In
command pattern an object is used to represent and encapsulate (hide
information) all the information needed to call a method at a later
time.
We are not directly interact with the event receiver. Instead we use Command Objects to interact
Receiver : Has operations to be executed
Invoker : Calls command to carryout operations. Command object is passed to an invoker object which invokes the command.
Command : Declares an interface for executing operations. It has Receiver object.
ConcreteCommand : Invoke operations defined on Receiver (links Receiver and action)
Client : Creates ConcreteCommand and sets its Receiver. Holds both invoker objects and command objects. It passes command objects to the invoker
Example for C#
Usage
wikipedia 
We are not directly interact with the event receiver. Instead we use Command Objects to interact
Receiver : Has operations to be executed
Invoker : Calls command to carryout operations. Command object is passed to an invoker object which invokes the command.
Command : Declares an interface for executing operations. It has Receiver object.
ConcreteCommand : Invoke operations defined on Receiver (links Receiver and action)
Client : Creates ConcreteCommand and sets its Receiver. Holds both invoker objects and command objects. It passes command objects to the invoker
Example for C#
Usage
- GUI buttons
- Macro recording
- Multi level undo
- Progressbars
- Wizards
http://stackoverflow.com/questions/tagged/command-pattern
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