        break;
      case 2:
        this.TextBox1.Text = "星期二";
        break;
      case 3:
        this.TextBox1.Text = "星期三";
        break;
      case 4:
        this.TextBox1.Text = "星期四";
        break;
      case 5:
        this.TextBox1.Text = "星期五";
        break;
      case 6:
        this.TextBox1.Text = "星期六";
        break;
      case 7:
        this.TextBox1.Text = "星期日";
        break;
    }
}
/// <summary>根据日期，获得星期几</summary>
/// <param name="y">年</param>
/// <param name="m">月</param>
/// <param name="d">日</param>
/// <returns>星期几，1代表星期一；7代表星期日</returns>
public static int getWeekDay(int y, int m, int d)
{
    if (m == 1) m = 13;
    if (m == 2) m = 14;
    int week = (d + 2 * m + 3 * (m + 1) / 5 + y + y / 4 - y / 100 + y / 400) % 7 + 1;
    return week;
}

/// <summary>
/// C# 删除文件夹
/// 用法： DeleteFolder(@"c:\1");
/// </summary>
/// <param name="dir"></param>
private static void DeleteFolder(string dir)
{
  // 循环文件夹里面的内容
  foreach (string f in Directory.GetFileSystemEntries(dir))
  {
  // 如果是文件存在
  if (File.Exists(f))
  {
  FileInfo fi = new FileInfo(f);
  if (fi.Attributes.ToString().IndexOf("Readonly") != 1)
  {
  fi.Attributes = FileAttributes.Normal;
  }
  // 直接删除其中的文件
  File.Delete(f);
  }
  else
  {
  // 如果是文件夹存在
  // 递归删除子文件夹
  DeleteFolder(f);
  }
  }
  // 删除已空文件夹
  Directory.Delete(dir);
}

OperatingSystem os = System.Environment.OSVersion; 
Console.WriteLine(“Platform: {0}”, os.Platform); 
Console.WriteLine(“Service Pack: {0}”, os.ServicePack); 
Console.WriteLine(“Version: {0}”, os.Version); 
Console.WriteLine(“VersionString: {0}”, os.VersionString); 
Console.WriteLine(“CLR Version: {0}”, System.Environment.Version); 
 
//在我的Windows 7系统中，输出以下信息
Platform: Win32NT 
 Service Pack: 
 Version: 6.1.7600.0 
 VersionString: Microsoft Windows NT 6.1.7600.0 
 CLR Version: 4.0.21006.1 

//可以通过Windows Management Instrumentation (WMI)提供的接口读取所需要的信息。
private static UInt32 CountPhysicalProcessors() 
{ 
   ManagementObjectSearcher objects = new ManagementObjectSearcher( 
    “SELECT * FROM Win32_ComputerSystem”); 
   ManagementObjectCollection coll = objects.Get(); 
   foreach(ManagementObject obj in coll) 
  { 
    return (UInt32)obj[“NumberOfProcessors”]; 
  } 
  return 0; 
} 
private static UInt64 CountPhysicalMemory() 
{ 
  ManagementObjectSearcher objects =new ManagementObjectSearcher( 
   “SELECT * FROM Win32_PhysicalMemory”); 
  ManagementObjectCollection coll = objects.Get(); 
  UInt64 total = 0; 
  foreach (ManagementObject obj in coll) 
  { 
    total += (UInt64)obj[“Capacity”]; 
  } 
  return total; 
} 

//请添加对程序集System.Management的引用，确保代码可以正确编译。
Console.WriteLine(“Machine: {0}”, Environment.MachineName); 
Console.WriteLine(“# of processors (logical): {0}”, Environment.ProcessorCount); 
Console.WriteLine(“# of processors (physical): {0}” CountPhysicalProcessors()); 
Console.WriteLine(“RAM installed: {0:N0} bytes”, CountPhysicalMemory()); 
Console.WriteLine(“Is OS 64-bit? {0}”,  Environment.Is64BitOperatingSystem); 
Console.WriteLine(“Is process 64-bit? {0}”, Environment.Is64BitProcess); 
Console.WriteLine(“Little-endian: {0}”, BitConverter.IsLittleEndian); 
foreach (Screen screen in System.Windows.Forms.Screen.AllScreens) 
{ 
   Console.WriteLine(“Screen {0}”, screen.DeviceName); 
   Console.WriteLine(“	Primary {0}”, screen.Primary); 
   Console.WriteLine(“	Bounds: {0}”, screen.Bounds); 
   Console.WriteLine(“	Working Area: {0}”,screen.WorkingArea); 
   Console.WriteLine(“	BitsPerPixel: {0}”,screen.BitsPerPixel); 
}