System.Object Class

Supports all classes in the .NET Framework class hierarchy and provides low-level services to derived classes. This is the ultimate base class of all classes in the .NET Framework; it is the root of the type hierarchy.

See Also: Object Members


public class Object


Languages typically do not require a class to declare inheritance from object because the inheritance is implicit.

Because all classes in the .NET Framework are derived from object, every method defined in the object class is available in all objects in the system. Derived classes can and do override some of these methods, including:

Performance Considerations

If you are designing a class, such as a collection, that must handle any type of object, you can create class members that accept instances of the object class. However, the process of boxing and unboxing a type carries a performance cost. If you know your new class will frequently handle certain value types you can use one of two tactics to minimize the cost of boxing.

Although it is sometimes necessary to develop general purpose classes that accept and return object types, you can improve performance by also providing a type-specific class to handle a frequently used type. For example, providing a class that is specific to setting and getting Boolean values eliminates the cost of boxing and unboxing Boolean values.

Thread Safety

All public static members of this type are safe for multithreaded operations. No instance members are guaranteed to be thread safe.


Namespace: System
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0,,