Introduction détaillée à 10 extraits de code pratiques fréquemment utilisés par les programmeurs C#

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));
    }
}

<p style="margin-bottom: 7px;">ServiceController controller = new ServiceController(“e-M-POWER”);      <br/>controller.Start();      <br/>if (controller.CanPauseAndContinue)      <br/>{      <br/>    controller.Pause();      <br/>    controller.Continue();      <br/>}      <br/>controller.Stop();<br/></p>

 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);

Before allocations: 651,064
After allocations: 40,690,080

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();
}