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Home > Web Development > Server Side Web Development > SignalR Blueprints
SignalR Blueprints
SignalR Blueprints

SignalR Blueprints: Build real-time ASP.NET web applications with SignalR and create various interesting projects to improve your user experience

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SignalR Blueprints

Chapter 2. Overheating the Discussion

This chapter will cover the basics of getting started with SignalR and at the same time will show the potential to improve the user experience in a simple way. We will begin with something simple, which is making your own forum discussion site. As a consequence of creating this, you will learn more about the following topics:

  • Using simple ASP.NET MVC 5
  • Enabling security
  • Using simple jQuery
  • Using Entity Framework 6
  • Utilizing a hub
  • Using SignalR groups

The goal – how to create a basic forum discussion site

Forums have been around since the dawn of computing, taking on many forms: bulletin board systems, user groups, and also web-based forums on different sites. In this chapter, we'll build our own forum and light it up with SignalR, improving the overall user experience and also scalability of the solution. We'll use the top-level abstraction within SignalR called a hub. The hub enables us to expose methods from the server directly to the client and also makes it possible to call functions on the client side from the server directly.

By the end of the chapter, you'll understand the basics of SignalR and how to use the top-level abstraction: hub. Also, you will briefly look at what MVC gives you in combination with Entity Framework.

So, let's just jump straight into it!

Hub

At the core level of SignalR sits something called a PersistentConnection class; hubs build on top of this. We won't be covering PersistentConnection...

Getting started – creating an MVC template

Firstly, you'll need to open up your Visual Studio installation and create a new project by clicking on New Project from the File menu. The following dialog box will show up. Click on Web from the left-hand side menu and then select ASP.NET Web Application. Enter Chapter2 in the Name textbox and select your location, as shown in the following screenshot:

Getting started – creating an MVC template

As we want to create an MVC app, select the MVC template from the template selector and make sure you deselect the Host in the cloud option. Before clicking on OK, click on the Change Authentication button, as shown in the following screenshot:

Getting started – creating an MVC template

As you can see from the following screenshot, a dialog box will pop up. Make sure the Individual User Accounts option is selected and click on OK, followed by OK in the template selector dialog box you came from:

Getting started – creating an MVC template

You now have your MVC template created, which enables authentication with its own user database. The foundation has been set!

Creating...

Preparing our web application for SignalR

We now have the dependencies set up as required so all we need now is to prepare our web application for SignalR.

Making your SignalR hubs available for the client

Any hubs that we create need to be exposed to any connecting client so that they can be used. Let's start by exposing any SignalR hubs that we add from this point to automatically be available for our client. Open up the Startup.cs file. At the bottom of the Configuration method, we need to add a call to map any SignalR hubs, as shown in the following code:

public void Configuration(IAppBuilder app)
{
ConfigureAuth(app);
App.MapSignalR();
}

Note

It's possible to specify a base URL in the MapSignalR() method call that enables you to expose SignalR at whichever route you see fit.

By default, SignalR uses something called Open Web Interface for .NET (OWIN) and it needs to be told what the starting point is. Notice this is at the top of the Startup.cs file, above the namespace declaration...

How to create your UI for threads on your forum

Let's go back to the Index.cshtml view that was added to the Views/Forum folder and start building the user interface for the thread view and creation of new threads. Start by changing the headline from Index to All threads by finding the <h2> tag close to the top of the file, as shown here:

<h2>All threads</h2>

Creating the thread list – adding a table

Now, we want to add a table that will serve as the thread list, and yes it actually is a good use of the table. In HTML, table was abused for years to deal with layout instead of being used for listings like this. We use bootstrap CSS classes to make it look good. Add the following code right after the <h2> headline:

<table class="table table-bordered table-striped table-condensed table-hover">
<thread>
<tr>
   <th>Title</th>
   <th>Started</th>
      <th>Started by</th>
      <th>Last post...

Our first hub – threads

Now that we have our data access layer and the models in place, we want to expose our first SignalR hub, enabling us to actually work with this from the client. At the root of the project, add a folder called Hubs, and inside this folder, create another folder called Forum. In this folder, we want to add a C# class called ThreadHub.cs. Start by adding the following code in it:

using System;
using System.Collections.Generic;
using System.Linq;
using Chapter2.DAL;
using Chapter2.Models.Forum;
using Microsoft.AspNet.SignalR;

namespace Chapter2.Hubs.Forum
{
    public class ThreadHub : Hub
    {
        ForumContext _forumContext;
        
        public ThreadHub()
        {
            _forumContext = new ForumContext();
        }
        
        protected override void Dispose(bool disposing)
        {
            if (disposing) 
            {
               _forumContext.Dispose();
            }
            base.Dispose(disposing)
        }
    }
}

Note

Being...

The detail view – posts on specific threads

Now that we have a list of threads, it's time to enable us to view a single thread and its posts. We want to click an item in the thread list and then be taken to a view that shows the content in the form of posts for this thread.

Navigating to a thread to see the posts

With a functional thread list, we now want to create the view to click a thread in the list. Let's start by adding another controller action that will take us to the view. Open the ForumController.cs file in the Controllers folder. Add the following method at the bottom of the class:

public ActionResult Thread(int id)
{
return View();
}

The Thread action needs a Thread view. Add, as before, a view by right-clicking on the Forum folder sitting in the Views folder of the project and select View from Add. Name it Thread, leave the defaults, and then click on Add.

Adding the view content for a thread

The new Thread view will be similar to what we had for the Index view,...

Summary

In this chapter, we've scratched the surface of SignalR, but you already should get a sense of the power of thinking differently about how you build your applications by creating your own simple discussion forum. The fact that we just define methods in C# and these are automatically accessible from the client code through the generated proxies makes it really productive to work with. It basically bridges the gap between the client and the server. What you'll notice is that we managed to actually create a forum that works, deploying the latest and greatest of technologies in the ASP.NET space in very little code.

Tip

You can find the entire sample code at https://github.com/dolittle/SignalR_Blueprints/tree/master/Source/Chapter2.

In the next chapter, we'll dive into how this real-time thinking can go even further and how to deal with scale. By taking another common real-world sample and online newspapers, we'll see how you can deploy SignalR to improve things for...

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Description

This book is designed for software developers, primarily those with knowledge of C#, .NET, and JavaScript. Good knowledge and understanding of SignalR is assumed to allow efficient programming of core elements and applications in SignalR.

Who is this book for?

This book is designed for software developers, primarily those with knowledge of C#, .NET, and JavaScript. Good knowledge and understanding of SignalR is assumed to allow efficient programming of core elements and applications in SignalR.

What you will learn

  • Discover how to use SignalR with ASP.NET MVC 5
  • Learn how to apply security to your applications
  • Understand the significance of publish and subscribe models
  • Discover the wonders of ModelViewViewModel as a frontend pattern
  • Learn how to decouple your applications and really apply the SOLID principles
  • Deploy SignalR and realtime thinking to the mobile space through Windows Phone 8.1 RT
  • Apply Domain Driven Design through Command Query Responsibility Segregation

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Feb 25, 2015
Length: 244 pages
Edition : 1st
Language : English
ISBN-13 : 9781783983131
Category :
Web Development
Languages :
C#
Concepts :
Server Side Web Development
Tools :
SignalR

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Product Details

Publication date : Feb 25, 2015
Length: 244 pages
Edition : 1st
Language : English
ISBN-13 : 9781783983131
Category :
Web Development
Languages :
C#
Concepts :
Server Side Web Development
Tools :
SignalR

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Table of Contents

11 Chapters
1. The Primer Chevron down icon Chevron up icon
1. The Primer
Where are we coming from?
Terminology
Patterns
Libraries and frameworks
Making it look good – using Twitter bootstrap
Tools
Summary
2. Overheating the Discussion Chevron down icon Chevron up icon
2. Overheating the Discussion
The goal – how to create a basic forum discussion site
Getting started – creating an MVC template
Preparing our web application for SignalR
How to create your UI for threads on your forum
Our first hub – threads
The detail view – posts on specific threads
Summary
3. Extra! Extra! Read All About It! Chevron down icon Chevron up icon
3. Extra! Extra! Read All About It!
The goal – how to bring to life an imagined news site
Getting started – creating an MVC template
Creating the models
Putting in place the Data Access Layer
The look and feel
The magic code
The newsroom
Finding the needle in the haystack
Master/detail – navigation
Summary
4. Can You Measure It? Chevron down icon Chevron up icon
4. Can You Measure It?
The goal – an imagined dashboard
Decoupling it all
Back to basics
Knocking it out of the park
Our single page
The server side of things
Bringing it all back to the client
Trying it all out
Summary
5. What Line of Business Are You In? Chevron down icon Chevron up icon
5. What Line of Business Are You In?
The goal – a simple line of business
Decoupling – the next level
Proxy generation
Composing the UI
Convention over configuration
Getting assimilated
Composing
Concurrency and staleness
Summary
6. An Architectural Taste Chevron down icon Chevron up icon
6. An Architectural Taste
The goal – banking
Where does it all start?
Structure
Command Query Responsibility Segregation
Accounts overview
Summary
7. The Three Screens – Mobile First Chevron down icon Chevron up icon
7. The Three Screens – Mobile First
XAML
The goal – mobile banking
Accounts
Summary
8. Putting the X in .NET – Xamarin Chevron down icon Chevron up icon
8. Putting the X in .NET – Xamarin
The goal – rinse and repeat
Features
Summary
9. Debugging or Troubleshooting Chevron down icon Chevron up icon
9. Debugging or Troubleshooting
Logging
Going deeper
Summary
10. Hosting and Deployment Chevron down icon Chevron up icon
10. Hosting and Deployment
Self-hosting
Scaling out
Summary
Index Chevron down icon Chevron up icon
Index

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About the author

Profile icon Einar Ingerbrigsten
Einar Ingerbrigsten
LinkedIn icon Github icon
Einar Ingebrigtsen has been working professionally with software since 1994—ranging from games development on platforms such as PlayStation, Xbox, and the PC to the enterprise line of business application development since 2002. He has always focused on creating great products with great user experiences, putting the user first. Einar was a Microsoft MVP awardee from October 2008 until July 2015, which he was awarded for his work in the community and in the Silverlight space with open source projects such as Balder, a 3D engine for Silverlight. For years, Einar ran a company called Dolittle together with partners, doing consultancy work and building their own products with their own open source projects at the heart of what they did. Amongst the clients that Dolittle has had over the last couple of years include NRK (the largest TV broadcaster in Norway), Statoil (a Norwegian oil company), Komplett (the largest e-commerce company in Norway), and Holte (a leading Norwegian developer for construction software). Today, Einar works for Microsoft as a technical evangelist, focusing on Azure and advising ISVs, which meant giving up the MVP title. A strong believer in open source, he runs a few projects in addition to Balder, the largest being Bifrost ( http://bifr.st), a line of business platforms for .NET developers, and also worth mentioning is Forseti ( http://github.com/dolittle/forseti), a headless auto-running JavaScript test runner. Additionally, Einar loves talking at user groups and conferences and has been a frequent speaker at Microsoft venues, talking about different topics—the last couple of years he has mostly focused on architecture, code quality, and cloud computing. His personal blog is at http://www.ingebrigtsen.info. Einar has also published another book on the subject of SignalR Blueprints, by Packt Publishing.
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