如果你是一个C#程序员,那么本文介绍的10个C#常用代码片段一定会给你带来帮助,从底层的资源操作,到上层的UI应用,这些代码也许能给你的开发节省不少时间。以下是原文:
  1 读取操作系统和CLR的版本
  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
  2 读取CPU数量,内存容量
  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);
  }
  3 读取注册表键值对
  using (RegistryKey keyRun = Registry.LocalMachine.OpenSubKey(@”SoftwareMicrosoftWindowsCurrentVersionRun”))
  {
  foreach (string valueName in keyRun.GetValueNames())
  {
  Console.WriteLine(“Name: {0} Value: {1}”, valueName, keyRun.GetValue(valueName));
  }
  }
  请添加命名空间Microsoft.Win32,以确保上面的代码可以编译。
  4 启动,停止Windows服务
  这项API提供的实用功能常常用来管理应用程序中的服务,而不必到控制面板的管理服务中进行操作。
  ServiceController controller = new ServiceController(“e-M-POWER”);     
  controller.Start();     
  if (controller.CanPauseAndContinue)     
  {     
  controller.Pause();     
  controller.Continue();     
  }     
  controller.Stop();
  .net提供的API中,可以实现一句话安装与卸载服务
  if (args[0] == "/i")
  {
  ManagedInstallerClass.InstallHelper(new string[] { Assembly.GetExecutingAssembly().Location });
  }
  else if (args[0] == "/u")
  {
  ManagedInstallerClass.InstallHelper(new string[] { "/u", Assembly.GetExecutingAssembly().Location });
  }
  如代码所示,给应用程序传入i或u参数,以表示是卸载或是安装程序。
  5 验证程序是否有strong name (P/Invoke)
  比如在程序中,为了验证程序集是否有签名,可调用如下方法
  [DllImport("mscoree.dll", CharSet=CharSet.Unicode)]
  static extern bool StrongNameSignatureVerificationEx(string wszFilePath, bool fForceVerification, ref bool pfWasVerified);
  bool notForced = false;
  bool verified = StrongNameSignatureVerificationEx(assembly, false, ref notForced);
  Console.WriteLine("Verified: {0} Forced: {1}", verified, !notForced);
  这个功能常用在软件保护方法,可用来验证签名的组件。即使你的签名被人去掉,或是所有程序集的签名都被去除,只要程序中有这一项调用代码,则可以停止程序运行。
  6 响应系统配置项的变更
  比如我们锁定系统后,如果QQ没有退出,则它会显示了忙碌状态。
  请添加命名空间Microsoft.Win32,然后对注册下面的事件。
  . DisplaySettingsChanged (包含Changing) 显示设置
  . InstalledFontsChanged 字体变化
  . PaletteChanged
  . PowerModeChanged 电源状态
  . SessionEnded (用户正在登出或是会话结束)
  . SessionSwitch (变更当前用户)
  . TimeChanged 时间改变
  . UserPreferenceChanged (用户偏号 包含Changing)
  我们的ERP系统,会监测系统时间是否改变,如果将时间调整后ERP许可文件之外的范围,会导致ERP软件不可用。
  7 运用Windows7的新特性
  Windows7系统引入一些新特性,比如打开文件对话框,状态栏可显示当前任务的进度。
  Microsoft.WindowsAPICodePack.Dialogs.CommonOpenFileDialog ofd = new Microsoft.WindowsAPICodePack.Dialogs.CommonOpenFileDialog();
  ofd.AddToMostRecentlyUsedList = true;
  ofd.IsFolderPicker = true;
  ofd.AllowNonFileSystemItems = true;
  ofd.ShowDialog();
  用这样的方法打开对话框,与BCL自带类库中的OpenFileDialog功能更多一些。不过只限于Windows 7系统中,所以要调用这段代码,还要检查操作系统的版本要大于6,并且添加对程序集Windows API Code Pack for Microsoft?.NET Framework的引用,请到这个地址下载 http://code.msdn.microsoft.com/WindowsAPICodePack
  8 检查程序对内存的消耗
  用下面的方法,可以检查.NET给程序分配的内存数量
  long available = GC.GetTotalMemory(false);
  Console.WriteLine(“Before allocations: {0:N0}”, available);
  int allocSize = 40000000;
  byte[] bigArray = new byte[allocSize];
  available = GC.GetTotalMemory(false);
  Console.WriteLine(“After allocations: {0:N0}”, available);
  在我的系统中,它运行的结果如下所示
  Before allocations: 651,064
  After allocations: 40,690,080
  使用下面的方法,可以检查当前应用程序占用的内存
  Process proc = Process.GetCurrentProcess();
  Console.WriteLine(“Process Info: “+Environment.NewLine+
  “Private Memory Size: {0:N0}”+Environment.NewLine +
  “Virtual Memory Size: {1:N0}” + Environment.NewLine +
  “Working Set Size: {2:N0}” + Environment.NewLine +
  “Paged Memory Size: {3:N0}” + Environment.NewLine +
  “Paged System Memory Size: {4:N0}” + Environment.NewLine +
  “Non-paged System Memory Size: {5:N0}” + Environment.NewLine,
  proc.PrivateMemorySize64,   proc.VirtualMemorySize64,  proc.WorkingSet64,  proc.PagedMemorySize64, proc.PagedSystemMemorySize64,  proc.NonpagedSystemMemorySize64 );