[ServiceContract]
    public interface IScannerService
    {
        [OperationContract]
        [WebInvoke(Method = "GET",
           BodyStyle = WebMessageBodyStyle.Wrapped,
           RequestFormat = WebMessageFormat.Json,
           ResponseFormat = WebMessageFormat.Json,
           UriTemplate = "GetScan")]
        string GetScan();
    }

    public class ScannerService : IScannerService
    {
        public string GetScan()
        {
            // TODO Add code here
        }
    }

using WIA;

        public string GetScan()
        {
            var imgResult = String.Empty;
            var dialog = new CommonDialogClass();
            try
            {
                // نمایش فرم پیشفرض اسکنر
                var image = dialog.ShowAcquireImage(WiaDeviceType.ScannerDeviceType);
                
                // ذخیره تصویر در یک فایل موقت
                var filename = Path.GetTempFileName();
                image.SaveFile(filename);
                var img = Image.FromFile(filename);

                // img جهت ارسال سمت کاربر و نمایش در تگ Base64 تبدیل تصویر به 
                imgResult = ImageHelper.ImageToBase64(img, ImageFormat.Jpeg);
            }
            catch
            {
                // از آنجاییه که امکان نمایش خطا وجود ندارد در صورت بروز خطا رشته خالی 
                // بازگردانده می‌شود که به معنای نبود تصویر می‌باشد
            }

            return imgResult;
        }

        public static string ImageToBase64(Image image, System.Drawing.Imaging.ImageFormat format)
        {
            if (image != null)
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    // Convert Image to byte[]
                    image.Save(ms, format);
                    byte[] imageBytes = ms.ToArray();

                    // Convert byte[] to Base64 String
                    string base64String = Convert.ToBase64String(imageBytes);
                    return base64String;
                }
            }
            return String.Empty;
        }

        private readonly Uri _baseAddress = new Uri("http://localhost:6019");
        private ServiceHost _host;

        private void Form1_Load(object sender, EventArgs e)
        {
            _host = new ServiceHost(typeof(WcfServiceScanner.ScannerService), _baseAddress);
            _host.Open();
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            _host.Close();
        }

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <startup> 
        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    </startup>

  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior name="BehaviourMetaData">
          <serviceMetadata httpGetEnabled="true" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <services>
      <service name="WcfServiceScanner.ScannerService"
               behaviorConfiguration="BehaviourMetaData">
        <endpoint address=""
                  binding="basicHttpBinding"
                  contract="WcfServiceScanner.IScannerService" />
      </service>
    </services>
  </system.serviceModel>

</configuration>

<a href="#" id="get-scan">Get Scan</a>
<img src="" id="img-scanned" />
<script>
    $("#get-scan").click(function () {
        var url = 'http://localhost:6019/';
        $.get(url, function (data) {
            $("#img-scanned").attr("src","data:image/Jpeg;base64,  "+ data.GetScanResult);
        });
    });
</script>

    public class CORSSupport : IDispatchMessageInspector
    {
        Dictionary<string, string> requiredHeaders;
        public CORSSupport(Dictionary<string, string> headers)
        {
            requiredHeaders = headers ?? new Dictionary<string, string>();
        }

        public object AfterReceiveRequest(ref System.ServiceModel.Channels.Message request, System.ServiceModel.IClientChannel channel, System.ServiceModel.InstanceContext instanceContext)
        {
            var httpRequest = request.Properties["httpRequest"] as HttpRequestMessageProperty;
            if (httpRequest.Method.ToLower() == "options")
                instanceContext.Abort();
            return httpRequest;
        }

        public void BeforeSendReply(ref System.ServiceModel.Channels.Message reply, object correlationState)
        {
            var httpResponse = reply.Properties["httpResponse"] as HttpResponseMessageProperty;
            var httpRequest = correlationState as HttpRequestMessageProperty;

            foreach (var item in requiredHeaders)
            {
                httpResponse.Headers.Add(item.Key, item.Value);
            }
            var origin = httpRequest.Headers["origin"];
            if (origin != null)
                httpResponse.Headers.Add("Access-Control-Allow-Origin", origin);

            var method = httpRequest.Method;
            if (method.ToLower() == "options")
                httpResponse.StatusCode = System.Net.HttpStatusCode.NoContent;

        }
    }

    // Simply apply this attribute to a DataService-derived class to get
    // CORS support in that service
    [AttributeUsage(AttributeTargets.Class)]
    public class CORSSupportBehaviorAttribute : Attribute, IServiceBehavior
    {
        #region IServiceBehavior Members

        void IServiceBehavior.AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, System.Collections.ObjectModel.Collection<ServiceEndpoint> endpoints, BindingParameterCollection bindingParameters)
        {
        }

        void IServiceBehavior.ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
        {
            var requiredHeaders = new Dictionary<string, string>();

            //Chrome doesn't accept wildcards when authorization flag is true
            //requiredHeaders.Add("Access-Control-Allow-Origin", "*");
            requiredHeaders.Add("Access-Control-Request-Method", "POST,GET,PUT,DELETE,OPTIONS");
            requiredHeaders.Add("Access-Control-Allow-Headers", "Accept, Origin, Authorization, X-Requested-With,Content-Type");
            requiredHeaders.Add("Access-Control-Allow-Credentials", "true");
            foreach (ChannelDispatcher cd in serviceHostBase.ChannelDispatchers)
            {
                foreach (EndpointDispatcher ed in cd.Endpoints)
                {
                    ed.DispatchRuntime.MessageInspectors.Add(new CORSSupport(requiredHeaders));
                }
            }
        }

        void IServiceBehavior.Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
        {
        }

        #endregion
    }

using System.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Description;
using System.ServiceModel.Dispatcher;

    [CORSSupportBehavior]
    public class ScannerService : IScannerService
    {

ایجاد اپلیکیشن جدید

var user = new ApplicationUser() { UserName = model.UserName };  
var result = await UserManager.CreateAsync(user, model.Password);
  
if (result.Succeeded)
{
    await SignInAsync(user, isPersistent: false);  
    return RedirectToAction("Index", "Home");
}

قانون 1: کلمه‌های عبور باید حداقل 10 کاراکتر باشند

public class ApplicationUserManager : UserManager<ApplicationUser>
{
    public ApplicationUserManager(): base(new UserStore<ApplicationUser>(new ApplicationDbContext()))
    {
        PasswordValidator = new MinimumLengthValidator (10);
    }
}

 public AccountController() : this(new ApplicationUserManager())
         {
         }
  
         public AccountController(ApplicationUserManager userManager)
         {
             UserManager = userManager;
         }
         public ApplicationUserManager UserManager { get; private set; }

public class CustomPasswordValidator : IIdentityValidator<string> 
{  
    public int RequiredLength { get; set; }

    public CustomPasswordValidator(int length)
    {
        RequiredLength = length;
    }
  
    public Task<IdentityResult> ValidateAsync(string item)
    {
        if (String.IsNullOrEmpty(item) || item.Length < RequiredLength)
        {
            return Task.FromResult(IdentityResult.Failed(String.Format("Password should be of length {0}",RequiredLength)));
        }
  
    string pattern = @"^(?=.*[0-9])(?=.*[!@#$%^&*])[0-9a-zA-Z!@#$%^&*0-9]{10,}$";
   
    if (!Regex.IsMatch(item, pattern))  
    {
        return Task.FromResult(IdentityResult.Failed("Password should have one numeral and one special character"));
    }
  
    return Task.FromResult(IdentityResult.Success);
 }

public class ApplicationUserManager : UserManager<ApplicationUser>  
{  
    public ApplicationUserManager() : base(new UserStore<ApplicationUser(new ApplicationDbContext()))
    {
        PasswordValidator = new CustomPasswordValidator(10);
    }
 }

public class PreviousPassword  
{
  
 public PreviousPassword()
 {
    CreateDate = DateTimeOffset.Now;
 }
  
 [Key, Column(Order = 0)]
  
 public string PasswordHash { get; set; }
  
 public DateTimeOffset CreateDate { get; set; }
  
 [Key, Column(Order = 1)]
  
 public string UserId { get; set; }
  
 public virtual ApplicationUser User { get; set; }
  
 }

public class ApplicationUser : IdentityUser
{
    public ApplicationUser() : base()
    {
        PreviousUserPasswords = new List<PreviousPassword>();
     }

     public virtual IList<PreviousPassword> PreviousUserPasswords { get; set; }
}

public class ApplicationUserStore : UserStore<ApplicationUser>
{ 
    public ApplicationUserStore(DbContext context) : base(context)  { }
  
    public override async Task CreateAsync(ApplicationUser user)
    {
        await base.CreateAsync(user);
        await AddToPreviousPasswordsAsync(user, user.PasswordHash);
    }
  
     public Task AddToPreviousPasswordsAsync(ApplicationUser user, string password)
     {
        user.PreviousUserPasswords.Add(new PreviousPassword() { UserId = user.Id, PasswordHash = password });
  
        return UpdateAsync(user);
     }
 }

public class ApplicationUserManager : UserManager<ApplicationUser>
    {
        private const int PASSWORD_HISTORY_LIMIT = 5;

        public ApplicationUserManager() : base(new ApplicationUserStore(new ApplicationDbContext()))
        {
            PasswordValidator = new CustomPasswordValidator(10);
        }

        public override async Task<IdentityResult> ChangePasswordAsync(string userId, string currentPassword, string newPassword)
        {
            if (await IsPreviousPassword(userId, newPassword))
            {
                return await Task.FromResult(IdentityResult.Failed("Cannot reuse old password"));
            }

            var result = await base.ChangePasswordAsync(userId, currentPassword, newPassword);

            if (result.Succeeded)
            {
                var store = Store as ApplicationUserStore;
                await store.AddToPreviousPasswordsAsync(await FindByIdAsync(userId), PasswordHasher.HashPassword(newPassword));
            }

            return result;
        }

        public override async Task<IdentityResult> ResetPasswordAsync(string userId, string token, string newPassword)
        {
            if (await IsPreviousPassword(userId, newPassword))
            {
                return await Task.FromResult(IdentityResult.Failed("Cannot reuse old password"));
            }

            var result = await base.ResetPasswordAsync(userId, token, newPassword);

            if (result.Succeeded)
            {
                var store = Store as ApplicationUserStore;
                await store.AddToPreviousPasswordsAsync(await FindByIdAsync(userId), PasswordHasher.HashPassword(newPassword));
            }

            return result;
        }

        private async Task<bool> IsPreviousPassword(string userId, string newPassword)
        {
            var user = await FindByIdAsync(userId);

            if (user.PreviousUserPasswords.OrderByDescending(x => x.CreateDate).
                Select(x => x.PasswordHash).Take(PASSWORD_HISTORY_LIMIT)
                .Where(x => PasswordHasher.VerifyHashedPassword(x, newPassword) != PasswordVerificationResult.Failed).Any())
            {
                return true;
            }

            return false;
        }
    }

public bool IsValidIranianLegalCode(string input)
        {
            //input has 11 digits that all of them are not equal
            if (!Regex.IsMatch(input, @"^(?!(\d)\1{10})\d{11}$"))
                return false;

            var check = Convert.ToInt32(input.Substring(10, 1));
            int dec = Convert.ToInt32(input.Substring(9, 1)) + 2;
            int[] Coef = new int[10] { 29, 27, 23, 19, 17, 29, 27, 23, 19, 17 };

            var sum = Enumerable.Range(0, 10)
                          .Select(x => (Convert.ToInt32(input.Substring(x, 1)) + dec) * Coef[x])
                          .Sum() % 11;

            return sum == check;
        }

using System;
using System.Reflection;
using System.Reflection.Emit;

namespace FastReflectionTests
{
    class Program
    {
        static void Main(string[] args)
        {
            var name = "HelloWorld.exe";
            var assemblyName = new AssemblyName(name);
            // ایجاد یک اسمبلی جدید با قابلیت ذخیره سازی آن
            var assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(
                                            name: assemblyName,
                                            access: AssemblyBuilderAccess.RunAndSave);
            // افزودن یک ماژول به اسمبلی
            var moduleBuilder = assemblyBuilder.DefineDynamicModule(name);
            // تعریف یک کلاس در این ماژول
            var programmClass = moduleBuilder.DefineType("Program", TypeAttributes.Public);
            // افزودن یک متد به این کلاس
            // این متد خروجی ندارد اما ورودی آن شبیه به متد اصلی یک برنامه کنسول است
            var mainMethod = programmClass.DefineMethod(name: "Main",
                                            attributes: MethodAttributes.Public | MethodAttributes.Static,
                                            returnType: null,
                                            parameterTypes: new Type[] { typeof(string[]) });
            // تعیین بدنه متد اصلی برنامه
            var il = mainMethod.GetILGenerator();
            il.Emit(OpCodes.Ldstr, "Hello World!");
            il.Emit(OpCodes.Call, (typeof(Console)).GetMethod("WriteLine", new Type[] { typeof(string) }));
            il.Emit(OpCodes.Call, (typeof(Console)).GetMethod("ReadKey", new Type[0]));
            il.Emit(OpCodes.Pop);
            il.Emit(OpCodes.Ret);

            // تکمیل کار ایجاد نوع جدید
            programmClass.CreateType();

            // تعیین نقطه شروع فایل اجرایی برنامه کنسول تهیه شده
            assemblyBuilder.SetEntryPoint(((Type)programmClass).GetMethod("Main"));

            // ذخیره سازی این اسمبلی بر روی دیسک سخت
            assemblyBuilder.Save(name);
        }
    }
}

using System;
 
namespace CS6NewFeatures
{
    class Person
    {
        public string FirstName { set; get; }
        public string LastName { set; get; }
        public int Age { set; get; }
    }
 
    class Program
    {
        static void Main(string[] args)
        {
            var person = new Person { FirstName = "User 1", LastName = "Last Name 1", Age = 50 };
            var message = string.Format("Hello!  My name is {0} {1} and I am {2} years old.",
                                          person.FirstName, person.LastName, person.Age);
            Console.Write(message);
        }
    }
}

static void Main(string[] args)
{
    var person = new Person { FirstName = "User 1", LastName = "Last Name 1", Age = 50 };
    var message = $"Hello!  My name is {person.FirstName} {person.LastName} and I am {person.Age} years old.";
    Console.Write(message);
}

 var message2 = $"{Environment.NewLine}Test {DateTime.Now}, {3*2}";
Console.Write(message2);

 var message3 = $"{Environment.NewLine}{1000000:n0} {DateTime.Now:dd-MM-yyyy}";
Console.Write(message3);

class MyDateFormatProvider : IFormatProvider
{
    readonly MyDateFormatter _formatter = new MyDateFormatter();
 
    public object GetFormat(Type formatType)
    {
        return formatType == typeof(ICustomFormatter) ? _formatter : null;
    }
 
    class MyDateFormatter : ICustomFormatter
    {
        public string Format(string format, object arg, IFormatProvider formatProvider)
        {
            if (arg is DateTime)
                return ((DateTime)arg).ToString("MM/dd/yyyy");
            return arg.ToString();
        }
    }
}

static string formatMyDate(FormattableString formattable)
{
      return formattable.ToString(new MyDateFormatProvider());
}

 var message2 = formatMyDate($"{Environment.NewLine}Test {DateTime.Now}, {3*2}");
Console.Write(message2);

public static string faIr(IFormattable formattable)
{
    return formattable.ToString(null, new CultureInfo("fa-Ir"));
}

 static string invariant(FormattableString formattable)
{
    return formattable.ToString(CultureInfo.InvariantCulture);
}

 var message0 = $"Hello! My name is {person.FirstName} {{person.FirstName}}";

 Console.Write($"{(person.Age>50 ? "old": "young")}");

A Tour of Go (golang) for the C# Developer

Learning other programming languages enhances our work in our primary language. From the perspective of a C# developer, the Go language (golang) has many interesting ideas. Go is opinionated on some things (such as where curly braces go and what items are capitalized). Declaring an unused variable causes a compile failure; the use of "blank identifiers" (or "discards" in C#) are common. Concurrency is baked right in to the language through goroutines and channels. Programming by exception is discouraged; it's actually called a "panic" in Go. Instead, errors are treated as states to be handled like any other data state. We'll explore these features (and others) by building an application that uses concurrent operations to get data from a service. These ideas make us think about the way we program and how we can improve our day-to-day work (in C# or elsewhere).

0:00 Welcome to Go
2:40 Step 1: Basics
12:20 Step 2: Calling a web service
23:35 Step 3: Parsing JSON
36:26 Step 4: "for" loops
41:00 Step 5: Interfaces and methods
50:05 Step 6: Time and Args
55:10 Step 7: Concurrency
1:07:10 Step 8: Errors
1:14:40 Step 9: Concurrency and errors
1:24:35 Where to go next 

using System.IO;
using System.Web.Mvc;

namespace MVC4Basic.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        const int AMonth = 30 * 86400;

        [OutputCache(Duration = AMonth, VaryByParam = "name")]
        public ActionResult GetImage(string name)
        {
            name = Path.GetFileName(name);
            var path = Server.MapPath(string.Format("~/app_data/images/{0}", name));
            var content = System.IO.File.ReadAllBytes(path);
            return File(content, "image/png", name);
        }
    }
}

 <img src="@Url.Action("GetImage","Home", new { name = "test.png"})"/>

 Remote Address:127.0.0.1:5656
Request URL:http://localhost:10419/Home/GetImage?name=test.png
Request Method:GET
Status Code:200 OK

Response Headers
Cache-Control:public, max-age=2591916
Expires:Sat, 31 May 2014 12:45:55 GMT
Last-Modified:Thu, 01 May 2014 12:45:55 GMT

 Remote Address:127.0.0.1:5656
Request URL:http://localhost:10419/Home/GetImage?name=test.png
Request Method:GET
Status Code:304 Not Modified

Request Headers
If-Modified-Since:Thu, 01 May 2014 12:45:55 GMT

 Remote Address:127.0.0.1:5656
Request URL:http://localhost:10419/Home/GetImage?name=test.png
Request Method:GET
Status Code:200 OK (from cache)

 Remote Address:127.0.0.1:5656
Request URL:http://localhost:10419/Home/GetImage?name=test.png
Request Method:GET
Status Code:200 OK

Request Headers
If-Modified-Since:Thu, 01 May 2014 12:45:55 GMT

using System;
using System.IO;
using System.Net;
using System.Web.Mvc;

namespace MVC4Basic.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            return View();
        }

        const int AMonth = 30 * 86400;

        [OutputCache(Duration = AMonth, VaryByParam = "name")]
        public ActionResult GetImage(string name)
        {
            name = Path.GetFileName(name);
            var path = Server.MapPath(string.Format("~/app_data/images/{0}", name));

            var lastWriteTime = System.IO.File.GetLastWriteTime(path);
            this.Response.Cache.SetLastModified(lastWriteTime.ToUniversalTime());

            var header = this.Request.Headers["If-Modified-Since"];
            if (!string.IsNullOrWhiteSpace(header))
            {
                DateTime isModifiedSince;
                if (DateTime.TryParse(header, out isModifiedSince) && isModifiedSince > lastWriteTime)
                {
                    return new HttpStatusCodeResult(HttpStatusCode.NotModified);
                }
            }

            var content = System.IO.File.ReadAllBytes(path);
            return File(content, "image/png", name);
        }
    }
}

 Remote Address:127.0.0.1:5656
Request URL:http://localhost:10419/Home/GetImage?name=test.png
Request Method:GET
Status Code:304 Not Modified

Request Headers
If-Modified-Since:Thu, 01 May 2014 13:43:32 GMT

    [AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
    public sealed class SetIfModifiedSinceAttribute : ActionFilterAttribute
    {
        public string Parameter { set; get; }
        public string BasePath { set; get; }

        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            var response = filterContext.RequestContext.HttpContext.Response;
            var request = filterContext.RequestContext.HttpContext.Request;

            var path = getPath(filterContext);
            if (string.IsNullOrWhiteSpace(path))
            {
                response.StatusCode = (int)HttpStatusCode.NotFound;
                filterContext.Result = new EmptyResult();
                return;
            }

            var lastWriteTime = File.GetLastWriteTime(path);
            response.Cache.SetLastModified(lastWriteTime.ToUniversalTime());

            var header = request.Headers["If-Modified-Since"];
            if (string.IsNullOrWhiteSpace(header)) return;
            DateTime isModifiedSince;
            if (DateTime.TryParse(header, out isModifiedSince) && isModifiedSince > lastWriteTime)
            {
                response.StatusCode = (int)HttpStatusCode.NotModified;
                response.SuppressContent = true;
                filterContext.Result = new EmptyResult();
            }
        }

        string getPath(ActionExecutingContext filterContext)
        {
            if (!filterContext.ActionParameters.ContainsKey(Parameter)) return string.Empty;
            var name = filterContext.ActionParameters[Parameter] as string;
            if (string.IsNullOrWhiteSpace(name)) return string.Empty;

            var path = Path.GetFileName(name);
            path = filterContext.HttpContext.Server.MapPath(string.Format("{0}/{1}", BasePath, path));
            return !File.Exists(path) ? string.Empty : path;
        }
    }

        [SetIfModifiedSince(Parameter = "name", BasePath = "~/app_data/images/")]
        [OutputCache(Duration = AMonth, VaryByParam = "name")]
        public ActionResult GetImage(string name)
        {
            name = Path.GetFileName(name);
            var path = Server.MapPath(string.Format("~/app_data/images/{0}", name));
            var content = System.IO.File.ReadAllBytes(path);
            return File(content, "image/png", name);
        }