[Route("api/[controller]")]
    public class TypeaheadController : Controller
    {
        [HttpGet("[action]")]
        public async Task<IActionResult> SearchCountries(string term)
        {
            await Task.Delay(1000); // simulating a slow operation

            var items = new[]
                {
                     "Afghanistan",
                     "Albania",
                     "Algeria",
                     "American Samoa",
                     "Andorra",
                     "Angola",
                     "Anguilla",
                     "Antarctica",
                     "Antigua and/or Barbuda"
                };
            var results = string.IsNullOrWhiteSpace(term) ? items :
                           items.Where(item => item.StartsWith(term, StringComparison.OrdinalIgnoreCase));
            return Json(results.ToArray());
        }
    }

import { HttpClient, HttpErrorResponse } from "@angular/common/http";
import { Injectable } from "@angular/core";
import { Observable } from "rxjs/Observable";
import { ErrorObservable } from "rxjs/observable/ErrorObservable";
import { catchError, map } from "rxjs/operators";

@Injectable()
export class SearchService {

  constructor(private http: HttpClient) { }

  searchCountries(term: string): Observable<string[]> {
    return this.http
      .get(`/api/Typeahead/SearchCountries?term=${encodeURIComponent(term)}`)
      .pipe(
        map(response => response || {}),
        catchError((error: HttpErrorResponse) => ErrorObservable.create(error))
      );
  }
}

<label>Country: </label>
<input type="text" (input)="onSearch1Change($event.target.value)" />
<ul class="list-group">
   <li class="list-group-item" *ngFor="let country of countries1">
        {{country}}
   </li>
</ul>

onSearch1Change(value: string) {
 
}

 constructor(private searchService: SearchService) { }

export class AutocompleteSampleComponent implements OnInit {

  countries1: string[] = [];
  private model1Changed: Subject<string> = new Subject<string>();
  private dueTime = 300;

  constructor(private searchService: SearchService) { }

  ngOnInit() {
    this.model1Changed
      .pipe(
        debounceTime(this.dueTime),
        distinctUntilChanged(),
        flatMap(inputValue => {
          console.log("debounced input value1", inputValue);
          return this.searchService.searchCountries(inputValue);
        })
      )
      .subscribe(countries => {
        this.countries1 = countries;
      });
  }

  onSearch1Change(value: string) {
    this.model1Changed.next(value);
  }
}

// A1: Request for `ABC`
// A2: Response for `ABC`
// B1: Request for `ABCX`
// B2: Response for `ABCX`
--A1----------A2-->
------B1--B2------>

 PM> install-package OxyPlot.Wpf

<Window x:Class="OxyPlotWpfTests.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:oxy="http://oxyplot.org/wpf"
        xmlns:oxyPlotWpfTests="clr-namespace:OxyPlotWpfTests"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <oxyPlotWpfTests:MainWindowViewModel x:Key="MainWindowViewModel" />
    </Window.Resources>
    <Grid DataContext="{Binding Source={StaticResource MainWindowViewModel}}">
        <oxy:PlotView Model="{Binding PlotModel}"/>
    </Grid>
</Window>

public class MainWindowViewModel
{
   public PlotModel PlotModel { get; set; } 

        private void createPlotModel()
        {
            PlotModel = new PlotModel
            {
                Title = "سری خطوط",
                Subtitle = "Pan (right click and drag)/Zoom (Middle click and drag)/Reset (double-click)"
            };
            PlotModel.MouseDown += (sender, args) =>
            {
                if (args.ChangedButton == OxyMouseButton.Left && args.ClickCount == 2)
                {
                    foreach (var axis in PlotModel.Axes)
                        axis.Reset();

                    PlotModel.InvalidatePlot(false);
                }
            };
        }

       readonly LinearAxis _xAxis = new LinearAxis();
        private void addXAxis()
        {
            _xAxis.Minimum = 0;
            _xAxis.MaximumPadding = 1;
            _xAxis.MinimumPadding = 1;
            _xAxis.Position = AxisPosition.Bottom;
            _xAxis.Title = "X axis";
            _xAxis.MajorGridlineStyle = LineStyle.Solid;
            _xAxis.MinorGridlineStyle = LineStyle.Dot;
            PlotModel.Axes.Add(_xAxis);
        }

        readonly LinearAxis _yAxis = new LinearAxis();
        private void addYAxis()
        {
            _yAxis.Minimum = 0;
            _yAxis.Title = "Y axis";
            _yAxis.MaximumPadding = 1;
            _yAxis.MinimumPadding = 1;
            _yAxis.MajorGridlineStyle = LineStyle.Solid;
            _yAxis.MinorGridlineStyle = LineStyle.Dot;
            PlotModel.Axes.Add(_yAxis);
        }

        readonly LineSeries _lineSeries1 = new LineSeries();
        private void addLineSeries1()
        {
            _lineSeries1.MarkerType = MarkerType.Circle;
            _lineSeries1.StrokeThickness = 2;
            _lineSeries1.MarkerSize = 3;
            _lineSeries1.Title = "Start";
            _lineSeries1.MouseDown += (s, e) =>
            {
                if (e.ChangedButton == OxyMouseButton.Left)
                {
                    PlotModel.Subtitle = "Index of nearest point in LineSeries: " + Math.Round(e.HitTestResult.Index);
                    PlotModel.InvalidatePlot(false);
                }
            };
            PlotModel.Series.Add(_lineSeries1);
        }

        readonly LineSeries _lineSeries2 = new LineSeries();
        private void addLineSeries2()
        {
            _lineSeries2.MarkerType = MarkerType.Circle;
            _lineSeries2.Title = "End";
            _lineSeries2.StrokeThickness = 2;
            _lineSeries2.MarkerSize = 3;
            _lineSeries2.MouseDown += (s, e) =>
            {
                if (e.ChangedButton == OxyMouseButton.Left)
                {
                    PlotModel.Subtitle = "Index of nearest point in LineSeries: " + Math.Round(e.HitTestResult.Index);
                    PlotModel.InvalidatePlot(false);
                }
            };
            PlotModel.Series.Add(_lineSeries2);
        }

        private int _xMax;
        private int _yMax;
        private bool _haveNewPoints;
        private void addPoints()
        {
            var timer = new DispatcherTimer {Interval = TimeSpan.FromSeconds(1)};
            var rnd = new Random();
            var x = 1;
            updateXMax(x);
            timer.Tick += (sender, args) =>
            {
                var y1 = rnd.Next(100);
                updateYMax(y1);
                _lineSeries1.Points.Add(new DataPoint(x, y1));

                var y2 = rnd.Next(100);
                updateYMax(y2);
                _lineSeries2.Points.Add(new DataPoint(x, rnd.Next(y2)));

                x++;

                updateXMax(x);
                _haveNewPoints = true;
            };
            timer.Start();
        }

        private void updateXMax(int value)
        {
            if (value > _xMax)
            {
                _xMax = value;
            }
        }

        private void updateYMax(int value)
        {
            if (value > _yMax)
            {
                _yMax = value;
            }
        }

        private readonly Stopwatch _stopwatch = new Stopwatch();
        private void updatePlot()
        {
            CompositionTarget.Rendering += (sender, args) =>
            {
                if (_stopwatch.ElapsedMilliseconds > _lastUpdateMilliseconds + 2000 && _haveNewPoints)
                {
                    if (_yMax > 0 && _xMax > 0)
                    {
                        _yAxis.Maximum = _yMax + 3;
                        _xAxis.Maximum = _xMax + 1;
                    }

                    PlotModel.InvalidatePlot(false);

                    _haveNewPoints = false;
                    _lastUpdateMilliseconds = _stopwatch.ElapsedMilliseconds;
                }
            };
        }

Here’s a summary of what’s new in this preview release:

• Improved startup debugging experience
• Blazor
  • Form model binding & validation with server-side rendering
  • Enhanced page navigation & form handling
  • Preserve existing DOM elements with streaming rendering
  • Specify component render mode at the call site
  • Interactive rendering with Blazor WebAssembly
  • Sections improvements
  • Cascade query string values to Blazor components
  • Blazor Web App template option for enabling server interactivity
  • Blazor template consolidation
• Metrics
  • Testing metrics in ASP.NET Core apps
  • New, improved, and renamed counters
• API authoring
  • Complex form binding support in minimal APIs
• Servers & middleware
  • HTTP.sys kernel response buffering
  • Redis-based output-cache
   

static void Main(string[] args)
{
    int Add(int a, int b)
    {
        return a + b;
    }
 
    Console.WriteLine(Add(3, 4)); 
}

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

    public override string ToString()
    {
        string ageSuffix = GenerateAgeSuffix(Age);
        return $"{Name} is {Age} year{ageSuffix} old";
    }

    private string GenerateAgeSuffix(int age)
    {
        return age > 1 ? "s" : "";
    }
}

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

    public override string ToString()
    {
        Func<int, string> generateAgeSuffix = age => age > 1 ? "s" : "";
        return $"{Name} is {Age} year{generateAgeSuffix(Age)} old";
    }
}

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

    public override string ToString()
    {
        return $"{Name} is {Age} year{GenerateAgeSuffix(Age)} old";
        // Define a local function:
        string GenerateAgeSuffix(int age)
        {
            return age > 1 ? "s" : "";
        }
    }
}

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

    public override string ToString()
    {
        return $"{Name} is {Age} year{GenerateAgeSuffix()} old";
        // Define a local function:
        string GenerateAgeSuffix()
        {
            return Age > 1 ? "s" : "";
        }
    }
}

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

    public override string ToString()
    {
        return $"{Name} is {Age} year{GenerateAgeSuffix(Age)} old";
        // Define a local function:
        string GenerateAgeSuffix(int age) => age > 1 ? "s" : "";
    }
}

public class LocalFunctionsTest
{
    public void PassAnonFunctionToMethod()
    {
        var p = new SimplePerson
        {
            Name = "Name1",
            Age = 42
        };
        OutputSimplePerson(p, GenerateAgeSuffix);
        string GenerateAgeSuffix(int age) => age > 1 ? "s" : "";
    }
 
    private void OutputSimplePerson(SimplePerson person, Func<int, string> suffixFunction)
    {
        Output.WriteLine(
        $"{person.Name} is {person.Age} year{suffixFunction(person.Age)} old");
    }
}

        public DateTime BirthDate { get; set; }
        public DateTime HireDate { get; set; }
        public DateTime? LeaveDate { get; set; }

از این جدول چه می‌فهمید؟ با یک نگاه می‌توان فهمید که ساختار بالای من باید 24 بایت گرفته باشد؛ برای ساختاری که هم تاریخ و هم زمان (ساعت) را پشتیبانی می‌کند. ولی با نگاه دقیق‌تر به نام پراپرتی‌ها این نکته روشن می‌شود که ما یک گپ Gap (فضای بیهوده) داریم چون زمان تولد، استخدام و ترک سازمان اصلا نیازی به ساعت ندارند و همان تاریخ کافی است. یعنی نوع Date با حجم کلی 9 بایت؛ که در نتیجه 15 بایت صرفه جویی در یک رکورد صورت خواهد گرفت.

پس کد بالا را به شکل زیر تغییر می‌دهم:

          [Column(TypeName = "date")]
        public DateTime BirthDate { get; set; }

        [Column(TypeName = "date")]
        public DateTime HireDate { get; set; }

        [Column(TypeName = "date")]
        public DateTime? LeaveDate { get; set; }

خصوصیت Column از نسخه 4.5دات نت فریم ورک اضافه شده و در فضای نام System.ComponentModel.DataAnnotations.Schema قرار گرفته است.

‎[DllImport("shell32.DLL")]‎
‎  [DllImport("User32.DLL")]‎
public string Lpwindow { get; set; }
   public IntPtr Hicon { get; set; }
       public static extern int ShellAbout(IntPtr hwnd,string szApp,string ‎szotherstuff,IntPtr hicon );‎
        public static extern int FindWindow(string str,string lpwindow);‎

        private void btnbutton1_Click(object sender, EventArgs e)
          {

          var  Window = (IntPtr)FindWindow(null, Lpwindow);

              ShellAbout(Window, "===WINDOWS===", "HELLO", Hicon);
          }

‎[DllImport("powrprof.dll")]‎
public static extern int SetSuspendState(int hibernate,int forcecritical,int ‎DisablewakeEvent);‎

  private void btnbutton1_Click(object sender, EventArgs e)
          {

              SetSuspendState(1, 0, 0);
          }

‎[DllImport(“user32.DLL”)]‎
‎   ‎‎ public static extern int  LockWorkStation();‎

  private void btnbutton1_Click(object sender, EventArgs e)
          {
              LockWorkStation();
          }

‏ ‏DllImport("kernel32.DLL")]‎
  public static extern int FatalAppExit(int uAction,string ipmesseg);‎

   private void btnbutton1_Click(object sender, EventArgs e)
          {
              FatalAppExit(0, "ERROR PROGRAM");
          }

‎[DllImport("Winmm.DLL")]‎
public static extern long  timeGetTime();‎

        private void timer1_Tick(object sender, EventArgs e)
        {
            var sd = Convert.ToString(timeGetTime());
            int i = Convert.ToInt32(sd.Substring(0, sd.Length - 3));
            int m;
            if (i < 60)
                textBox1.Text = @"00:00:" + i;
            else if (i >= 60 && i < 3600)
            {
                m = i / 60;
                S = i % 60;
                textBox1.Text = @"00:" + m + @":";
            }
            else
            {
                var h = i / 3600;
                var mm = i % 3600;

                if (mm > 59)
                {
                    m = mm / 60;
                    S = mm % 60;
                    textBox1.Text = h + @":" + m.ToString(CultureInfo.InvariantCulture) + @":" + S;
                }
                else
                {
                    textBox1.Text = h + @":00:" + mm;
                }
            }
        }

     private void Form1_Load(object sender, EventArgs e)
        {
          timer1.Start();
         }

namespace SignalR02.Services
{
    public interface ITestService
    {
        int GetRecordsCount();
    }
}

namespace SignalR02.Services
{
    public class TestService : ITestService
    {
        public int GetRecordsCount()
        {
            return 10; // It's just a sample to test IOC's.
        }
    }
}

    [HubName("chat")]
    public class ChatHub : Hub
    {
        //جهت آزمایش تزریق خودکار وابستگی‌ها
        private readonly ITestService _testService;
        public ChatHub(ITestService testService)
        {
            _testService = testService;
        }

        public void SendMessage(string message)
        {
            var msg = string.Format("{0}:{1}", Context.ConnectionId, message);
            Clients.All.hello(msg);

            Clients.All.hello(string.Format("RecordsCount: {0}", _testService.GetRecordsCount()));

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.AspNet.SignalR;
using StructureMap;

namespace SignalR02.Utils
{
    public class StructureMapDependencyResolver : DefaultDependencyResolver
    {
        private readonly IContainer _container;
        public StructureMapDependencyResolver(IContainer container)
        {
            if (container == null)
            {
                throw new ArgumentNullException("container");
            }
            _container = container;
        }
        public override object GetService(Type serviceType)
        {
            return !serviceType.IsAbstract && !serviceType.IsInterface && serviceType.IsClass
                               ? _container.GetInstance(serviceType)
                               : (_container.TryGetInstance(serviceType) ?? base.GetService(serviceType));
        }
        public override IEnumerable<object> GetServices(Type serviceType)
        {
            return _container.GetAllInstances(serviceType).Cast<object>().Concat(base.GetServices(serviceType));
        }
    }
}

using System;
using System.Web;
using System.Web.Routing;
using Microsoft.AspNet.SignalR;
using SignalR02.Services;
using SignalR02.Utils;
using StructureMap;

namespace SignalR02
{
    public class Global : HttpApplication
    {
        protected void Application_Start(object sender, EventArgs e)
        {
            ObjectFactory.Initialize(cfg => 
            {
                cfg.For<IDependencyResolver>().Singleton().Add<StructureMapDependencyResolver>(); 
                // the rest ...
                cfg.For<ITestService>().Use<TestService>();
            });
            GlobalHost.DependencyResolver = ObjectFactory.GetInstance<IDependencyResolver>();

            // Register the default hubs route: ~/signalr
            RouteTable.Routes.MapHubs(new HubConfiguration
            {
                EnableCrossDomain = true
            });            
        }
    }
}

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)