Make a Class Immutable in C#

 

• sealed Keyword: Applying the sealed keyword to the class prevents it from being inherited. This is important for true immutability because a derived class could potentially introduce mutable behavior.
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• readonly Fields: Declare all instance fields as readonly. This ensures that the field can only be assigned a value in the constructor of the class or during its declaration. Once assigned, its value cannot be changed.
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• Do Not Provide Setters
  • Properties should be get-only, meaning there are no set accessors.
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