Examples of Asynchronous Method Programming

This article describes AsyncCallback, BackgroundWorker, and Asynchronous Method programming of web service through examples.

// 1. Handheld Program use AsyncCallback

// 2. Use AsyncCallback for winform Program

// 3. Use BackgroundWorker

// 4. Asynchronous Method Using web service

The following is an example.

UsingSystem;

UsingSystem. Collections. Generic;

UsingSystem. Linq;

UsingSystem. Text;

UsingSystem. Threading;

UsingSystem. ComponentModel;

UsingSystem. Windows. Forms;

UsingSystem. Xml;

UsingSystem. Xml. Linq;

 

NamespaceTestAPP

{

PublicclassEntity

{

PublicintOperatorID {get; set ;}

PublicstringOperatorName {get; set ;}

PublicstringBlock {get; set ;}

PublicstringFloor {get; set ;}

}

 

Public delegate Object Asyncdelegate ();

Public class CallBack

{

// 1. Handheld Program use AsyncCallback

Public delegate void taskstatusDel (objectStatusList );

Private void BindcboStatus (objectStatusList)

{

List <ManualTask. TaskStatus> _ taskstatus = newList <ManualTask. TaskStatus> ();

_ Taskstatus = StatusList asList <ManualTask. TaskStatus>;

 

ManualTask. TaskStatus_statusObj = newManualTask. TaskStatus ();

_ StatusObj. StatusCode = "";

_ StatusObj. StatusDesc = "";

_ Taskstatus. Insert (0, _ statusObj );

 

ComboBoxcboStatus = newComboBox ();

CboStatus. DataSource = _ taskstatus;

CboStatus. DisplayMember = "StatusDesc ";

CboStatus. ValueMember = "StatusCode ";

CboStatus. SelectedIndex =-1;

}

 

Private void CallbackHandheld (IAsyncResultar)

{

 

List <ManualTask. TaskStatus> _ taskstatus = newList <ManualTask. TaskStatus> ();

 

_ Taskstatus = _ taskService. EndGetTaskStatus (ar). ToList ();

 

This. BeginInvoke (newtaskstatusDel (BindcboStatus), _ taskstatus );

}

 

Private void BindTaskStatus (stringstatusCode)

{

ManualTask. RLDMSManualSendTaskServicetaskService = newManualTask. RLDMSManualSendTaskService ();

TaskService. BeginGetTaskStatus (statusCode, new AsyncCallback (CallbackHandheld), this );

 

}

 

// 2. Use AsyncCallback for winform Program

Object GetDriverList ()

{

ManualTask. RLDMSManualSendTaskServicetaskService = newManualTask. RLDMSManualSendTaskService ();

List <ManualTask. DriverEntity> driver = newList <ManualTask. DriverEntity> ();

 

Entity_entity = newEntity ();

_ Entity. OperatorID = 0;

_ Entity. OperatorName = "";

_ Entity. Block = "4á ";

_ Entity. Floor = "1 ¼ Ó ";

Driver = taskService. GetDriver (_ entity. OperatorID, _ entity. OperatorName, _ entity. Block, _ entity. Floor). ToList ();

Return driver;

}

Private void CallbackMethod (IAsyncResultar)

{

// Retrieve the delegate.

Asyncdelegate dlgt = (Asyncdelegate) ar. AsyncState;

// Call EndInvoke to retrieve the results.

List <ManualTask. DriverEntity> driver = newList <ManualTask. DriverEntity> ();

Driver = dlgt. EndInvoke (ar) asList <ManualTask. DriverEntity>;

MessageBox. Show ("End ");~~

}

 

Public void MainCallBack ()

{

Asyncdelegateisgt = newAsyncdelegate (GetDriverList );

AsyncCallbackacb = new AsyncCallback (CallbackMethod );

IAsyncResultar = isgt. BeginInvoke (acb, isgt );

MessageBox. Show ("Start ");~~

}

 

 

// 3. Use BackgroundWorker

PublicvoidMainMethod ()

{

BackgroundWorkerbackworker = newBackgroundWorker ();

Backworker. DoWork + = newDoWorkEventHandler (Method1 );

Backworker. RunWorkerCompleted + = newRunWorkerCompletedEventHandler (back_RunWorkerCompleted );

 

Entity_entity = newEntity ();

_ Entity. OperatorID = 0;

_ Entity. OperatorName = "";

_ Entity. Block = "4á ";

_ Entity. Floor = "1 ¼ Ó ";

 

Backworker. RunWorkerAsync (_ entity );

 

MessageBox. Show ("Start ");~~

 

}

 

Public void Method1 (objectsender, DoWorkEventArgse)

{

ManualTask. RLDMSManualSendTaskServicetaskService = newManualTask. RLDMSManualSendTaskService ();

List <ManualTask. DriverEntity> driver = newList <ManualTask. DriverEntity> ();

Entity_entity = newEntity ();

_ Entity = e. Argument asEntity;

 

Driver = taskService. GetDriver (_ entity. OperatorID, _ entity. OperatorName, _ entity. Block, _ entity. Floor). ToList ();

E. Result = driver;

}

 

~

Void back_RunWorkerCompleted (objectsender, RunWorkerCompletedEventArgs e)

{

If (e. Error! = Null)

Throwe. Error;

 

List <ManualTask. DriverEntity> driver = newList <ManualTask. DriverEntity> ();

Driver = e. Result as List <ManualTask. DriverEntity>;

MessageBox. Show ("OK ");~~

}

 

 

// 4. Asynchronous Method Using web service

Public void CallWebService ()

{

ManualTask. RLDMSManualSendTaskServicetaskService = newManualTask. RLDMSManualSendTaskService ();

 

Entity_entity = newEntity ();

_ Entity. OperatorID = 0;

_ Entity. OperatorName = "";

_ Entity. Block = "4 t ";

_ Entity. Floor = "1f ";

TaskService. GetDriverAsync (_ entity. OperatorID, _ entity. OperatorName, _ entity. Block, _ entity. Floor );

 

TaskService. GetDriverCompleted + = newTestAPP. ManualTask. GetDriverCompletedEventHandler (GetDriverCompleted );

// Driver = taskService. GetDriver (_ entity. OperatorID, _ entity. OperatorName, _ entity. Block, _ entity. Floor). ToList ();

MessageBox. Show ("Start ");~

 

}

 

// § ~~~~~¥Ó‰] ² z ~~k ~

Void GetDriverCompleted (objectsender, ManualTask. GetDriverCompletedEventArgse)

{

If (e. Error! = Null)

Throwe. Error;

 

List <ManualTask. DriverEntity> driver = newList <ManualTask. DriverEntity> ();

Driver = e. Result. ToList ();

MessageBox. Show ("Finish ");~~~ // Display the cürürü ª A ‰ U ¾ ¹ ¨ ú ~

}~

}

}