10个C#程序员经常用到的实用代码片段

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); 

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; 
} 

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(“\tPrimary {0}”, screen.Primary); 
   Console.WriteLine(“\tBounds: {0}”, screen.Bounds); 
   Console.WriteLine(“\tWorking Area: {0}”,screen.WorkingArea); 
   Console.WriteLine(“\tBitsPerPixel: {0}”,screen.BitsPerPixel); 
} 

using (RegistryKey keyRun = Registry.LocalMachine.OpenSubKey(@”Software\Microsoft\Windows\CurrentVersion\Run”)) 
{ 
  foreach (string valueName in keyRun.GetValueNames()) 
  { 
   Console.WriteLine(“Name: {0}\tValue: {1}”, valueName, keyRun.GetValue(valueName)); 
  } 
} 

ServiceController controller = new ServiceController(“e-M-POWER”);   
controller.Start();   
if (controller.CanPauseAndContinue)   
{   
  controller.Pause();   
  controller.Continue();   
}   
controller.Stop(); 

if (args[0] == "/i") 
{ 
    ManagedInstallerClass.InstallHelper(new string[] { Assembly.GetExecutingAssembly().Location }); 
} 
else if (args[0] == "/u") 
{ 
  ManagedInstallerClass.InstallHelper(new string[] { "/u", Assembly.GetExecutingAssembly().Location }); 
} 

[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}\nForced: {1}", verified, !notForced); 

Microsoft.WindowsAPICodePack.Dialogs.CommonOpenFileDialog ofd = new Microsoft.WindowsAPICodePack.Dialogs.CommonOpenFileDialog(); 
ofd.AddToMostRecentlyUsedList = true; 
ofd.IsFolderPicker = true; 
ofd.AllowNonFileSystemItems = true; 
ofd.ShowDialog(); 

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); 

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 ); 

System.Diagnostics.Stopwatch timer = new System.Diagnostics.Stopwatch(); 
timer.Start(); 
Decimal total = 0; 
int limit = 1000000; 
for (int i = 0; i < limit; ++i) 
{ 
   total = total + (Decimal)Math.Sqrt(i); 
} 
timer.Stop(); 
Console.WriteLine(“Sum of sqrts: {0}”,total); 
Console.WriteLine(“Elapsed milliseconds: {0}”, 
timer.ElapsedMilliseconds); 
Console.WriteLine(“Elapsed time: {0}”, timer.Elapsed); 

class AutoStopwatch : System.Diagnostics.Stopwatch, IDisposable 
{ 
  public AutoStopwatch() 
  { 
    Start(); 
  } 
  public void Dispose() 
  { 
    Stop(); 
    Console.WriteLine(“Elapsed: {0}”, this.Elapsed); 
  } 
} 

using (new AutoStopwatch()) 
{ 
  Decimal total2 = 0; 
  int limit2 = 1000000; 
  for (int i = 0; i < limit2; ++i) 
  { 
    total2 = total2 + (Decimal)Math.Sqrt(i); 
  } 
} 

class AutoWaitCursor : IDisposable 
{ 
private Control _target; 
private Cursor _prevCursor = Cursors.Default; 
public AutoWaitCursor(Control control) 
{ 
  if (control == null) 
  { 
   throw new ArgumentNullException(“control”); 
  } 
  _target = control; 
  _prevCursor = _target.Cursor; 
  _target.Cursor = Cursors.WaitCursor; 
} 
public void Dispose() 
{ 
  _target.Cursor = _prevCursor; 
} 
} 

using (new AutoWaitCursor(this)) 
{ 
... 
throw new Exception(); 
}