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What is event handler is it a type of delegate?
The EventHandler delegate is a predefined delegate that specifically represents an event handler method for an event that does not generate data. If your event does generate data, you must use the generic EventHandler delegate class.
Why Delegates are type-safe?
A delegate is a type-safe function pointer that can reference a method that has the same signature as that of the delegate. You can take advantage of delegates in C# to implement events and call-back methods. A multicast delegate is one that can point to one or more methods that have identical signatures.
Why are delegates used?
Delegates allow methods to be passed as parameters. Delegates can be used to define callback methods. Delegates can be chained together; for example, multiple methods can be called on a single event. Methods don’t need to match the delegate signature exactly.
When would you use delegates instead of interfaces?
When should Delegate be used in place of Interface
- If Interface defines only a single method then we should use Delegate.
- If multicast is required.
- If subscriber need to implement the interface multiple times.
Who is the client in the shopping cart?
Actor Description Client Person purchasing products online The client, also known as customer, is the person that logs onto the shopping cart online system to purchase products of his/her choice. Administrator Person responsible for the system. The administrator is the person in charge of managing and administering the system.
How to advertise products in a shopping cart?
Advertise Product This use case describes how a product is advertized by placing a announcement on the first page of the online shopping cart system. Ship Order This use case describes how the supplier sends the goods ordered to the client.
Which is an example of a shopping cart use case?
Advertise Product This use case describes how a product is advertized by placing a announcement on the first page of the online shopping cart system. Ship Order This use case describes how the supplier sends the goods ordered to the client.
Who are the actors in the shopping cart system?
ShoppingCart Analysis Analysis models for the Online Shopping Cart system Actors Persons or entities external to the system interacting with the system. Processes Main processes describing the online shopping system core business. Use Cases Use case for interacting with the shopping cart system.