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DotVVM .NET Summer Hackfest

Welcome to .NET Summer Hackfest with DotVVM, and thanks for participating.

DotVVM is an ASP.NET framework that lets you build line-of-business applications easily. DotVVM brings full MVVM experience and it uses KnockoutJS on the client side. It handles the client-server communication, validation, localization, date & time formatting on the client side, SPAs and much more. You can find more info about the project at or on GitHub.

Goals for the Session

The main goal of the session is to hide from the hot sun, learn something new and have some fun in front of your screen. Like in any open source project, there is a ton of things to do in DotVVM, from coding smaller features, addressing flaws to engineering new complex areas of functionality. Whether you like designing compilers, tweaking runtime performance, metaprogramming user interface or messing with unmanaged memory, there is something for you. :)

How to Contribute

First, start by choosing what you'd like to do - you can have a look at issues up-for-grabs label. We have also prepared other possibilities for you to have a look at listed below. Then fork the repo, clone it locally and your are ready to develop. Finally, create a pull request to the master branch, make sure that you have merged the latest changes and that the PR has a readable diff (please avoid reformatting documents, refactoring stuff, changing CRLF to LF or tabs to spaces etc.)

Which are the things I can work on?

  • up-for-grabs issues - There is sometimes a brief description how it could be implemented, but feel free to ask if anything is not clear, we will be happy to help.
  • If you'd like to implement your own feature, I'd recommend you to describe it first in an issue, so we can discuss it and help you with implementation. Sometimes the feature might be already implemented, but just have a different name.
  • We have a dotvvm-contrib repository which contains several community-created controls. We'd love to see more of them. There is a brief contributing guide in the repo.
  • Tooling - we already have quite powerful Visual Studio Extension, but there is no support for other popular editors like Visual Studio Code. Actually, there is a one-evening experiment, so you can start from it. If you'd have any questions, I'd recommend you to mention @Mylan719, the author of our Visual Studio Extension.
  • If you'd just like to try using DotVVM in an application instead of hacking its internals, feel free to publish your work on github, we will be happy to link it as a sample application. We would also appreciate any feedback from you.
  • If you like fixing things in a documentation, it is located at riganti/dotvvm-docs
  • You can also take a look at performance optimization and testing - we have a repository with benchmarks which measure time per request of all our samples. Also have a look at and at a performance report
  • DotVVM Dynamic Data - a library that generates user interface from reflection metadata and data annotation attributes. This is how you do a form for the EditedEmployee property <dd:DynamicEntity DataContext="{value: EditedEmployee}" />. You can have a look at the Roadmap in the, make it faster or try to use it and fix all the problems that you have with it ;)
  • You can always just participate in a discussion with your ideas, see issue marked as proposal. It is often actually much harder to decide how the API should look like than to do the "real coding", so you may help us a lot.

Project Setup

To get started, fork the repository, and clone it on or computer. You can use Visual Studio's Team Explorer window or run git clone<your_github_username>/dotvvm.git.

We are using Visual Studio 2017, the solution will probably not open in previous versions of Visual Studio.

Open the src/DotVVM.sln solution in Visual Studio, or open the src folder in VS Code. Set Samples/DotVVM.Samples.BasicSamples.AspNetCore as a startup project and launch it. It should just work. If it does not, feel free to ask. For VS Code try to my launch.json and tasks.json. You can also try to rebuild Tests/DotVVM.Framework.Tests.Common project and run the unit/integration tests - it should complete in few seconds, everything should be green. :)

Almost everying is in the DotVVM.Framework project, except few base interfaces and attributes in DotVVM.Core (so you don't have to reference entire dotvvm framework in a bussiess layer of the application, if you just want suppress serialization of certain fields).

The OWIN and ASP.NET Core integration is splited in two projects called DotVVM.Framework.Hosting.AspNetCore and ...Owin, so you don't have to reference Owin in your AspNetCore project and vice versa.

DotVVM.Compiler project is a command line application that can be used for view precompilation and is used by our VS Extension to dump configuration from the project after the DotvvmStartup has run.

DotVVM.CommandLine is a new project that add dotvvm subcommand to the dotnet CLI, more info in a blog post.


If you have any questions or want to ask anything, you can use a Gitter chat or post a comment in the issue you'd like to work on. We have the Czech chat at Gitter as well.

Prague event

Together with PEACHPIE Compiler Platform, we are organizing an event on 11 August in Prague. Come to this all-day event, network with the community, contribute to some open source project, and meet the authors of Czech projects DotVVM and Peachpie. You can find more information at - registarion portal in czech or at Facebook