Robert “Uncle Bob” Martin on Agile and more…

Incredibly pleased to have one of the pioneers in Agile programming: Robert “Uncle Bob” Martin.

Uncle Bob is known for, among other things, his SOLID principles of development. He is the author of the seminal book Clean Code along with Clean Coder and one of my new favorites Clean Agile.

  • 1995. Designing Object-Oriented C++ Applications Using the Booch Method. Prentice Hall. ISBN 978-0132038379.
  • 2002. Agile Software Development, Principles, Patterns, and Practices. Pearson. ISBN 978-0135974445.
  • 2009. Clean Code: A Handbook of Agile Software Craftsmanship. Prentice Hall. ISBN 978-0132350884.
  • 2011. The Clean Coder: A Code Of Conduct For Professional Programmers. Prentice Hall. ISBN 978-0137081073.
  • 2017. Clean Architecture: A Craftsman’s Guide to Software Structure and Design. Prentice Hall. ISBN 978-0134494166.
  • 2019. Clean Agile: Back to Basics. Prentice Hall. ISBN 978-0135781869.
  • 2021. Clean Craftsmanship: Disciplines, Standards, and Ethics. Addison-Wesley Professional. ISBN 978-0136915805

You can also listen to this wherever you get your Podcasts.

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Missed Patents and other sad stories

I expect most people my age have had great ideas they never patented. I’ll list a few here just to make myself feel better and to encourage you to post yours (these are ideas that are already patented or can’t be)

30 years ago when we got our puppy I put up some bells on the door and taught him that ringing the bells means we’ll take him out. He never abused the privilege. Now, doggy bells are every where.

My best invention was 25 years ago. I suggested to the people I was working with that we create a drop down button. The idea was a button with an arrow next to it. You click the arrow and a small menu appears. Whatever you pick from the menu appears as the text of the button, and clicking the button takes that action. Woe is me, it is everywhere today.

Also about 25 years ago I conceived of Quake Awake — I had read that people who awaken at the beginning of an earth quake are likelier to survive than those who sleep through: hence: Quake Awake. It would look like a smoke detector, and you could set the sensitivity, the necessary duration of quaking, the times of day (if you only want it to go off if you are sleeping) and etc. I even had a patent lawyer tell me it was a great idea. Woe is me, you could now write that as an app in about 4 hours.

Post your almost-inventions.

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James Montemagno on Maui!

I’m joined by James Montemagno, Principal Lead Program Manager for .NET Community at Microsoft, and the most enthusiastic person I know. James is the author of the .NET Presentations – .Net Maui In A Box, among many other things.

You can also listen to this wherever you get your Podcasts.

Note: My microphone was broken but I’ve edited most of my questions to the minimum and James sounds great. And, after all, it is James who you want to hear anyway!

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.vsix with Mads Kristensen

.visx files are magic as far as I’m concerned. Mads takes us through their history and how they have become much easier to create.

 vsixcookbook.com

Yet Another Podcast is available wherever you get your podcasts.

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Visual Studio Champ

Part 1 of Being a Visual Studio Champis now on video!

This is a 3 part conference streaming from Denmark and world-wide. vschamp.com

Do not miss the next one on Add-ons with (among others) Mads Kristensen. April 27, 10am Eastern.

vschamp.com

One of my secret wish items was the ability to set the background color differently for different projects so I always know where I am. The problem was that it tells you your project in the upper right, so I didn’t want to whine about it. Well guess what, I installed VS2022 Preview today and saw this:

Happy, happy, happy.

Awww snap! It works across projects (yay) but not across solutions (boo). Maybe next time.

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What I Want in Visual Studio 2022 That Isn’t There (updated)

I love Visual Studio 2022. I spend all my work day in it. It is by far the best IDE I’ve ever worked with. Each iteration gets better, with amazing features. But I’m greedy, so here are some features I want…

  • Save and name my entire working state (e.g., windows open, breakpoints, bookmarks, etc.) Then if I have to switch to another branch I can come back, drop down a list of saved working states, select the one I just saved and get back to work.
  • Switch to make the default for C# classes public (rather than internal)
  • News Flash! Mads Kristenson’s Tweaks2022 let’s you create new files with Shift-F2 and the .cs files are born public!!
  • During debug of a Xamarin.Forms app, take some action (tbd) to find out what Xaml file you are looking at
  • Of course, a visual designer for Xamarin.Forms (Blend?) – Layout, visual states, animation

Send me more! jesseliberty@gmail.com

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Jon Galloway – Yet Another Podcast

Jon Galloway comes on Yet Another Podcast to talk about… well, a lot of stuff.

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Advanced Databinding Part 4 – Binding .

In this post we will examine one of the aspects of advanced databinding that many people find confusing. Binding . (that is, Binding dot). However, it is surprisingly easy to explain.

Binding . allows you to access the entire binding context.

This is best understood with an example

<StackLayout BindingContext="{x:Static sys:DateTime.Now}"
                 HorizontalOptions="Center"
                 VerticalOptions="Center">

            <Label Text="{Binding Year, StringFormat='The year is {0}'}" />
            <Label Text="{Binding StringFormat='The month is {0:MMMM}'}" />
            <Label Text="{Binding Day, StringFormat='The day is {0}'}" />
            <Label Text="{Binding StringFormat='The time is {0:T}'}" />
            <Label Text="{Binding ., StringFormat='The full date is {0}'}" />
            <Label Text="{Binding}" />

        </StackLayout>

Here the stacklayout sets its BindingContext to DateTime.Now. That will allow us to bind to properties of the DateTime object that has the current local time. The first few lines are straight forward, we bind to properties of the DateTime object. For example,

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C# 10 & Documentation: Bill Wagner

Bill Wagner joins us once again, this time to talk about C# 10 and the evolving Microsoft. documentation.

Check back here for links but I just couldn’t wait to publish this.

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Advanced Databinding Part 3 – Null or Missing Values

You want to bind to a collection of values and display each in turn, but it is possible that some of the objects in the list have null properties, or some properties are missing altogether.

You can handle this with value converters, but there is a better (easier to write, easier to understand when reviewing) way.

In your Xaml, if you suspect a value may be null, you can makr it TargetNullValue and give it a string to display

TargetNullValue='Age unknown'

Similarly, if the value may be missing you can provide a default value,

FallbackValue='No School Found'

In this posting we’ll show how to use both.

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Advanced Databinding: Part 0 – BASICS

In the ugly old days, if you had data that you wanted to display you would put the data into a variable and then write some code to copy that data to a control on your page. If the data changed, your code had to update the display. If you had a list of data, you had a bit of code to write to get each item in the list displayed in turn.

Xamarin.Forms provides Databinding to do all that work for you. Essentially you say “here’s my data and I want it in this UI element over here. If the data changes, update the display for me.” Even better you can say “here is a collection of objects, and here is how I want you to display properties from each one in turn and if something is added to or taken from the collection, adjust the list accordingly.

“Databinding” is well named: you bind your data to a control, and as the data changes, that change is reflected in the control.

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Advanced Databinding Part 2: Converters

En Español

There are times when you need to bind to a source but the source is not in the right format or otherwise needs to be manipulated.

For example, suppose, as we’ll show below, that you have a text entry and a button, but you only want the button enabled as long as there are one or more characters in the text entry, and of course if there is no text entered you want to disable button.

You could bind the button to a boolean property in your View Model and bind the text to another property and then on text changed you could test to see if there is text in the entry control and update the button.  Yuck.

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