Jesse Liberty

Shawn Wildermuth

Posted on December 22, 2019 by Jesse Liberty

Shawn Wildermuth has been tinkering with computers and software since he got a Vic-20 back in the early ‘80s.

As a Microsoft MVP since 2003, he’s also involved with Microsoft as an ASP.NET Insider and ClientDev Insider. You may have taken one of his more than twenty courses on Pluralsight

He’s authored eight books and innumerable articles on software development. You can also see him at one of the local and international conferences he’s spoken at including TechEd, Oredev, SDC, NDC, VSLive, DevIntersection, MIX, Devteach, DevConnections and Dev Reach.

He is one of the Wilder Minds. You can reach him at his blog. He’s also making his first, feature-length, documentary about software developers today called “Hello World: The Film”. You can see more about it here.

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Mads on C# 8 Design

Posted on November 29, 2019 by Jesse Liberty

Microsoft’s Mads Torgersen– Lead Designer of C# — talks about creating programming languages and what’s new in C# 8. Do not miss this one!

Overview of C# 8.0: https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-8

The wonderful bridge toll tutorial on pattern matching: https://docs.microsoft.com/en-us/dotnet/csharp/tutorials/pattern-matching

Brand new blog post by Mads on adopting nullable reference types: https://devblogs.microsoft.com/dotnet/embracing-nullable-reference-types/

The “9.0 candidate” milestone on csharplang – the long list of potential features for C# 9.0. Clearly we won’t do all of them!: https://github.com/dotnet/csharplang/issues?q=is%3Aopen+is%3Aissue+milestone%3A%229.0+candidate%22

Posted in C# 8 | Tagged C# 8, YapCast | Comments Off

C# 8 Nullable Types

Posted on November 27, 2019 by Jesse Liberty

I recently released a two-part course on C# 8. The first part is for beginning programmers. The second part is for intermediate to advanced programmers.

This post is the first in a series that focuses on the new features in C# 8.

I recently had Mads Torgenson on my Podcast. Mads is the lead designer of C#. I asked him what the most important new feature of C# is, and he replied (somewhat to my surprise) Nullable Types.

Every one of us has crashed and burned on the dreaded “object reference” exception. Null Reference types are designed to avoid these by expressing which objects might be null and having the editor issue a warning if you create an instance that might be null and try to dereference it.

Let’s look at an example…

Continue reading →

Posted in Essentials | Tagged C#, C# 8, Nullable References | Comments Off

Jon Galloway!

Posted on October 24, 2019 by Jesse Liberty

Microsoft’s Jon Galloway talks about the .NET Foundation and about .NET Core. As always with him, an amazing conversation.

.Net Foundation

Posted in .NET Core | Tagged YapCast | Comments Off

C#8 De Principiante a Experto Parte 1

Posted on October 18, 2019 by Jesse Liberty

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C# 8 From Novice To Expert Part 2: Intermediate & Advanced

Posted on October 12, 2019 by Jesse Liberty

https://www.udemy.com/course/c-sharp-8-from-novice-to-expert-part-2/?referralCode=809A63CDCB8F76856AEA

I look forward to your feedback. Please, tell a friend!

On ly $39.99 with this coupon: DISCOUNTCSHARP. Expires 11/15/2019

Posted in C#, C# 8 | Tagged C#, C# 8, Xamarin | Comments Off

C# 8 From Novice to Expert – Part 1 Released to Udemy

Posted on October 1, 2019 by Jesse Liberty

Part 1 assumes no prior programming experience.

Click here

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Xamarin.Forms – UI Testing & Customer Engagement

Posted on September 30, 2019 by Jesse Liberty

Microsoft’s Sweeky Satpathy. Sweeky is a Senior Software Engineer in MOBCat the Customer Engagement Team, which is part of DevDiv product engineering team responsible for all of Microsoft’s developer focused products and services and represents the voice of the developer to the rest of Microsoft. She works closely with the Xamarin team.

Posted in Essentials, Xamarin | Tagged Xamarin, Xamarin.Forms | Comments Off

Advanced Xamarin.Forms Part 1 – The API

Posted on September 8, 2019 by Jesse Liberty

Spanish Version

In this series, we will explore a number of topics on Advanced Xamarin.Forms that have arisen in our work for clients, or at my job as Principal Mobile Developer for IFS Core.

Before we can start, however, we need to build an API that we can program against. Ideally, this API will support all CRUD operations and will reside on Azure.

Continue reading →

Posted in API, Xamarin | Tagged Xamarin, Xamarin.Forms | Comments Off

Yet Another Podcast: Xamarin.Forms Tools

Posted on August 6, 2019 by Jesse Liberty

Microsoft’s Maddy Leger. Program manager for all things Xamarin.Forms Tools, talks about Hot ReLoading and much more

Show links:

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Display A Dialog From The ViewModel

Posted on February 5, 2019 by Jesse Liberty

In a previous blog post I discussed the problem of being in your ViewModel yet having to display a dialog to the user. You can’t interact with the page from the ViewModel, but you don’t want the logic of your program in the code-behind.

In that previous article, I demonstrated solving that problem using an event. In this blog post, Rodrigo Juarez and I will demonstrate three alternatives:

Using the Messaging System
Using Events (though here we’ll show a somewhat different approach)
Using dependency/service injection

There are significant problems with the first two; the most important of which is that they are difficult or impossible to write unit tests for. The third approach, however, is clean, efficient and very testable using a Mock service.

Continue reading →