How many types of c# delegates are there?

C# There are two types of delegates: unicast delegates point to a single method, and multicast delegates point to multiple methods. The unicast delegate only calls registered methods, and the multicast delegate calls all methods in the order of registration. The choice of delegation type depends on the scenario requirements: use unicast delegation when only one method is used; use multicast delegation when multiple methods need to be called.

C# Types of Delegates

In C#, there are two main types of delegates:

1. Unicast delegate

• Unicast delegate points to a single method.
• Only one method can be registered for the unicast delegate.
• When calling the delegate, only the registered methods are called.

2. Multicast delegate

• Multicast delegate points to multiple methods.
• Multiple methods can be registered on the same delegate.
• When the delegate is called, all registered methods are called (in the order of registration).

The difference between unicast delegation and multicast delegation

In addition to the number of pointed methods, unicast delegation and multicast delegation also have different behaviors. Difference:

• Asynchronous calls: Multicast delegates support asynchronous calls, while unicast delegates do not.
• Removing a delegate: Removing a delegate method from a multicast delegate is more complicated than removing a method from a unicast delegate.

Select the delegation type

Selecting unicast delegation or multicast delegation depends on the needs of the specific scenario:

• If only To use a method, use a unicast delegate.
• If you need to call multiple methods (such as event handlers), use multicast delegation.

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