Different Types of classes in C#
Abstract Class:
An Abstract Class means that, no object of this class can be instantiated, but can make derivation of this. It can serve the purpose of base class only as no object of this class can be created.
Abstract Class is denoted by the keyword abstract.
Partial Class:
This special type of class called "Partial Class" is introduced with .Net Framework 2.0. Partial Class allows its members – method, properties, and events – to be divided into multiple source files (.cs).At compile time these files get combined into a single class.
Partial Class is denoted by the keyword partial.
Some do's and don'ts about partial class:-
• All the parts of a partial class must be prefixed with the keyword partial.
• Accessibility, signature etc. must be same in all parts of the partial class.
• You cannot sealed one part of the partial class. In that case entire class in sealed.
• If you define any part of the partial class abstract, entire class will become abstract.
• Inheritance cannot be applied to a part of partial class. If you do so, it applies to entire class.
Static Class:
A Static Class is one which cannot be instantiated. The keyword new cannot be used with static classes as members of such class can be called directly by using the class name itself.
Following are the main characteristics of a static class:-
• A Static Class can only have static members.
• A Static Class cannot be instantiated.
• A Static Class is sealed, so cannot be inherited.
• A Static Class cannot have a constructor (except static constructor).
Static Class is denoted by the keyword static.
Sealed Class:
A sealed class is a class which cannot be inherited. A sealed class cannot be a base class. The modifier abstract cannot be applied to a sealed class. By default, struct (structure) is sealed. It is the last class in hierarchy. To access the members of a sealed class, you must create objects of that class.
Sealed Class is denoted by the keyword sealed.
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