C# Events, Delegates and Lambdas

 

 

The Role of Events, Delegates and Event Handlers

 

 

 

 

 

 

 

The Role of Events

 

 

 

 

 

 

 

The Role of Delegates

 

 

 

 

 

 

 

 

 

 

 

The Role of Event Handlers

 

 

 

 

 

 

 

 

Demo: Events, Delegates and Event Handlers in Action

 

Events Raiser

 

 

 

Event Handler

 

 

 

 

Delegates

 

 

 

 

 

 

Creating Delegates, Events and EventArgs

 

 

 

Creating Delegates

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Demo: Creating Customer Delegates

 

 

 

 

 

 

 

 

 

Demo:  Adding Multiple Delegates to an Invocation list

 

 

 

 

Demo:  Returning a value using a Delegates

 

 

 

 

 

 

 

Note:  In the case of Returning value in Multicast Delegates, only last value would be returned from the Delegates

 

 

Defining the Event

 

 

 

 

 

 

 

Demo:  Defining Events

 

 

 

 

Raising Events

 

 

 

 

 

Demo: Raising Events

 

 

 

 

 

 

 

Creating EventArgs

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Demo:  Creating an EventArgs Class

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Handling Events

 

 

 

Instantiating Delegates and Handling Events

 

 

 

 

 

 

 

Demo: Instantiating Delegates and Handling Events

 

 

 

 

 

 

 

Delegates Inference

 

 

 

 

 

 

 

Using Anonymous Methods

 

 

 

 

 

 

 

 

 

 

Lambdas, Action<T> and Func<T,TResult>

 

 

 

 

 

 

 

 

 

 

 

 

 

Demo:  Getting Started With Lambda

 

 

 

 

Demo:  Using Lambdas with Custom Delegates

 

 

 

 

 

Using Action<T>

 

 

 

 

 

 

 

Demo: Using Action<T>

 

 

 

 

 

Using Func<T,TResult>

 

 

Demo: Using Func<T,TResult>

 

 

 

 

 

Demo: Using Lambdas and Func<T,TResult> to Query Objects

 

 

 

 

 

 

 

 

Events and Delegates in Action

 

 

 

Communicating Between Components with Events and Delegates

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Asynchronous Delegates – Bad

 

 

 

 

 

 

 

 

 

 

Asynchronous Delegates – Good

 

 

 

 

 

 

 

 

 

Using Back ground Worker Events

 

 

 

 

 

 

 

 

 

 

The Role of Delegates with Threads

 

 

 

 

 

 

 

 

 

 

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