What is Asynchronous Function?

[Khan Baba]

Hi Friend,

I need your help to know about the 'Asynchronous Functions'. Type type of unction is completely new for me. I don't have any idea about the use of 'Asynchronous Functions'. Is it inbuilt function? Please let me aware about the 'Asynchronous Functions'. Also give suitable example for 'Asynchronous Functions' and it's syntax as well. Your help would be greatly appreciated.

[Reegan]

The function call is made synchronously, in which no other instruction is executed before the function returns a value. However, some functions take a long time, especially the operations of IO, And functions of communication network. Asynchronous functions is basically return data to the caller using event handler. The callback function can be invoked at any time. It is depends over how long asynchronous function takes to complete.

[opaper]

See following information regarding the ' Asynchronous Function' :

• A asynchronous method calling on thread pool standard perform the operation, then immediately returns to the calling method.
• The arguments of the synchronous method are distributed between the two methods.
• A asynchronous method that waits until the end of the operation before returning the result.

[MindSpace]

The asynchronous function make use of two methods. The first begins Begin and requests the thread pool standard perform the operation. Once the transaction is complete, a delegate from the program is called. It then calls the method whose name starts with End to retrieve the value returned by the asynchronous method. Refer following syntax:

IAsyncResult nameOfBeginmethod ( arguments_non_ref ..., AsyncCallback callback, state of object )

type_retour nameOfEndmethod (IAsyncResult, arguments_ref )

[Praetor]

Hi friend,

I don't have sound knowledge about the 'Asynchronous Function', but you can refer following some properties of the 'Asynchronous Function':

1. Object asyncState
2. bool completedSynchronously
3. WaitHandle AsyncWaitHandle
4. bool IsCompleted

[Katty]

The arguments of the asynchronous method are distributed among methods. Firstly The parameters passed by value are passed to the method Begin. And then The output parameters (out and ref) Are passed to the method End. The method Begin has two additional arguments:An object to be transmitted delegate, A delegate type AsyncCallback called when the operation is finished (it should then call the method End corresponding)