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Modern C# and .NET Tutorial: Cross-Platform Basics

Implementing Functions with Operators and Local Functions

Explore how to implement custom operators like + and * to simplify object interactions and create local functions for encapsulated logic within methods. This lesson helps you understand operator overloading and local functions in C#, enhancing your ability to build expressive and maintainable code often used in object-oriented design.

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Let’s explore C# operators, starting with string concatenation using the Concat method and transitioning to intuitive operators like + and * . We then leverage operators to enhance code simplicity and expressiveness through operator overloading and local functions.

Implementing functionality using operators

The System.String class has a static method named Concat that concatenates two string values and returns the result, as shown in the following code:

C#
string s1 = "Hello ";
string s2 = "World!";
string s3 = string.Concat(s1, s2);
WriteLine(s3); // Hello World!

Calling a method like Concat works, but it might be more natural for a programmer to use the + symbol operator to “add” two string values together, as shown in the following code:

C#
string s3 = s1 + s2;

A well-known biblical phrase is ‘Go forth and multiply’, meaning to procreate. Let’s write code so that the * (multiply) symbol will allow two ...