Initial Version

ScreenCastR.App/App.razor

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+<CascadingAuthenticationState>
+    <Router AppAssembly="typeof(Startup).Assembly">
+        <NotFoundContent>
+            <p>Sorry, there's nothing at this address.</p>
+        </NotFoundContent>
+    </Router>
+</CascadingAuthenticationState>

ScreenCastR.App/Hub/ScreenCastHub.cs

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+using Microsoft.AspNetCore.SignalR;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace ScreenCastApp
+{
+    public class ScreenCastHub : Hub
+    {
+        private readonly ScreenCastManager screenCastManager;
+        private const string AGENT_GROUP_PREFIX = "AGENT_";
+
+        public ScreenCastHub(ScreenCastManager screenCastManager)
+        {
+            this.screenCastManager = screenCastManager;
+        }
+
+        public async Task AddScreenCastAgent(string agentName)
+        {
+            await Clients.Others.SendAsync("NewScreenCastAgent", agentName);
+            await Groups.AddToGroupAsync(Context.ConnectionId, AGENT_GROUP_PREFIX + agentName);
+        }
+
+        public async Task RemoveScreenCastAgent(string agentName)
+        {
+            await Clients.Others.SendAsync("RemoveScreenCastAgent", agentName);
+            await Groups.RemoveFromGroupAsync(Context.ConnectionId, AGENT_GROUP_PREFIX + agentName);
+            screenCastManager.RemoveViewerByAgent(agentName);
+        }
+
+        public async Task AddScreenCastViewer(string agentName)
+        {
+            await Groups.AddToGroupAsync(Context.ConnectionId, agentName);
+            screenCastManager.AddViewer(Context.ConnectionId, agentName);
+            await Clients.Groups(AGENT_GROUP_PREFIX + agentName).SendAsync("NewViewer");
+        }
+
+        public async Task RemoveScreenCastViewer(string agentName)
+        {
+            await Groups.RemoveFromGroupAsync(Context.ConnectionId, agentName);
+            screenCastManager.RemoveViewer(Context.ConnectionId);
+            if(!screenCastManager.IsViewerExists(agentName))
+                await Clients.Groups(AGENT_GROUP_PREFIX + agentName).SendAsync("NoViewer");
+        }
+
+        public async Task StreamCastData(IAsyncEnumerable<string> stream, string agentName)
+        {
+            await foreach (var item in stream)
+            {
+                await Clients.Group(agentName).SendAsync("OnStreamCastDataReceived", item);
+            }
+        }
+    }
+}

ScreenCastR.App/Pages/Index.razor

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+@page "/"
+
+<ScreenCastView></ScreenCastView>
+
+

ScreenCastR.App/Pages/ScreenCastView.razor

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+@using Microsoft.AspNetCore.SignalR.Client
+
+<div class="card border-primary mb-3" style="max-width: 20rem;">
+    @if (agents.Count > 0)
+    {
+        @foreach (var agent in agents)
+        {
+            <div class="card-body">
+                <div>
+                    <h3 class="badge-primary">
+                        @agent
+                    </h3>
+                    <div style="padding-top:10px">
+                        <button id="ViewCast" disabled="@(IsViewingCastOf(agent))" class="btn btn-success btn-sm" @onclick="@(() => OnViewCastClicked(agent))">
+                            View cast
+                        </button>
+
+                        <button id="StopViewCast" disabled="@(!IsViewingCastOf(agent))" class="btn btn-warning btn-sm" @onclick="@(() => OnStopViewCastClicked(agent))">
+                            Stop cast
+                        </button>
+                    </div>
+                </div>
+            </div>
+        }
+    }
+    else
+    {
+        <div class="card-body">
+            <h3 class="card-header badge-warning">No Screencast Agents casting the screen now!</h3>
+        </div>
+    }
+</div>
+<div class="border">
+    <img id='screenImage' src="@imageSource" />
+</div>
+@code{
+
+    private List<string> agents = new List<string>();
+
+    HubConnection connection;
+    string imageSource = null;
+    string CurrentViewCastAgent = null;
+
+    protected async override Task OnInitializedAsync()
+    {
+        connection = new HubConnectionBuilder()
+        .WithUrl("https://localhost:5001/ScreenCastHub")
+        .Build();
+
+        connection.On<string>("NewScreenCastAgent", NewScreenCastAgent);
+        connection.On<string>("RemoveScreenCastAgent", RemoveScreenCastAgent);
+        connection.On<string>("OnStreamCastDataReceived", OnStreamCastDataReceived);
+
+        await connection.StartAsync();
+    }
+
+    bool IsViewingCastOf(string agentName)
+    {
+        return agentName == CurrentViewCastAgent;
+    }
+
+    void NewScreenCastAgent(string agentName)
+    {
+        agents.Add(agentName);
+        StateHasChanged();
+    }
+
+    void RemoveScreenCastAgent(string agentName)
+    {
+        agents.Remove(agentName);
+        imageSource = null;
+        CurrentViewCastAgent = null;
+        StateHasChanged();
+    }
+
+    void OnStreamCastDataReceived(string streamData)
+    {
+        imageSource = streamData;
+        StateHasChanged();
+    }
+
+    private async Task OnViewCastClicked(string agentName)
+    {
+        CurrentViewCastAgent = agentName;
+        await connection.InvokeAsync("AddScreenCastViewer", agentName);
+    }
+
+    private async Task OnStopViewCastClicked(string agentName)
+    {
+        CurrentViewCastAgent = null;
+        await connection.InvokeAsync("RemoveScreenCastViewer", agentName);
+        imageSource = null;
+        StateHasChanged();
+    }
+
+}

ScreenCastR.App/Pages/_Host.cshtml

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+@page "/"
+@namespace ScreenCastApp.Pages
+@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
+
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>ScreenCastApp</title>
+    <base href="~/" />
+    <link rel="stylesheet" href="css/bootstrap/bootstrap.min.css" />
+    <link href="css/site.css" rel="stylesheet" />
+</head>
+<body>
+    <app>@(await Html.RenderComponentAsync<App>())</app>
+
+    <script src="_framework/blazor.server.js"></script>    
+</body>
+</html>

ScreenCastR.App/Pages/_Imports.razor

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+@layout MainLayout

ScreenCastR.App/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace ScreenCastApp
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateHostBuilder(args).Build().Run();
+        }
+
+        public static IHostBuilder CreateHostBuilder(string[] args) =>
+            Host.CreateDefaultBuilder(args)
+                .ConfigureWebHostDefaults(webBuilder =>
+                {
+                    webBuilder.UseStartup<Startup>();
+                });
+    }
+}

ScreenCastR.App/ScreenCastApp.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.0</TargetFramework>
+    <LangVersion>preview</LangVersion>
+  </PropertyGroup>
+
+  <ItemGroup>    
+    <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="3.0.0-preview8.19405.7" />            
+  </ItemGroup>
+</Project>

ScreenCastR.App/ScreenCastApp.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29123.89
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ScreenCastApp", "ScreenCastApp.csproj", "{EA66AEBB-72BB-4A5D-993C-54D730BD1685}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{EA66AEBB-72BB-4A5D-993C-54D730BD1685}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{EA66AEBB-72BB-4A5D-993C-54D730BD1685}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{EA66AEBB-72BB-4A5D-993C-54D730BD1685}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{EA66AEBB-72BB-4A5D-993C-54D730BD1685}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {FB84BC4E-D93B-4E22-AC9D-8EC420AFDAF3}
+	EndGlobalSection
+EndGlobal

ScreenCastR.App/ScreenCastManager.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace ScreenCastApp
+{
+    public class ScreenCastManager
+    {
+        private List<Viewer> viewers = new List<Viewer>();
+
+        public void AddViewer(string connectionId, string agentName)
+        {
+            viewers.Add(new Viewer(connectionId, agentName));
+        }
+
+        public void RemoveViewer(string connectionId)
+        {
+            viewers.Remove(viewers.First(i => i.ConnectionId == connectionId));
+        }
+
+        public void RemoveViewerByAgent(string agentName)
+        {
+            viewers.RemoveAll(i => i.AgentName == agentName);
+        }
+
+        public bool IsViewerExists(string agentName)
+        {
+            return viewers.Any(i => i.AgentName == agentName);
+        }
+
+    }
+
+    internal class Viewer
+    {
+        public string ConnectionId { get; set; }
+        public string AgentName { get; set; }
+
+        public Viewer(string connectionId, string agentName)
+        {
+            ConnectionId = connectionId;
+            AgentName = agentName;
+        }
+    }
+}

ScreenCastR.App/Shared/MainLayout.razor

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+@inherits LayoutComponentBase
+
+<div class="sidebar">
+    <NavMenu />
+</div>
+
+<div class="main">    
+    <div class="content px-4">
+        @Body
+    </div>
+</div>

ScreenCastR.App/Shared/NavMenu.razor

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+<div class="top-row pl-4 navbar navbar-dark">
+    <a class="navbar-brand" href="">ScreenCastR </a>
+    <button class="navbar-toggler" @onclick="ToggleNavMenu">
+        <span class="navbar-toggler-icon"></span>
+    </button>
+</div>
+
+@code {
+    bool collapseNavMenu = true;
+
+    string NavMenuCssClass => collapseNavMenu ? "collapse" : null;
+
+    void ToggleNavMenu()
+    {
+        collapseNavMenu = !collapseNavMenu;
+    }
+}

ScreenCastR.App/Startup.cs

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+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+
+namespace ScreenCastApp
+{
+    public class Startup
+    {
+        public Startup(IConfiguration configuration)
+        {
+            Configuration = configuration;
+        }
+
+        public IConfiguration Configuration { get; }
+
+        // This method gets called by the runtime. Use this method to add services to the container.
+        // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
+        public void ConfigureServices(IServiceCollection services)
+        {
+            services.AddRazorPages();
+            services.AddServerSideBlazor();
+            services.AddSignalR().AddHubOptions<ScreenCastHub>(options => { options.MaximumReceiveMessageSize = 102400000; });
+            services.AddSingleton<ScreenCastManager>();
+        }
+
+        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
+        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+        {
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+            }
+            else
+            {
+                app.UseExceptionHandler("/Home/Error");
+                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
+                app.UseHsts();
+            }
+
+            app.UseHttpsRedirection();
+            app.UseStaticFiles();
+
+            app.UseRouting();
+
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapBlazorHub();
+                endpoints.MapFallbackToPage("/_Host");
+                endpoints.MapHub<ScreenCastHub>("/ScreenCastHub");
+            });
+        }
+    }
+}

ScreenCastR.App/_Imports.razor

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+@using System.Net.Http
+@using Microsoft.AspNetCore.Authorization
+@using Microsoft.AspNetCore.Components.Forms
+@using Microsoft.AspNetCore.Components.Routing
+@using Microsoft.JSInterop
+@using ScreenCastApp
+@using ScreenCastApp.Shared