Why delegates in c sharp

NET represents delegates. In this article and code examples, we will learn how to use and implement delefates in C. It would be ideal to build a single delegate type that can point to methods returning either Employee or SelesEmployee types. I hope you are now have a good idea with the creation and usage of delegates types.

Now you are ready to know about events in C. At the point it saves, it simply executes the delegate. See if this crude example helps pseudo code.

We will also assume that the application starts with the Begin method of the FTP class. However, lastly, we can make it more useful by changing the delegate type to include a parameter. I consider delegates to be Anonymous Interfaces. In many cases you can use them whenever you need an interface with a single method, but you don't want the overhead of defining that interface.

A delegate is a simple class that is used to point to methods with a specific signature, becoming essentially a type-safe function pointer. A delegate's purpose is to facilitate a call back to another method or methods , after one has been completed, in a structured way. You can use a delegate. Creating a delegate is easy to do. Identify the class as a delegate with the "delegate" keyword. Then specify the signature of the type.

Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 11 years, 10 months ago. Active 2 years, 1 month ago. Viewed k times. Improve this question. A Delegate is an object that knows how to call a method.

No it is not. That's just message forwarding. It isn't delegation. From the tutorial: An event in C is a way for a class to provide notifications Events are declared using delegates. Me: Therefore, you need Delegates to implement a listener in C. That's it. MS has forced everyone into using Delegates for that. Take a look at this article codeproject. Show 2 more comments. Active Oldest Votes. Generic; using System. Linq; using System. Proper usage of delegates can promote reusability in your code and flexibility in your designs.

Net, as well as a speaker and author of several books and articles. He has more than 20 years of experience in IT including more than 16 years in Microsoft. Net and related technologies.

Here are the latest Insider stories. More Insider Sign Out. Sign In Register. Sign Out Sign In Register. Latest Insider. Check out the latest Insider stories here. For this purpose we create and use delegates. A delegate is a class that encapsulates a method signature. Although it can be used in any context, it often serves as the basis for the event-handling model in C and. One good way of understanding delegates is by thinking of a delegate as something that gives a name to a method signature.

Example: public delegate int DelegateMethod int x, int y ; Any method that matches the delegate's signature, which consists of the return type and parameters, can be assigned to the delegate. This makes is possible to programmatically change method calls, and also plug new code into existing classes. As long as you know the delegate's signature, you can assign your own-delegated method.

This ability to refer to a method as a parameter makes delegates ideal for defining callback methods. Delegate magic In class we create its object, which is instance, but in delegate when we create instance that is also referred as delegate means whatever you do you will get delegate. Delegate does not know or care about the class of the object that it references. Any object will do; all that matters is that the method's argument types and return type match the delegate's.

This makes delegates perfectly suited for "anonymous" invocation. What are the benefits of delegates? In simple words delegates are object oriented and type-safe and very secure as they ensure that the signature of the method being called is correct.

Delegates makes event handling simple and easy. What are types of delegates in C? There are two types of delegates, singlecast delegates, and multiplecast delegates. Singlecast delegate Singlecast delegate point to single method at a time. In this the delegate is assigned to a single method at a time. They are derived from System. Delegate class. Multicast Delegate When a delegate is wrapped with more than one method that is known as a multicast delegate.

In C , delegates are multicast, which means that they can point to more than one function at a time. MulticastDelegate class. How to define a delegates in C? There are three steps in defining and using delegates: 1. Declaration To create a delegate, you use the delegate keyword. The modifier can be one or an appropriate combination of the following keywords: new, public, private, protected, or internal.

The ReturnType can be any of the data types we have used so far. It can also be a type void or the name of a class.