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December 12, 2018 | Paul D. Sheriff

A Message Broker for XAML Applications

In any application, you want to keep the coupling between any two or more objects as loose as possible. Coupling happens when one class contains a property that is used in another class or uses another class in one of its methods. If you have this situation, then this is called strong or tight coupling. One popular design pattern to help with keeping objects loosely coupled is called the mediator design pattern. The basics of this pattern are very simple; avoid one object directly talking to another object, and instead use another class to mediate between the two. This class is called a message broker. The purpose of this blog post is show you a simple approach to using a message broker in your XAML applications.

November 28, 2018 | Paul D. Sheriff

An Architecture for WPF Applications

In this blog post, you learn to create a standard architecture for your WPF applications. You learn what common classes you need, what kind of library to put those classes into, and how each of the libraries are referenced from your main application.

November 14, 2018 | Paul D. Sheriff

Uploading Files with MVC - Part 4

So far in this blog post series on uploading files with MVC, you have learned how to style the file upload control, use a view model for data binding, and create a thumbnail from an uploaded image. In this post, you learn to store the uploaded file in a folder on your server.

October 31, 2018 | Paul D. Sheriff

Uploading Files with MVC - Part 3

In the last two blog posts in this series, you learned to style the file upload control and to use a view model to simplify data binding. In this third blog post, you build a class that allows you to take a large image and create a thumbnail image from it (See Figure 1).

October 16, 2018 | Paul D. Sheriff

Uploading Files With MVC - Part 2

In the last blog post, you learned to style the file upload control and to upload a file. You gathered information about the file and placed that information into individual variables in a controller class. In this blog post, you will create a view model class with properties to hold the file information, and a method to extract the file information and upload the file.

October 2, 2018 | Paul D. Sheriff

Security in Angular - Part 3

In my last two blogs, you created a set of Angular classes to support user authentication and authorization. You also built a .NET Core Web API project to authenticate a user against an SQL Server table. An authorization object was created with individual properties for each item you wished to secure in your application. In this blog, you are going to build an array of claims and eliminate the use of single properties for each item you wish to secure. Using an array of claims is a much more flexible approach for large applications.

September 18, 2018 | Paul D. Sheriff

Uploading Files With MVC - Part 1

Users frequently want the ability to upload files to a website. If you are using MVC and Bootstrap, you know that the normal file upload control does not look like the rest of your bootstrapped controls. In this blog post, you are going to learn how to modify the default look and feel of the file upload control to make it match the rest of the Bootstrap-styled HTML.

September 12, 2018 | Paul D. Sheriff

Becoming a Web Developer

I am constantly asked by desktop developers how to make the transition to web development. Web applications are almost as powerful and as fast as desktop applications these days. There are no installation hassles as web applications reside in just one place: on your server. The user simply navigates to their application's starting point on their browser and can immediately start working. In this blog post, I provide you with guidance on how experienced developers can get started with web programming. I am not going to go in-depth into each technology and tool. Instead, I will introduce you to terms, technologies, and tools needed for web development, and provide you with links on where you can learn more about each.

August 29, 2018 | Paul D. Sheriff

Getting Started with PouchDB - Part 6

In the last several blog posts, you worked with a very flat document structure. However, in a more real-world scenario you may have a more complicated JSON object with several nested objects. Working with those types of objects requires you to query and index data slightly differently. This blog post shows you how to create a complex document structure and query that data.

August 13, 2018 | Paul D. Sheriff

Getting Started with PouchDB - Part 5

The last four blog posts have introduced you to working with a PouchDB database. You learned to modify documents one at time, in bulk, and learned to query the data within that database. In this fifth part of our ongoing series on PouchDB, you learn to use reduce queries to provide summary data such as the sum or average cost data, minimum and maximum, and how to calculate an average of cost data.

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