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What is different between an asynchronous and synchronous event receivers?

Posted By :Sagar Pardeshi     Posted Date :December 12, 2013    Points :40   Category :SharePoint 
Asynchronous events can trap an item,document library or site when it is added,deleted or updatedeg.itemAdded,ItemUpdated,ItemDeleted.

Synchronous events can trap an item,document library or site before it is deleted,updated.
Eg.ItemAdding,ItemUpdating.

You can also find related Interview Question to What is different between an asynchronous and synchronous event receivers?  below: 

What is the difference between an asynchronous and synchronous event receivers?

  
An asynchronous event occurs after an action has taken place, and a synchronous event occurs before an action has take place. For example, an asynchronous event is ItemAdded, and its sister synchronous event is ItemAdding (More...)

What are event receivers?

  
Event receivers are classes that inherit from the SpItemEventReciever or SPListEventReciever base class (both of which derive out of the abstract base class SPEventRecieverBase), and provide the option of responding to events as they occur within SharePoint, such as adding an item or deleting an item.
(More...)

What base class do event receivers inherit from?

  
Event receivers either inherit from the SPListEventReciever base class or the SPItemEventReciever base class, both which derive from the abstract base class SPEventReceiverBase.
(More...)

What are event receivers?

  
Ans. Event receivers are classes that inherit from the SpItemEventReciever or SPListEventReciever base class (both of which derive out of the abstract base class SPEventRecieverBase), and provide the option of responding to events as they occur within SharePoint, such as adding an item or deleting an item. (More...)

What are event receivers?

  
Event receivers are classes that inherit from the SpItemEventReciever or SPListEventReciever base class (both of which derive out of the abstract base class SPEventRecieverBase), and provide the option of responding to events as they occur within SharePoint, such as adding an item or deleting an item. (More...)

What base class do event receivers inherit from?

  

Event receivers either inherit from the SPListEventReciever base class or the SPItemEventReciever base class, both which derive from the abstract base class SPEventReceiverBase.
(More...)

Remote event receivers in SharePoint 2013?

  
: Remote Event Receiver is used to handle such events when app for SharePoint running on other system from the host web. Remote Event Receiver uses web service to call code when any event is triggered.
You can use Visual Studio templates to add Remote Event Receiver as we did for event receiver in earlier version. Once remote event receiver is added, it will create new WCF service in app's remote web site that implements IRemoteEventService interface where in traditional event receiver uses SPItemEventReceiver interface.
RemoteEventService interface define methods that can be called when any event occurs by SharePoint objects.
Following methods used by Remote event receiver:
. ProcessEvent - Used to process two way events before an action occur which has SPRemoteEventResult type of output. This is Synchronous event that can handle -ing events.
. ProcessOneWayEvent - Used to process one way events after an action occurs which none has output. This is Asynchronous event that can handle -ed events.
Remote Event Receiver can only work with Auto Hosted and Provider Hosted apps not for SharePoint Hosted app.
Remoter Event Receiver is supported only at List and List Item level.
Remote Event Receiver cannot run client side JavaScript code as its uses WCF Service to callback when remote event occurs. And it requires server side code.
(More...)

the difference between a delegate and an event

  
the difference between a delegate and an event

Hi


Here is the difference between a delegate and an event.

Delegate:

public class VikramDel

{

public delegate void VikramExampleDelegate(int num1,string str1);

public VikramExampleDelegate VikramDeleageteCallback;

}

Event:

public class VikramEvent

{

public delegate void VikramExampleEvent(int num1,string str2);

public event VikramExampleEvent VikramEventCallback;

}

So syntax wise there is only one difference that we have to use the event keyword with the event.

So the question comes why do we have a keyword when the same work can be done without using it. But there is a reason for the existence of the keyword event. Lets take an example how would a client work with this class

VikramDel V = new VikramDel();

V.VikramDeleageteCallback +=new

VikramDel.VikramExampleDelegate (this.VikDelegate);

Here we are adding a new target to the invocation list of the delegate. The same code will work with the other class also without any problem

VikramEvent V = new VikramEvent();

V.VikramEventCallback + =new

VikramEvent.VikramExampleEvent(this.VikDelegate);

But consider a case where by instead of adding a new target to the invocation list of the delegate if I simply set a delegate to a new delegate (The difference is with the + sign being not there).

VikramDel V = new VikramDel();

V.VikramDeleageteCallback =new

VikramDel.VikramExampleDelegate (this.VikDelegate);

This code will work fine here but the same will not work with an event.

So what it means is that if we use the event keyword no client class can set it to null. This is very important. Multiple clients can use the same delegate. After multiple client have added a function to listen to the callback of the delegate. But now one of the client sets the delegate to null or uses the = sign to add a new call back. This means that the previous invocation list will not be used any more. Hence all the previous client will not get any of the callback even if they have registered for the call back.

Hence we can say that the even keyword adds a layer of protection on the instance of the delegate. The protection prevents any client to reset the delegate invocation list. They can only add or remove the target from the invocation list. (More...)

What's a Bubbled Event ?

  
When you have a complex control, like DataGrid, writing an event processing routine for each object (cell, button, row, etc.) is quite tedious. The controls can bubble up their eventhandlers, allowing the main DataGrid event handler to take care of its constituents (More...)

How do I detach an event handler?

  
In the same way you attach an event handler, except using the -= operator.
For example:

button1.Click -= new EventHandler (button1_Click); (More...)

What is Event Bubbling?(Asp.net)

  
Server Controls like DataGrid,DataGridView , DataList etc have other controls inside them.
Example an DataGridView can have an TextBox or an button inside it.
These Child Controls can not raize events by themselves,but they pass the event to the parent control (DataGridView), which is passed to the page as "ItemCommand" event.
This process is known as EventBubling?

====================================================================
Regards Hefin Dsouza. (More...)

Which is the first event in page life-cycle Event?

  
Page_PreInit is the First event that will be executed on the page. (More...)

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