namespace DNT.IDP
{
    public static class Config
    {
        // api-related resources (scopes)
        public static IEnumerable<ApiResource> GetApiResources()
        {
            return new List<ApiResource>
            {
                new ApiResource(
                    name: "imagegalleryapi",
                    displayName: "Image Gallery API",
                    claimTypes: new List<string> {"role" })
            };
        }

AllowedScopes =
{
  IdentityServerConstants.StandardScopes.OpenId,
  IdentityServerConstants.StandardScopes.Profile,
  IdentityServerConstants.StandardScopes.Address,
  "roles",
  "imagegalleryapi"
},

namespace DNT.IDP
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();

            services.AddIdentityServer()
             .AddDeveloperSigningCredential()
             .AddTestUsers(Config.GetUsers())
             .AddInMemoryIdentityResources(Config.GetIdentityResources())
             .AddInMemoryApiResources(Config.GetApiResources())
             .AddInMemoryClients(Config.GetClients());
        }

options.Scope.Add("imagegalleryapi");

dotnet add package IdentityServer4.AccessTokenValidation

using IdentityServer4.AccessTokenValidation;

namespace ImageGallery.WebApi.WebApp
{
    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddAuthentication(defaultScheme: IdentityServerAuthenticationDefaults.AuthenticationScheme)
               .AddIdentityServerAuthentication(options =>
               {
                   options.Authority = Configuration["IDPBaseAddress"];
                   options.ApiName = "imagegalleryapi";
               });

namespace ImageGallery.WebApi.WebApp
{
    public class Startup
    {
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            app.UseAuthentication();

namespace ImageGallery.WebApi.WebApp.Controllers
{
    [Route("api/images")]
    [Authorize]
    public class ImagesController : Controller
    {

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Configuration;
using Microsoft.IdentityModel.Protocols.OpenIdConnect;

namespace ImageGallery.MvcClient.Services
{
    public interface IImageGalleryHttpClient
    {
        Task<HttpClient> GetHttpClientAsync();
    }

    /// <summary>
    /// A typed HttpClient.
    /// </summary>
    public class ImageGalleryHttpClient : IImageGalleryHttpClient
    {
        private readonly HttpClient _httpClient;
        private readonly IConfiguration _configuration;
        private readonly IHttpContextAccessor _httpContextAccessor;

        public ImageGalleryHttpClient(
            HttpClient httpClient,
            IConfiguration configuration,
            IHttpContextAccessor httpContextAccessor)
        {
            _httpClient = httpClient;
            _configuration = configuration;
            _httpContextAccessor = httpContextAccessor;
        }

        public async Task<HttpClient> GetHttpClientAsync()
        {
            var currentContext = _httpContextAccessor.HttpContext;
            var accessToken = await currentContext.GetTokenAsync(OpenIdConnectParameterNames.AccessToken);
            if (!string.IsNullOrWhiteSpace(accessToken))
            {
                _httpClient.SetBearerToken(accessToken);
            }

            _httpClient.BaseAddress = new Uri(_configuration["WebApiBaseAddress"]);
            _httpClient.DefaultRequestHeaders.Accept.Clear();
            _httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

            return _httpClient;
        }
    }
}

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="2.1.1.0" />
    <PackageReference Include="Microsoft.AspNetCore.Http" Version="2.1.1.0" />
    <PackageReference Include="Microsoft.AspNetCore.Authentication.Abstractions" Version="2.1.1.0" />
    <PackageReference Include="Microsoft.IdentityModel.Protocols.OpenIdConnect" Version="5.2.0.0" />
    <PackageReference Include="IdentityModel" Version="3.9.0" />
  </ItemGroup>
</Project>

{
  "nbf": 1536394771,
  "exp": 1536398371,
  "iss": "https://localhost:6001",
  "aud": [
    "https://localhost:6001/resources",
    "imagegalleryapi"
  ],
  "client_id": "imagegalleryclient",
  "sub": "d860efca-22d9-47fd-8249-791ba61b07c7",
  "auth_time": 1536394763,
  "idp": "local",  
  "role": "PayingUser",
  "scope": [
    "openid",
    "profile",
    "address",
    "roles",
    "imagegalleryapi"
  ],
  "amr": [
    "pwd"
  ]
}

An unhandled exception occurred while processing the request.
HttpRequestException: Response status code does not indicate success: 401 (Unauthorized).
 System.Net.Http.HttpResponseMessage.EnsureSuccessStatusCode()

        public async Task<IActionResult> Index()
        {
            var httpClient = await _imageGalleryHttpClient.GetHttpClientAsync();
            var response = await httpClient.GetAsync("api/images");

            if (response.StatusCode == System.Net.HttpStatusCode.Unauthorized ||
                response.StatusCode == System.Net.HttpStatusCode.Forbidden)
            {
                return RedirectToAction("AccessDenied", "Authorization");
            }
            response.EnsureSuccessStatusCode();

namespace ImageGallery.WebApi.WebApp.Controllers
{
    [Route("api/images")]
    [Authorize]
    public class ImagesController : Controller
    {
        [HttpGet()]
        public async Task<IActionResult> GetImages()
        {
            var ownerId = this.User.Claims.FirstOrDefault(claim => claim.Type == "sub").Value;

namespace ImageGallery.WebApi.Services
{
    public class ImagesService : IImagesService
    {
        public Task<List<Image>> GetImagesAsync(string ownerId)
        {
            return _images.Where(image => image.OwnerId == ownerId).OrderBy(image => image.Title).ToListAsync();
        }

namespace ImageGallery.WebApi.WebApp.Controllers
{
    [Route("api/images")]
    [Authorize]
    public class ImagesController : Controller
    {
        [HttpGet()]
        public async Task<IActionResult> GetImages()
        {
            var ownerId = this.User.Claims.FirstOrDefault(claim => claim.Type == "sub").Value;
            var imagesFromRepo = await _imagesService.GetImagesAsync(ownerId);
            var imagesToReturn = _mapper.Map<IEnumerable<ImageModel>>(imagesFromRepo);
            return Ok(imagesToReturn);
        }

namespace ImageGallery.WebApi.Services
{
    public class ImagesService : IImagesService
    {
        public Task<bool> IsImageOwnerAsync(Guid id, string ownerId)
        {
            return _images.AnyAsync(i => i.Id == id && i.OwnerId == ownerId);
        }

namespace DNT.IDP
{
    public static class Config
    {
        // api-related resources (scopes)
        public static IEnumerable<ApiResource> GetApiResources()
        {
            return new List<ApiResource>
            {
                new ApiResource(
                    name: "imagegalleryapi",
                    displayName: "Image Gallery API",
                    claimTypes: new List<string> {"role" })
            };
        }

namespace ImageGallery.WebApi.WebApp.Controllers
{
    [Route("api/images")]
    [Authorize]
    public class ImagesController : Controller
    {
        [HttpPost]
        [Authorize(Roles = "PayingUser")]
        public async Task<IActionResult> CreateImage([FromBody] ImageForCreationModel imageForCreation)
        {

var ownerId = User.Claims.FirstOrDefault(c => c.Type == "sub").Value;
imageEntity.OwnerId = ownerId;
// add and save.
await _imagesService.AddImageAsync(imageEntity);

@if(User.IsInRole("PayingUser"))
{
  <li><a asp-area="" asp-controller="Gallery" asp-action="AddImage">Add an image</a></li>
  <li><a asp-area="" asp-controller="Gallery" asp-action="OrderFrame">Order a framed picture</a></li>
}

namespace ImageGallery.MvcClient.WebApp.Controllers
{
    [Authorize]
    public class GalleryController : Controller
    {
        [Authorize(Roles = "PayingUser")]
        public IActionResult AddImage()
        {
            return View();
        }

[HttpPost]
[Authorize(Roles = "PayingUser")]
[ValidateAntiForgeryToken]
public async Task<IActionResult> AddImage(AddImageViewModel addImageViewModel)

    public class Student
    {
        public string FirstName;
        public string LastName;
        public int TotalPointsEarned;

        public void TakeExam(int pointsForExam)
        {
            TotalPointsEarned += pointsForExam;
        }

        public void ExtraCredit(int extraPoints)
        {
            TotalPointsEarned += extraPoints;
        }


        public int PointsEarned { get { return TotalPointsEarned; } }
    }

using System.Collections.Immutable;
using System.Linq;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Diagnostics;
 
namespace CodingStandards
{
    [DiagnosticAnalyzer(LanguageNames.CSharp)]
    public class CodingStandardsAnalyzer : DiagnosticAnalyzer
    {
        public const string DiagnosticId = "CodingStandards";

        // You can change these strings in the Resources.resx file. If you do not want your analyzer to be localize-able, you can use regular strings for Title and MessageFormat.
        internal static readonly LocalizableString Title = new LocalizableResourceString(nameof(Resources.AnalyzerTitle), Resources.ResourceManager, typeof(Resources));
        internal static readonly LocalizableString MessageFormat = new LocalizableResourceString(nameof(Resources.AnalyzerMessageFormat), Resources.ResourceManager, typeof(Resources));
        internal static readonly LocalizableString Description = new LocalizableResourceString(nameof(Resources.AnalyzerDescription), Resources.ResourceManager, typeof(Resources));
        internal const string Category = "Naming";

        internal static DiagnosticDescriptor Rule = 
            new DiagnosticDescriptor(
                DiagnosticId, 
                Title, 
                MessageFormat, 
                Category, 
                DiagnosticSeverity.Error, 
                isEnabledByDefault: true, 
                description: Description);
 
        public override ImmutableArray<DiagnosticDescriptor> SupportedDiagnostics
        {
            get { return ImmutableArray.Create(Rule); }
        }

        public override void Initialize(AnalysisContext context)
        {
            // TODO: Consider registering other actions that act on syntax instead of or in addition to symbols
            context.RegisterSyntaxNodeAction(analyzeFieldDeclaration, SyntaxKind.FieldDeclaration);
        }

        static void analyzeFieldDeclaration(SyntaxNodeAnalysisContext context)
        {
            var fieldDeclaration = context.Node as FieldDeclarationSyntax;
            if (fieldDeclaration == null) return;
            var accessToken = fieldDeclaration
                                .ChildTokens()
                                .SingleOrDefault(token => token.Kind() == SyntaxKind.PublicKeyword);

            // Note: Not finding protected or internal
            if (accessToken.Kind() != SyntaxKind.None)
            {
                // Find the name of the field:
                var name = fieldDeclaration.DescendantTokens()
                              .SingleOrDefault(token => token.IsKind(SyntaxKind.IdentifierToken)).Value;
                var diagnostic = Diagnostic.Create(Rule, fieldDeclaration.GetLocation(), name, accessToken.Value);
                context.ReportDiagnostic(diagnostic);
            }
        }
    }
}

using System.Collections.Immutable;
using System.Composition;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CodeFixes;
using Microsoft.CodeAnalysis.CodeActions;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
 
namespace CodingStandards
{
    [ExportCodeFixProvider(LanguageNames.CSharp, Name = nameof(CodingStandardsCodeFixProvider)), Shared]
    public class CodingStandardsCodeFixProvider : CodeFixProvider
    {
        public sealed override ImmutableArray<string> FixableDiagnosticIds
        {
            get { return ImmutableArray.Create(CodingStandardsAnalyzer.DiagnosticId); }
        }

        public sealed override FixAllProvider GetFixAllProvider()
        {
            return WellKnownFixAllProviders.BatchFixer;
        }

        public sealed override async Task RegisterCodeFixesAsync(CodeFixContext context)
        {
            var root = await context.Document.GetSyntaxRootAsync(context.CancellationToken).ConfigureAwait(false);

            // TODO: Replace the following code with your own analysis, generating a CodeAction for each fix to suggest
            var diagnostic = context.Diagnostics.First();
            var diagnosticSpan = diagnostic.Location.SourceSpan;

            // Find the type declaration identified by the diagnostic.
            var declaration = root.FindToken(diagnosticSpan.Start)
                                   .Parent.AncestorsAndSelf().OfType<FieldDeclarationSyntax>()
                                   .First();

            // Register a code action that will invoke the fix.
            context.RegisterCodeFix(
                CodeAction.Create("Make Private", 
                c => makePrivateDeclarationAsync(context.Document, declaration, c)),
                diagnostic);
        }

        async Task<Document> makePrivateDeclarationAsync(Document document, FieldDeclarationSyntax declaration, CancellationToken c)
        {
            var accessToken = declaration.ChildTokens()
                .SingleOrDefault(token => token.Kind() == SyntaxKind.PublicKeyword);

            var privateAccessToken = SyntaxFactory.Token(SyntaxKind.PrivateKeyword);

            var root = await document.GetSyntaxRootAsync(c);
            var newRoot = root.ReplaceToken(accessToken, privateAccessToken);

            return document.WithSyntaxRoot(newRoot);
        }
    }
}

 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;
                }
            };
        }