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Sealed Members in C#
Preventing Further Inheritance:
The sealed keyword is used to prevent further inheritance of a class or the overriding of specific members.
// Sealed base class
public sealed class FinalBase
{
// Class implementation
}
// Sealed method in a class
public class SealExample
{
public sealed void SealedMethod()
{
// Method implementation
}
}
Sealing a Class:
You can seal a class to prevent it from being used as a base class.
public sealed class FinalClass
{
// Class implementation
}
Sealing a Method:
Sealing a method prevents it from being overridden by derived classes.
public class SealedExample
{
public sealed void SealedMethod()
{
// Method implementation
}
}
public class DerivedFromSealed : SealedExample
{
// Attempting to override the sealed method will result in a compilation error
// public override void SealedMethod() { /* … */ }
}
Best Practices:
– Design base classes carefully, ensuring they provide a meaningful abstraction.
– Avoid sealing base classes unless necessary for specific use cases.
– Seal classes or members when you want to ensure stability and prevent unintended modifications by derived classes.
