.NET

Top 5 C# Libraries

As many of you know, I use the C# programming language a lot for my Software Development work. With that being said, I often  use some third party libraries in order to speed up development time and perhaps add some new features. However, the libraries I have listed here are used in every one of my C# projects. If your favorite C# Library is not listed. Please leave a link to it in the comments section so I can try it out. Let’s get started.

 

1. Json.NET

I specialize in making web and mobile applications and being able to parse and create JSON data is extremely important to me. Json.Net is a really useful tool for parsing and creating JSON data in your applications. It requires no setup, just add it to your project using Nuget and your now your ready to start working with JSON Data. I recommend that you spend some time reading the documentation so you know how to use the library effectively. Especially when dealing with nested elements in JSON Data. There is also a very active community around this framework in case you get stuck or get confused on the functionality. I cant recommend this library enough.

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iOS Development

How to Add Checkmarks to a ListView in Xamarin…

Recently, I was working on an app with Xamarin where I had a long list of colors that the user can pick from. I created a Simple ListView inside my app to display all of the colors in a table. However, this approach presented some unexpected problems such as:

 

  1.  How do I display a preview of the color next to the text label in my ListView Cell?
  2. How do I keep track of what colors are selected by the user?
  3. How to display a checkbox next to a color once it’s selected?

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Xamarin

Specializing in Xamarin Development

  • by dcadmin

If you have been reading my blog for the last couple weeks, you might have noticed that I have been using Xamarin to develop two mobile applications. When I wrote my initial impressions, I ran into multiple issues with getting the Android SDK to work and I also didn’t know how to use Xamarin Forms, and how to use the build in layouts, such as a StackLayout. Fast Forward a couple of weeks later, I got used to working with Android, working with the layout system and other features. In fact, I originally wrote a quick tutorial on how to use the ListView Control.

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Mobile App Development

How To Use a ListView in Xamarin Forms

  • by dcadmin

As many of you know, I’ve been contracted to create two mobile applications for some local small businesses. One common requirement for both of these applications is that the final product needs to be available on the iOS App Store and the Google Play Store. With this in mind, I figured I would try using Xamarin to create these apps. As I started working on these apps, I documented most of the initial thoughts via an older post on my blog. Since then most my problems have been resolved. However, I did notice it was hard to find good resources on how to build things using Xamarin Forms. I was able to find some old resources via some searches on YouTube, but I was not satisfied with the quality of the content. With this in mind. I wanted to take this opportunity to share what I have learned so far. Like my other Swift tutorials, we are going to start out small and work our way up. Let’s get started!

 

The ListView is a pretty common control in cross-platform mobile development. In Xamarin Forms, a ListView gets rendered out as a UITableView on iOS and a ListView in Android. You can create a ListView programmatically or you can use XAML. Once you have created your ListView you can access it in your code via its name property. Next, you have to assign an ItemSource to your ListView. In my case, I used a Generic List from the System.Collections.Generic Namespace. From there you populate your list with whatever data is going to be presented to the user. When your List is configured, set your List Object as the ItemSource property of your ListView. If you followed along with this post your app should compile fine and a ListView should show up on your device. If you encountered an error, check your code for errors as needed. Full code samples below. Happy Coding.

 

 

XAML:

 

C# Code

 

 

 

 

 

Blogging

Updates on Personal Projects: February 2018

  • by dcadmin

At the time of writing this post, I have been blogging about my software development career for over a month. Without a doubt, this has been an awesome career move for me. Ever since I posted my very first post I’ve gotten multiple compliments on the design of this website. These comments specifically surprised me the most, since I’m not a designer at all. However, I’m willing to work on the design of my apps until it looks good. I realize that I have not talked about iOS development lately. Don’t worry, I just finished the iOS app for Park-Lane Tobacconist. I think the app turned out quite well, and I definitely have plans to write about some new topics I learned during the process of making that app. I also plan to expand my writing in the area of mobile development to include Xamarin. I recently took on a cross-platform mobile application project, as a reason to check out the latest versions of the technology. I’m still in the early stages of this new project but my early thoughts on using cross-platform tools will be coming out in the next couple of weeks.

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Software Development Career

The Gear I Use To Get Things Done

  • by dcadmin

I have to admit, I’m short on time this week. Between going to school, working full time and side projects, I’m a very busy guy. Personally, I do not mind being so busy because I know this hard work is going to pay off in the long run. With that being said I figured it was time to write this post that I have been putting off for a while. This week I’m going to talk about all the gear I use to get things done. This list includes the hardware and software that I use in my daily workflow. Some of the items have an Amazon link in case you wanted to buy them for yourself.

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threading in iOS applications iOS Development

Threading in iOS Applications: The Basics

  • by dcadmin

If your new to mobile application development, one topic you should learn early on, is the concept of threading. Threading is a computer science term that handles the order of execution of tasks on the CPU. Threads are usually handled by the operating system. However there might be some tasks that can only be carried out on specialized threads created by the OS. To put things in context, consider the following example. Lets say I create an iOS application that uses a REST API to fetch data about upcoming concerts using location data. When you launch this application, the app freezes, takes a long time to load, and you see a white screen for more than 3 seconds. This is a common example of an app thats not optimized for the use of threads. As a result, you might  receive complaints from your users saying that the app is slow or they delete your application all together. After a while, you decide to make some changes.

 

Upon inspection of your code, you find that your REST call is causing this slow down inside the ViewDidLoad method. you have to remember that in this case your code is being executed line by line. This means when your REST call is carried out, the CPU must finish getting your data before displaying it on screen. After reading this, you may be asking why does this happen? This happens because by default your application business logic and UI are loaded on the same thread called the main thread. Quick operations like simple math and string manipulation are perfectly fine on the main thread, but time consuming tasks like REST calls are not the best option. So how do we fix this? The simplest thing we could do is move this time consuming task to what is called the Background Thread. The Background Thread is a thread designed for complex operations. In return you leave the Main Thread open for UI changes. Here is some example code on how to make this happen.

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