var srcImage = new Mat(@"..\..\Images\Test.jpg");
Cv2.ImShow("Source", srcImage);
Cv2.WaitKey(1); // do events
 
var grayImage = new Mat();
Cv2.CvtColor(srcImage, grayImage, ColorConversion.BgrToGray);
Cv2.EqualizeHist(grayImage, grayImage);

var cascade = new CascadeClassifier(@"..\..\Data\haarcascade_frontalface_alt.xml");
var nestedCascade = new CascadeClassifier(@"..\..\Data\haarcascade_eye_tree_eyeglasses.xml");
 
var faces = cascade.DetectMultiScale(
    image: grayImage,
    scaleFactor: 1.1,
    minNeighbors: 2,
    flags: HaarDetectionType.Zero | HaarDetectionType.ScaleImage,
    minSize: new Size(30, 30)
    );
 
Console.WriteLine("Detected faces: {0}", faces.Length);

var rnd = new Random();
var count = 1;
foreach (var faceRect in faces)
{
    var detectedFaceImage = new Mat(srcImage, faceRect);
    Cv2.ImShow(string.Format("Face {0}", count), detectedFaceImage);
    Cv2.WaitKey(1); // do events
 
    var color = Scalar.FromRgb(rnd.Next(0, 255), rnd.Next(0, 255), rnd.Next(0, 255));
    Cv2.Rectangle(srcImage, faceRect, color, 3);
  
    count++;
}
 
Cv2.ImShow("Haar Detection", srcImage);
Cv2.WaitKey(1); // do events

var rnd = new Random();
var count = 1;
foreach (var faceRect in faces)
{
    var detectedFaceImage = new Mat(srcImage, faceRect);
    Cv2.ImShow(string.Format("Face {0}", count), detectedFaceImage);
    Cv2.WaitKey(1); // do events
 
    var color = Scalar.FromRgb(rnd.Next(0, 255), rnd.Next(0, 255), rnd.Next(0, 255));
    Cv2.Rectangle(srcImage, faceRect, color, 3);
 
 
    var detectedFaceGrayImage = new Mat();
    Cv2.CvtColor(detectedFaceImage, detectedFaceGrayImage, ColorConversion.BgrToGray);
    var nestedObjects = nestedCascade.DetectMultiScale(
        image: detectedFaceGrayImage,
        scaleFactor: 1.1,
        minNeighbors: 2,
        flags: HaarDetectionType.Zero | HaarDetectionType.ScaleImage,
        minSize: new Size(30, 30)
        );
 
    Console.WriteLine("Nested Objects[{0}]: {1}", count, nestedObjects.Length);
 
    foreach (var nestedObject in nestedObjects)
    {
        var center = new Point
        {
            X = Cv.Round(nestedObject.X + nestedObject.Width * 0.5) + faceRect.Left,
            Y = Cv.Round(nestedObject.Y + nestedObject.Height * 0.5) + faceRect.Top
        };
        var radius = Cv.Round((nestedObject.Width + nestedObject.Height) * 0.25);
        Cv2.Circle(srcImage, center, radius, color, thickness: 3);
    }
 
    count++;
}
 
Cv2.ImShow("Haar Detection", srcImage);
Cv2.WaitKey(1); // do events

public class Book
    {
        private int code = 10;        

        public int GetCode()
        {
            return code;
        }
    }

public class Book
    {
        private readonly int code = 10;        

        public int GetCode()
        {
            return code = 20;
        }        
    }

using System.Reflection;

 public class Book
 {
        private int code = 10;
 }

 public class Program
 {
        static void Main( string[] args )
        {
            Book book = new Book();
            var codeField = book.GetType().GetField( "code", BindingFlags.NonPublic | BindingFlags.Instance );
            codeField.SetValue( book, 20 );
            var value = codeField.GetValue( book );
        }
    }

using System.Reflection;

 public class Book
 {
        private readonly int code = 10;
 }

 public class Program
 {
        static void Main( string[] args )
        {
            Book book = new Book();
            var codeField = book.GetType().GetField( "code", BindingFlags.NonPublic | BindingFlags.Instance );
            codeField.SetValue( book, 50);
            var value = codeField.GetValue( book );
        }
    }

using System;
using System.Linq;
using System.Collections.Generic;
using System.IO;
using System.Web.Mvc;

namespace SecurityModule
{
    [AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
    public sealed class AllowUploadSafeFilesAttribute : ActionFilterAttribute
    {
        static readonly IList<string> ExtToFilter = new List<string> { 
            ".aspx", ".asax", ".asp", ".ashx", ".asmx", ".axd", ".master", ".svc", ".php" ,        
            ".php3" , ".php4", ".ph3", ".ph4", ".php4", ".ph5", ".sphp", ".cfm", ".ps", ".stm",
            ".htaccess", ".htpasswd", ".php5", ".phtml", ".cgi", ".pl", ".plx", ".py", ".rb", ".sh", ".jsp",
            ".cshtml", ".vbhtml", ".swf" , ".xap", ".asptxt"
        };

        static readonly IList<string> NameToFilter = new List<string> { 
           "web.config" , "htaccess" , "htpasswd", "web~1.con"
        };

        static bool canUpload(string fileName)
        {
            if (string.IsNullOrWhiteSpace(fileName))
                return false;

            fileName = fileName.ToLowerInvariant();
            var name = Path.GetFileName(fileName);
            var ext = Path.GetExtension(fileName);

            if (string.IsNullOrWhiteSpace(name))
                throw new InvalidOperationException("Uploaded file should have a name.");

            return !ExtToFilter.Contains(ext) &&
                   !NameToFilter.Contains(name) &&
                   !NameToFilter.Contains(ext) &&
                   //for "file.asp;.jpg" files
                   ExtToFilter.All(item => !name.Contains(item));
        }

        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            var files = filterContext.HttpContext.Request.Files;
            foreach (string file in files)
            {
                var postedFile = files[file];
                if (postedFile == null || postedFile.ContentLength == 0) continue;

                if (!canUpload(postedFile.FileName))
                    throw new InvalidOperationException(string.Format("You are not allowed to upload {0} file.", Path.GetFileName(postedFile.FileName)));
            }

            base.OnActionExecuting(filterContext);
        }
    }
}

[AllowUploadSafeFiles]
public ActionResult UploadFile(HttpPostedFileBase file)

 PM> Install-Package PostSharp

using System;

namespace AOP03
{
    public class MyType
    {
        public void DoSomething(string data, int i)
        {
            Console.WriteLine("DoSomething({0}, {1});", data, i);
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            new MyType().DoSomething("Test", 1);
        }
    }
}

using System;
using PostSharp.Aspects;

namespace AOP03
{
    [Serializable]
    public class LoggingAspect : OnMethodBoundaryAspect
    {
        public override void OnEntry(MethodExecutionArgs args)
        {
            Console.WriteLine("On Entry");
        }

        public override void OnExit(MethodExecutionArgs args)
        {
            Console.WriteLine("On Exit");
        }

        public override void OnSuccess(MethodExecutionArgs args)
        {
            Console.WriteLine("On Success");
        }

        public override void OnException(MethodExecutionArgs args)
        {
            Console.WriteLine("On Exception");
        }
    }
}

    public class MyType
    {
        [LoggingAspect]
        public void DoSomething(string data, int i)
        {
            Console.WriteLine("DoSomething({0}, {1});", data, i);
        }
    }

 On Entry
DoSomething(Test, 1);
On Success
On Exit

public void DoSomething(string data, int i)
{
    <>z__Aspects.a0.OnEntry(null);
    try
    {
        Console.WriteLine("DoSomething({0}, {1});", data, i);
        <>z__Aspects.a0.OnSuccess(null);
    }
    catch (Exception)
    {
        <>z__Aspects.a0.OnException(null);
        throw;
    }
    finally
    {
        <>z__Aspects.a0.OnExit(null);
    }
}

 [Serializable]
[MulticastAttributeUsage(MulticastTargets.Method, TargetMemberAttributes = MulticastAttributes.Instance)]
public class LoggingAspect : OnMethodBoundaryAspect

 [assembly: LoggingAspect(AttributeTargetTypes = "AOP03.*")]

var numbers = new List<int> { -7, 1, 5, -6 };

var sortedNumbers1 = numbers.OrderBy(n => n);
var sortedNumbers2 = numbers.OrderByDescending(n => n);

public static IOrderedEnumerable<TSource> OrderBy<TSource,TKey>(
   [NotNull] this IEnumerable<TSource> source,
   [NotNull] Func<TSource,TKey> keySelector)

var sortedNumbers3 = numbers.Order();
var sortedNumbers4 = numbers.OrderDescending();

public static IOrderedEnumerable<T> Order<T>(this IEnumerable<T> source)
public static IOrderedEnumerable<T> OrderDescending<T>(this IEnumerable<T> source)

public class User
{
   public string Name { set; get; }
   public int Age { set; get; }
}

List<User> users = new()
                           {
                               new User { Name = "User 1", Age = 34 },
                               new User { Name = "User 2", Age = 24 },
                           };

var orderedUsers = users.Order();

public class User : IComparable<User>
{
    public string Name { set; get; }
    public int Age { set; get; }

    public int CompareTo(User? other)
    {
        if (ReferenceEquals(this, other))
        {
            return 0;
        }

        if (ReferenceEquals(null, other))
        {
            return 1;
        }

        var nameComparison = string.Compare(Name, other.Name, StringComparison.Ordinal);
        if (nameComparison != 0)
        {
            return nameComparison;
        }

        return Age.CompareTo(other.Age);
    }
}

var orderedUsers2 = users.OrderBy(user => user.Name).ThenBy(user => user.Age);

 PM> Install-Package structuremap

using System;
using StructureMap;

namespace AOP00
{
    public interface IMyType
    {
        void DoSomething(string data, int i);
    }

    public class MyType : IMyType
    {
        public void DoSomething(string data, int i)
        {
            Console.WriteLine("DoSomething({0}, {1});", data, i);
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            ObjectFactory.Initialize(x =>
            {
                x.For<IMyType>().Use<MyType>();
            });

            var myType = ObjectFactory.GetInstance<IMyType>();
            myType.DoSomething("Test", 1);
        }
    }
}

 PM> Install-Package Castle.Core

using System;
using Castle.DynamicProxy;

namespace AOP00
{
    public class LoggingInterceptor : IInterceptor
    {
        public void Intercept(IInvocation invocation)
        {
            try
            {
                Console.WriteLine("Logging On Start.");

                invocation.Proceed(); //فراخوانی متد اصلی در اینجا صورت می‌گیرد

                Console.WriteLine("Logging On Success.");
            }
            catch (Exception ex)
            {
                Console.WriteLine("Logging On Error.");
                throw;
            }
            finally
            {
                Console.WriteLine("Logging On Exit.");
            }
        }
    }
}

        static void Main(string[] args)
        {
            ObjectFactory.Initialize(x =>
            {
                var dynamicProxy = new ProxyGenerator();
                x.For<IMyType>().Use<MyType>();
                x.For<IMyType>().EnrichAllWith(myTypeInterface => dynamicProxy.CreateInterfaceProxyWithTarget(myTypeInterface, new LoggingInterceptor()));
            });

            var myType = ObjectFactory.GetInstance<IMyType>();
            myType.DoSomething("Test", 1);
        }

 Logging On Start.
DoSomething(Test, 1);
Logging On Success.
Logging On Exit.

var fileInfo = new FileInfo(outputFilePath);
long resumeOffset = 0;
if (fileInfo.Exists)
{
    resumeOffset = fileInfo.Length;
}
if (resumeOffset > 0)
{
    _client.DefaultRequestHeaders.Range = new RangeHeaderValue(resumeOffset, null);
}

var response = await client.GetAsync(url, HttpCompletionOption.ResponseHeadersRead);
if (response.Headers.AcceptRanges == null && resumeOffset > 0)
{
    // resume not supported, starting over
}

private readonly CancellationTokenSource _cts = new CancellationTokenSource();

var result = await client.GetAsync(url, HttpCompletionOption.ResponseHeadersRead, _cts.Token);
using(var stream = await result.Content.ReadAsStreamAsync())
{
   byte[] buffer = new byte[80000];
   int bytesRead;
   while((bytesRead = await stream.ReadAsync(buffer, 0, buffer.Length)) > 0 &&
         !_cts.IsCancellationRequested)
   {
      outputStream.Write(buffer, 0, bytesRead);
   }
}

public async Task DownloadFileAsync(string url, string outputFilePath, int maxRequestAutoRetries)
{
            var exceptions = new List<Exception>();

            do
            {
                --maxRequestAutoRetries;
                try
                {
                    await doDownloadFileAsync(url, outputFilePath);
                }
                catch (TaskCanceledException ex)
                {
                    exceptions.Add(ex);
                }
                catch (HttpRequestException ex)
                {
                    exceptions.Add(ex);
                }
                catch (Exception ex) when (isNetworkError(ex))
                {
                    exceptions.Add(ex);
                }

                // Wait a bit and try again later
               if (exceptions.Any())  await Task.Delay(2000, _cts.Token);
            } while (maxRequestAutoRetries > 0 &&
                     !_cts.IsCancellationRequested);

            var uniqueExceptions = exceptions.Distinct().ToList();
            if (uniqueExceptions.Any())
            {
                if (uniqueExceptions.Count() == 1)
                    throw uniqueExceptions.First();
                throw new AggregateException("Could not process the request.", uniqueExceptions);
            }
}

private static bool isNetworkError(Exception ex)
{
    if (ex is SocketException || ex is WebException)
        return true;
    if (ex.InnerException != null)
        return isNetworkError(ex.InnerException);
    return false;
}

using System.Diagnostics.CodeAnalysis;

namespace CS8Tests;

[Experimental(diagnosticId: "Test001")]
public class ExperimentalAttributeDemo
{
    public void Print()
    {
        Console.WriteLine("Hello Experimental Attribute");
    }
}

var experimentalAttributeDemo = new ExperimentalAttributeDemo();

error Test001: 'CS8Tests.ExperimentalAttributeDemo' is for evaluation purposes only
and is subject to change or removal in future updates. Suppress this diagnostic to proceed.

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>

    <NoWarn>Test001</NoWarn>
  </PropertyGroup>
</Project>

#pragma warning disable Test001
var demo = new ExperimentalAttributeDemo();
#pragma warning restore Test001

using System.Diagnostics.CodeAnalysis;

namespace CS8Tests;

[Experimental(diagnosticId: "Test001")]
public class ExperimentalAttributeDemo
{
    [Experimental(diagnosticId: "Test002")]
    public void Print()
    {
        Console.WriteLine("Hello Experimental Attribute");
    }
}

var demo = new ExperimentalAttributeDemo();
demo.Print();

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net8.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>

    <NoWarn>Test001,Test002</NoWarn>
  </PropertyGroup>
</Project>

#pragma warning disable Test001,Test002
var demo = new ExperimentalAttributeDemo();
demo.Print();
#pragma warning restore Test001,Test002