Why You Should Always Seal Your Classes

C# Tip: Why You Should Always Seal Your Classes Here’s a CSharp, tip I often share: Seal your classes by default. In C#, classes are inheritable unless explicitly marked as sealed. When a class is sealed, it means no other class can inherit from it. This is a simple but effective way to control your class design. I personally recommend sealing all classes unless you specifically need inheritance. Sealing your classes offers two main benefits: 1. Better Control: Sealing prevents any accidental or unwanted inheritance, making your code more predictable. 2. Improved Performance: When a class is sealed, the Just-In-Time (JIT) compiler can optimize your code better since it knows the class will never be extended. Example:

public sealed class MyClass
{
    public void DisplayMessage()
    {
        Console.WriteLine("Hello, world!");
    }
}

In this example, MyClass is sealed, so it can't be inherited by any other class. By sealing your classes, you ensure better design and slight performance improvements. So, unless inheritance is necessary, always seal your classes. What do you think? Let me know in the comments below! 👇 If this tip was helpful, follow me for more daily C# insights!