Category: Tutorials

The const and readonly keywords in C# are used to declare variables that cannot be changed after they are initialized. Const variables are initialized at compile time and their value can never change: … while readonly variables can be initialized at compile time or runtime and their value can be updated but only in a constructor … Continue reading Difference between const and readonly in C#

In C# 9 Target Typed New Expressions were introduced. They allow us to infer type on the right, whereas var allows us to infer type on left. The simple example below shows how we can omit the type when using ‘new()’ so the code becomes a little cleaner. Click on the image for a larger … Continue reading Use Target Typed New Expressions to infer type on the right in C# 9 +

Do you know about the PARAMS keyword in C# ? The params keyword allows us to create methods that accept a variable number of arguments of the same type. The params parameter is always an array, can only be used once and it must be the last parameter in the list of parameters. Here’s a … Continue reading Use params keyword in C# to accept a variable number of arguments of the same type

Beginning with C# 11, we can use list patterns to match elements of a list or array. Some examples of different types of patterns we can use include … Constant and Relational Patterns Discard Patterns The Discard pattern assumes that you know the length of the sequence and match one or more elements from the sequence. Range … Continue reading C# 11 list pattern examples

In C#, when checking if strings are equal in a case insensitive way prefer string.Equals with OrdinalIgnoreCase over using ToLower() / ToUpper(). Why? Correctness Using ToUpper or ToLower can lead to incorrect results in certain cultures and languages. Not all languages follow the simple upper-to-lowercase mapping that English does. For example, in Turkish, the lowercase … Continue reading String.Equals with OrdinalIgnoreCase compared to ToLower / ToUpper for string insensitive comparisons in C#

I generally don’t like too much ‘sugar’ being added to C# but Switch Expressions from C# 8 really can improve readability a lot … Are you using switch expressions in your apps? Example below is courtesy of ChatGPT 😉 …

💡 – Did you know we can use local functions in C# to scope logic only to their containing methods? For readability it can be a big help to break up large methods into smaller well-named methods. When we use private methods for this however, they are scoped privately to the class when really they … Continue reading Use local functions in C# to encapsulate logic to a single calling method

C# Tip 💡 – Did you know we can get info about the caller of a method using C# (5+) info attributes? The example below shows the caller member name, file path and line number being outputted as we have annotated the parameters of the TraceMessage method with the CallerMemberName, CallerFilePath and CallerLineNumber attributes. These … Continue reading Get method caller info in C# using info attributes

File scoped types are new in C#11 and allow us to create types whose visibility is scoped to the source file in which it is declared. What do you think about this new C# feature?

In .NET we have plenty of ways to map objects to one another. Below is an example, courtesy of ChatGPT of using the EXPLICIT OPERATOR 👇🏻. How do you like to convert objects from one type to another? AutoMapper? Mapster? Plain left-right assignment perhaps using the Explicit Operator or Extension methods? The words are often … Continue reading C# Explicit Operator example to map from one type to another