• A Jon Skeet Meetup retrospective

    This week we hosted Jon Skeet at the Adelaide .NET User Group. Jon demonstrated some of the new language features coming in C# 8, and it was probably the biggest attendance we’ve had in a really, really long time.

    Because we had so many registrations, I lined up some extra help with my two oldest kids (conveniently on school holidays). They helped set up the room, liaised with the pizza delivery guy, and helped pack up everything. I think they even found a few things familiar with Jon’s use of Fibonacci sequences in one example and similarity of programming language features (my eldest daughter has been doing some Python coding at school).

    Jon lives in the UK, and we’re in Australia, so whilst we would have loved to have Jon in person, the next best thing was to have him present remotely. We’ve had remote presentations before using Google Hangouts, but this time I opted to use Skype (and made use of the new recording feature). I don’t use Skype a lot, but we got the call up and running without too much difficulty.

    I set up a webcam in the meeting room, along with a boundary microphone (an MXL AC404 USB Conference Microphone). The intention is that the presenter can see the audience, and the boundary microphone allows people to comment and ask questions from a fair way away (eg. right at the back of the room) and still be heard. This seemed to work pretty well - people up the back were able to ask questions and Jon seemed to hear them ok. Jon’s video feed was pretty good. I think our feed back might have been a bit jumpy, but for the most part I think it was ok.

    I left it to the last minute to arrange for access to the WiFi network at our venue. I ended up using my phone’s 4G data for the call, which worked well. It was only after we’d finished that I discovered that an email had come through just before the start of the meeting with the WiFi details. At least I’ve got them for next time.

    We also picked up a meeting sponsor this month in Simon Cook from Encode Talent Management. Being able to not charge attendees (to cover the cost of pizza) was great, and hopefully this relationship might continue in the future.

    Snapshot from Skype recording, showing Jon Skeet in top, audience in bottom

    Skype notes:

    • The recording doesn’t include the extra buttons/overlays/controls (which is good)
    • The recording will record a split-screen of web cams if they’re both active. If you just want to have one webcam in the recording then you’ll need to disable the other one. When screen sharing, then just that is recorded.
    • Taking a ‘snapshot’ follows similar rules as for recording. eg. a snapshot would include both webcams if they’re active, or just the shared screen if one is being shared.
    • If the presenting person isn’t using a headset, then to avoid echo it’s probably best to mute the microphone (and just un-mute it for questions)
    • Making the overlay controls slide out of the way was inconsistent. Sometimes moving the mouse off the screen worked, but one time it didn’t. Would be good to figure this out.
    • F11 makes Skype go full screen
    • Skype now supports NDI. This means it should be able to talk to software like OBS Studio if you wanted more control over broadcasting or recording. I don’t know if the feed it sends is just the video/shared screen or if that also includes the control overlays etc.

    Other notes:

    • Our regular room can hold a decent crowd if necessary.
    • People will eat as much pizza as there is available to eat
    • People don’t drink much water (but this might change if it was warmer weather)
    • Organise wifi access earlier!
    • Windows 10 has simple video editing via the Photos app

    The recording of Jon’s talk is up on YouTube. I won’t be giving up my day job to become a YouTube broadcaster anytime soon, but it’s nice to have a record of a great presentation.

  • Speaking at .NET Conf - Put your C#, VB and F# projects and packaging on a diet

    I’m really exited to be selected as one of the community speakers for .NET Conf

    Title slide for .NET Conf talk

    .NET Conf is a free “virtual” conference organised by Microsoft and the .NET developer community that is streamed live around the world. Being virtual, it means organising travel and accommodation is remarkably easy!

    My talk is titled “Put your C#, VB and F# projects and packaging on a diet”, drilling in to the new project system for .NET, and how you can use it even with old projects that target .NET Framework and it starts at 04:00 UTC on Friday 14th September (check local times). Go to https://www.dotnetconf.net/ to watch the live stream.

    All the demos from my talk and links to other resources can be found in the Github repo https://github.com/flcdrg/project-system-diet

  • Converting a SQL Server .bacpac to a .dacpac

    Microsoft SQL Server has two related portable file formats - the DACPAC and the BACPAC. Quoting Data-tier Applications:

    A DAC is a self-contained unit of SQL Server database deployment that enables data-tier developers and database administrators to package SQL Server objects into a portable artifact called a DAC package, also known as a DACPAC. A BACPAC is a related artifact that encapsulates the database schema as well as the data stored in the database.

    When they say related, they’re not kidding! Both of these files formats are based on the Open Packaging Conventions (a fancy way of saying it’s a .zip file with some other bits), and cracking them open you discover that a bacpac file is basically a dacpac with a few extra files and a couple of different settings. Knowing this, it should be possible to manually convert a bacpac to a dacpac.

    First, unzip the .bacpac file (using 7-zip, or rename to .zip and use Windows File Explorer’s Extract Archive).

    Now do the following actions (you could do these programmatically if this is something you need to do repeatedly):

    1. Edit model.xml
      1. Change [email protected] to 2.4
    2. Edit Origin.xml
      1. Change ContainsExportedData to false
      2. Change ModelSchemaVersion to 2.4
      3. Remove ExportStatistics
      4. Recalculate the SHA256 checksum for model.xml and update the value stored in Checksums/[email protected]=’/model.xml’
    3. Remove directories \_rels and Data

    Now re-zip up the remaining files and change the file suffix back to .dacpac

    To verify that the .dacpac is valid, try using SSMS with the Upgrade Data-tier Application wizard. Run it against any database and if you can proceed to without error to the “Review Upgrade Plan” step, you should be good to go.