First time here? You are looking at the most recent posts. You may also want to check out older archives or the tag cloud. Please leave a comment, ask a question and consider subscribing to the latest posts via RSS. Thank you for visiting! (hide this)

Web European Conference Registrations opens 1st July 12:00CET

title

The moment has finally come: tomorrow at midday, Central European Time, it will be possible to start registering for the 2nd Web European Conference.

In the previous edition of the conference we sold out all the tickets available at the time (170) in the first few hours after opening: this year we’ll have 400 seats, but just to be sure, remember to set an alarm and get to the registration page on time not too loose the option to take part in the conference.

Register for the Web European Conference

Speakers and session

Tomorrow we’ll also close the Call for Presenters, and we’ll also ask for your opinion on which sessions to include in the conference: you can already see all the proposals on out github repository and from tomorrow you’ll be able to vote for your favorite sessions.

But we have already our two TOP speakers: Scott Hanselman and Dino Esposito.

speakers

 

Sponsors

A final word on our sponsors and partners, without whom this conference will not be possible.

sponsors

 

CodeGarden 2015: recap of day 1

Here I am again, for the third time at Umbraco CodeGarden. For those who do not know what it is, it's the yearly Umbraco developer conference, this year celebrating its 10th anniversary.

Before going to sleep after a long day I just wanted to post my recap of the day.

The Keynote

CodeGarden Keynote

Some numbers on the "size" of the community:

  • almost 200k active developers on the community site
  • almost 300k active public installation of Umbraco
  • over 200k installation of Umbraco v7 in the last year

In addition to giving all these figures, Niels also highlighted some popular packages contributed by the community (Vorto for 1 to 1 translations, NuPicker and Nested Contents for enhanced editors experience, LePainter a visual grid editor and BookShelf to provide inline contextual help to the backoffice).

Other announcements included the features that are coming with v7.3 (automatic load balancing, a new API library as first path to get rid of legacy API, authentication based on ASP.NET Identity, which enables twitter, Google, Active Directory and 2 factor authentication via Google) and future features that are currently being experimented like the new cache layer, a new content type editor and a full-fledged REST API based on the HAL standard.

Roadmap panel

Immediately after the keynote, 5 members of the core dev team answered questions on specific pain-points that users would like addressed in future (v8) releases, and also unveiled HQ's priorities:

  • Improving the UX
  • Fresh start on the code (getting rid of the decennial original legacy API)
  • Bringing many features of Umbraco.com (the SaaS platoform) to on-premises installations (like migrations from environments, syncronization of content and so on)
  • Segmentation, segments-based content variations and personalization

Contributing to the core

After the usual organic lunch, the afternoon started with some Git tips to better contribute to the core of Umbraco and make maintainers' life easier:

  • First squash all commits into one, making sure no typos or "missed file" kind of commits are sent in the pull request. The suggestion was to use the git rebase --interactive command.
  • Then making sure our pull request is based on a pretty recent version of the repository, using the following process:
    • Track upstream git remote add upstream ...
    • Fetch upstream git fetch upstream
    • Rebase your commit on top of the latest version of the repo git rebase upstream/dev-7
  • And finally, merge all the conflicts that might arise before doing the pull request

Make Editors Happy

As last year, one of the main tenet of the conference is reminding us developers that also content editors deserve love, and with Umbraco 7 it's very easy to craft data editors tailored to custom editing expectations and flows. But even without going down the path of customization with AngularJS, many things can be done also with the core editors and a few selected packages: group properties in tabs, remove from the RTE everthing tha editors do not need, provide contextual help (maybe consider the uEditorNotes package) and finally use NuPicker and Nested Content to provide a better experience when choosing node from the tree and when creating list of items.

How to sell Umbraco

The day ended with an amazing talk by Theo Paraskevopoulos with tips on how to sell Umbraco as platform when doing projects. Unfortunately the slides are not published yet, but will update the post as soon as they are.

Some impressive facts I didn't know about: NFL uses Umbraco for one of they sub-sites (http://operations.NFL.com) and Umbraco, with 0,7%, is the 5th platform in term of marketshare in the industry of CMS, after WordPress, Drupal, Joomla and DotNetNuke (1%); all the rest of the CMS account for 1.4%.

Conclusion

The evening ended with a protest march through the streets of Copenhagen, which unfortunately I had to miss due to a broken toe, caused by an injury in a recent triathlon race.

The first day was not super-tech, but more soft-skill and UX oriented, but very useful anyway, especially for me since my reason to be here is to get a feeling of where Umbraco is going in the future to see if it can be used as CMS platform at my workplace.

Tomorrow it looks like a more tech-focused agenda.

NBAs soon as slides and video are published, I'll update the post.

My new free eBook is out: OWIN Succinctly by Syncfusion

image I’m happy to announce that my latest book, OWIN Succinctly, has just been released by Syncfusion, within their “succinctly” series of eBooks.

I’ve written this book together with my friend and co-organizer of the 2nd Web European Conference, Ugo Lattanzi, with whom I’ve also give a speech in Paris last May, still about Owin.

Owin is a big inspiration for the new ASP.NET 5 stack, so we decided to write this book both to show how you can use this “philosophy” with current version of the ASP.NET, and to let you know how it could be in the future with ASP.NET 5.

The book covers all aspects of OWIN, starting with a description of the OWIN specification, moving on to how Katana, Microsoft’s implementation of the specs, works. Later we also show how to use Katana with various web frameworks, how to use authentication and finally how to write custom middleware.

The table of contents is:

  • OWIN
  • Katana
  • Using Katana with Other Web Frameworks
  • Building Custom Middleware
  • Authentication with Katana
  • Appendix

OWIN, and the new ASP.NET will be big actors in the 2nd Web European Conference in Milano next 26th of September, so, if you want to know more about those technologies, consider participating to the conference.

A big “thank you” goes to Syncfusion, for giving us the possibility to reach their audience, and to our technical reviewer Robert Muehsig, whose comments helped making the book even better.

If you have comments or feedback on the book, do not hesitate to write a comment on this post, or contacting me on twitter @simonech.

Using Entity Framework within an Owin-hosted Web API with Unity

After quite a lot of time of writing applications without direct interaction with Databases, lately I’ve been working on a pretty simple ASP.NET Web API project that needs to save data on a database. Despite the simplicity of the application, I faced some interesting problems, which I’m going to write about in a few blog posts over the next weeks.

The first of the problems, which I’m going to write about in this post, is how to configure an ASP.NET Web API application to run within Owin, have its dependencies resolved with Unity, and have Entity Framework DbContext injected via IoC/DI.

Setting up ASP.NET Web API with Owin

The first thing to do is getting the right packages:

  • first create a new ASP.NET Web Application, choose the Empty template, and tick the Web API option under “Add folders and core references for”: this will install all the Nuget packages needed for a Web API project, and will setup the folder structure;
  • then you need to install the Owin packages and the Owin-Web API “bridge”: by installing the Microsoft.AspNet.WebApi.Owin you’ll get everything you need;
  • finally, depending on where/how you want to run the Web API project, you also need the Nuget package for the Owin server you need: download Microsoft.Owin.Host.SystemWeb for starter if you want your app to run within IIS.

Once all the core dependencies are ready, you have to configure the Owin Startup class to fire up Web API: just add a OWIN Startup class from Visual Studio contextual menu and add to the Configuration method the right configuration for Web API.

public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        HttpConfiguration config = new HttpConfiguration();
        // ... Configure you web api routes
        app.UseWebApi(config);
    }
}

And Voilá! You have a Web API running with an Owin host.

Adding Unity to Web API within Owin

Next step is adding Unity and configuring it to correctly resolve dependencies in a Web API application. Just add the Unity.AspNet.WebApi Nuget package and all the needed packages and bootstrapping code will be added to the project: in particular it will add two important files:

  • UnityConfig class, where the configuration of the Unity container should go
  • UnityWebApiActivator class, which is fired up using WebActivator, that registers the unity dependency resolver for Web API (by saving into the GlobalConfiguration.Configuration object)

Unfortunately, if you run you application now (and you have already some dependencies injected into your controllers via IoC/DI) nothing will be injected, simple because the DependencyResolver is still empty, despite being set by the Start method of the UnityWebApiActivator: this works fine in a normal Web API application, but not with Owin, because of the sequence in which the various services are instantiated.

The solution to the problem is pretty easy : just delete the UnityWebApiActivator class and put the same code into the Owin configuration method:

public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        HttpConfiguration config = new HttpConfiguration();

        // ... Configure you web api routes
        config.DependencyResolver = new UnityDependencyResolver(UnityConfig.GetConfiguredContainer());

        app.UseWebApi(config);
    }
}

For reference, the UnityConfig.GetConfiguredContainer is a static method exposed by the UnityConfig class that has been added with the Unity bootstrapper for ASP.NET Web API nuget package, and looks like the following snippet (the part within region is added by the package, the method RegisterTypes is the one we need to configure our Unity container):

/// <summary>
/// Specifies the Unity configuration for the main container.
/// </summary>
public class UnityConfig
{
    #region Unity Container
    private static Lazy<IUnityContainer> container = new Lazy<IUnityContainer>(() =>
    {
        var container = new UnityContainer();
        RegisterTypes(container);
        return container;
    });

    /// <summary>
    /// Gets the configured Unity container.
    /// </summary>
    public static IUnityContainer GetConfiguredContainer()
    {
        return container.Value;
    }
    #endregion

    public static void RegisterTypes(IUnityContainer container)
    {
        container.RegisterType<IUserRepository, MyUserRepository>();
    }
}

And now also Unity is wired up correctly and dependencies resolved.

Having Entity Framework DbContext injected via Unity

Let’s get now to the juicy bits: how do we configure Unity to inject EF6 DbContext so that a new context is created with each request? On the internet there are a lot of samples of how to do it, as this is a very common pattern used with all “heavy” ORMs, but all of them use other IoC/DI frameworks, like Ninject, StructureMap and so on, but none with Unity.

Unity doesn’t have a InRequestScope/PerRequest object-scope as most other IoC/DI, but is has something slightly different, called HierarchicalLifetimeManager: it basically creates a “singleton” for each child Unity container created. While being kind of strange, in reality it gives a bit more of flexibility as someone could create child containers for different occasions: which exactly what the Unity bootstrapper for ASP.NET Web API does: it introduces a new kind of DependencyResolver called UnityHierarchicalDependencyResolver that creates a new child container with every begin request.

Taking into consideration all the steps considered so far, here is the final Owin configuration method:

public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        HttpConfiguration config = new HttpConfiguration();
        
        // ... Configure you web api routes

        config.DependencyResolver = new UnityHierarchicalDependencyResolver(UnityConfig.GetConfiguredContainer());
        
        app.UseWebApi(config);
    }

}

and the Unity registration:

public static void RegisterTypes(IUnityContainer container)
{
    container.RegisterType<IUserRepository, MyUserRepository>();
    container.RegisterType<MyDBContext>(new HierarchicalLifetimeManager());
}

The last line is important, because if you forget to specify it, a new DbContext will be injected in each of your repositories/command/query objects, you'll not be able to share the context and everything will fall apart.

Wrapping up

Once you solve a few pitfalls (the GlobalConfiguration not being “seen” by the Owin-hosted Web API and the configuration of the “Per Request” scope with Unity), the setup of the infrastructure is pretty easy and is implemented in just 2 lines of code.

Hope this helps, and please let me know if you solved the problem with a different approach or if my solution misses something. And I’ll write a few more posts with my findings in the next weeks.

How to unset a proxy for a specific git repository or remote

In this post I’ll show something that I just discovered and solved a problem I had once we introduced a in-house git repository: how to have many git repositories using proxies but have one that connects directly without proxy.

Lately we moved our source code repository, from a “standard” TFS repo to the git-based TFS repository that has been introduced with TFS 2013. Besides working with github repositories, now I had to connect also to some a repository hosted inside the local network and authenticate using the local domain credentials.

All went well from within Visual Studio, but since you cannot do everything from VS, I also needed to connect to the internal repository via the git command line tools. The problem is that it didn’t connect.

After a bit of troubleshooting I realized that the problem was the proxy: I’m behind a corporate firewall, so I had to configure a proxy to connect to github. Unfortunately the proxy was not recognizing my connection as local, so was trying to resolve it on the internet, and of course it failed.

I had to remove the proxy configuration, and I could connect to my local git-based TFS repository, but I couldn’t connect to the other repositories unless I specified the proxy on each of the repositories that needed it, which was kind of tedious since I need proxy for all repos except one.

Looking through the git-config documentation I found the solution:

Set to the empty string to disable proxying for that remote.

This not only work when specifying a proxy for a specific remote, but also for the whole repository.

Without further ado, here are the command for this configuration.

First you specify your global proxy configuration

$ git config --global --add http.proxy "http://proxy.example.com"

Then you move to the repository for which you want to unset the proxy and add an "empty" proxy.

$ git config --local --add http.proxy ""

And in case you need to specify an empty proxy only for a specific remote

$ git config --local --add remote.<name>.proxy ""

It took me a day to understand the cause of the problem, hope this post will help other people in a similar situation.

Tags: , ,

Using web api client in synchronous methods and some good async/await resources

Lately I’ve been trying to include a call to a REST service using the WebAPI client to a library already used from inside both an ASP.NET page and a WCF service.

The problem with mixing sync and async

Of course I started with an async/await code:

HttpResponseMessage response = await client.PostAsJsonAsync(GetUpdateUri(), payload);

Unfortunately both consumers were synchronous, so I had to wait for the async to complete before going on with the execution: so I did something that proved to be wrong (the following methods calls the line above):

SendPayloadAsync(payload).Wait();

Deadlock: this never completes as ASP.NET is blocking the context thread waiting for the webapi call to complete, which waits for the thread to be free so it can complete.

How to make a synchronous web api call

What I should have done, instead, would have been to change the ASP.NET page to be an async page (using the Page.RegisterAyncTask) and also change the WCF service to be async, and use the async/await from top to bottom as is best practice. In my case it was too complex and would have required touching code developer by others and already working, so I simply avoided starting the “async chain”:

HttpResponseMessage response = client.PostAsJsonAsync(GetUpdateUri(), payload).Result;

Async/Await resources

On the other end I realized I don’t know enough about the async way of coding, and I spent some time reading some good references, mostly by “async-guru” Stephen Cleary.

How to roll log files at the beginning of the day using Enterprise Library logging block

It took me a while to find out the (very simple) solution to my problem, so I thought it would have been a good idea to create a post explaining it.

The problem

I’m logging from my application using Enterprise Library Logging component, and I wanted to have a new file every day. So I configured the logger with the RollingFlatFileTraceListener. One of the properties you can specify during the registration is the rollInterval attibute, which configures the log to roll every minute, hour, day, week, month, year.

I wanted to have a new file every day, so I specified “day”: I got a new file per day, but the rolling was happening at “random” times during the day. Actually it was not really random: the rolling time was moving forward by a few minutes every day.

The solution

After looking around and finding nothing I looked by mistake at the docs of v5. They said:

Remarks:

Logging always occurs to the configured file name, and when roll occurs a new rolled file name is calculated by adding the timestamp pattern to the configured file name.

The need of rolling is calculated before performing a logging operation, so even if the thresholds are exceeded roll will not occur until a new entry is logged.

Both time and size thresholds can be configured, and when the first of them occurs both will be reset.

The elapsed time is calculated from the creation date of the logging file.

Here everything is explained: the elapsed time is a day from the creation of the file, and the actual moment in which the new file is created is the next log entry after that 24 hours.

I also found out that the rollInterval property is based on an enum, RollInterval,  which contains also another element that I had previously overlooked: Midnight. This makes the file to roll at the beginning of each day, instead of every 24 hours.

Don’t miss Connect(); a virtual conference about Visual Studio vNext

I just came back from the Microsoft MVP summit, where they announced (to MVPs) lots of interesting news about the future of web development with .NET: many were already well known like the new ASP.NET vNext and ASP.NET MVC 6, but other were pretty new also for us MVPs. Unfortunately, despite being super-excited about them, I cannot tell you anything as everything is under NDA.

I can tell you though that this Wednesday and Thursday, there will be a virtual developer conference, Connect();, where many of the news will be revealed to the World.

Specifically, on Wednesday 12th November, Scott Guthrie, “Soma” and Scott Hanselman will give their keynotes. The following day will be a more technical day, with sessions with product team members.

Hopefully there will be recordings for people that due to the time zone differences could not attend.

How to get integrated debugging in Visual Studio with OwinHost in Owin-based Katana web applications

In this blog post I want to share with you an hidden feature of Visual Studio 2013 that enables an integrated debugging experience with OwinHost and other custom hosts.

Options when building Owin-based apps

When you build an Owin-based web application with Katana you have 3 hosting options:

  • Use the System.Web Host, build your app as Web Application and run/debug it inside IIS Express from within Visual Studio;
  • Build your own custom host, build your app as Console Application and run/debug it as custom console application;
  • Use the OwinHost host that is part of the Katana suite, and build your app as Class Library and run it by manually launching the OwinHost.exe app from within the current project folder.

How to debug an Owin-based app running within OwinHost

In the third option I left out debug on purpose, it was not a mistake. This is because debugging an Owin app that is running in OwinHost is not as straightforward as the other 2 options:

  • First you have to make sure the project is always built into the \bin folder instead of \bin\Debug or \bin\Release as otherwise OwinHost will not work (by default it looks for classes inside the \bin folder);
  • Then you have to manually launch the OwinHost executable pointing to the folder in which it was installed by Nuget when you downloaded it (typically it would be ..\packages\OwinHost.(version)\tools\OwinHost.exe, and with the just released version, ..\packages\OwinHost.3.0.0\tools\OwinHost.exe)
  • And finally, if you want to debug the application, you have to attach the debugger to the process , and launch the browser manually.

Not a complicate procedure, but time consuming.

Introducing Visual Studio integration for external hosts

Visual Studio 2013 adds the possibility, in addition to the usual IIS Express and Local IIS, to launch a Web Application with a external url or by specifying an external hosting process. And the OwinHost nuget package takes advantage of this and when you install it within a Web Application project it also registers itself as additional custom host (here below the important part of the powershell install script in the nuget package):

$serverProvider = $dte.GetObject("CustomWebServerProvider")
$servers = $serverProvider.GetCustomServers($project.Name)
$servers.AddWebServer('OwinHost', $exeDir, '-u {url}', 'http://localhost:12345/', '{projectdir}')

This adds the following line to the .csproj file:

<servers defaultServer="OwinHost">
  <server name="OwinHost"
   exePath="{solutiondir}\packages\OwinHost.3.0.0\tools\OwinHost.exe"
   cmdArgs="-u {url}"
   url="http://localhost:12345/"
   workingDir="{projectdir}" />
</servers>

In concrete what you get is a new entry in the Servers dropdown list in the Web tab of the Server Properties window of your web application project.

Project Properties Window, Web tab

But since this option is only available inside a Web Application project, you have to create your application using the Empty template of a Web Application project and remove all the unneeded project references that come with Web Application projects, like System.Web for example.

But once the references are cleaned up (and you have to do it only once), you can just hit F5 or press the “Debug” button and OwinHost will fire-up loading your Owin startup class, your browser will start to the right url, and the debugger will be already attached to the process, just like with IIS hosted apps.

Compatibility issues

This new feature only works with Visual Studio 2013, so if you want to open the same project also in VS 2012 do not install it otherwise the project will not load (the Nuget Manager will ask you if you want to install the server extension or not).

Announcing the 2nd Web European Conference, next Spring, in Italy

We did it in October 2012, and we are doing it again: we are organizing the 2nd Web European Conference for Spring 2015, somewhere in Italy.

The conference will be about Modern Web Development, no matter which platform: .NET, Node.js, Ruby, JavaScript.

Our Manifesto

Modern web development is moving away from all the enterprisey features that used to rule the world of development in the past years, and is going toward a more light-weight and simple approach.

  • Code Craftsmanship: Developers are taking back the control, of the code they write, on how they write and on which tools make them productive.
  • Tiny assemblable frameworks: Gone are the huge monolithic frameworks from one vendor: Modern Web Apps are a mix and match of different frameworks, technologies and languages.
  • BYOT: Bring Your Own Tool: Modern Web Development is about productivity the way you want it, not the way the vendor wants it to be.
  • Mobile First: Web sites are now mostly viewed on mobile devices: web sites and apps must be built with that in mind.

Call for presenters

To make an awesome conference we need awesome speakers, and today we are also launching the call for presenters: if you want to propose a talk that matches the ideas of our Manifest, you can already submit your proposal. Go on our Github account, fork the c4p repository, add your proposal and submit a pull request.

Call for sponsors

And we also need awesome partners and sponsors: if your company embraces our manifesto, and want to be part of this conference, please contact us via the contact form available on our website.

Subscribe to get more info

We don’t have much more to share at the moment apart from the timeframe, Spring 2015, possibly April, and the location, possibly Milano. But if you want to be the first to know about the conference, and to have the possibility to pre-register before the official registration opens, go to our website

http://webnextconf.eu/

and subscribe to the mailing list.