ASP.NET Core – How to unit test a custom InputFormatter

In this article, I’ll show how to unit test a custom InputFormatter. The main thing to test is the output of the ReadRequestBodyAsync() method. To test this, you have to pass in an InputFormatterContext object containing the request body. As an example, I’ll show how to unit test the following ReadRequestBodyAync() method: Note: This parses … Read more

C# – Deserialize a JSON array to a list

When you’re working with a JSON array, you can deserialize it to a list like this: This deserializes all of the objects in the JSON array into a List<Movie>. You can use this list object like usual. Note: All examples will use System.Collections.Generic and System.Text.Json. I’ll exclude the using statements for brevity. Example – JSON … Read more

ASP.NET Core – How to unit test your middleware class

There are three requirements for unit testing a middleware class: Here’s an example: This is a simple test that only checks the response status code. By passing in DefaultHttpContext, you have control over the request and response objects. You can set the request to whatever you need, and then verify the response. I’ll show examples … Read more

C# – How to copy an object

In this article I’ll explain how to copy an object. I’ll explain the difference between shallow and deep copying, and then show multiple ways to do both approaches for copying objects. At the end, I’ll show a performance and feature comparison to help you decide which object copying method to use. Shallow copy vs Deep … Read more