


Flex provides
This article uses WebService developed in C# language under the .NET platform as a remote data source to introduce in detail the data communication knowledge points between Flex and .NET's WebService; including connecting to WebService and remotely calling WebService methods , passing parameters and other related knowledge points to the WebService method. The usage of the three tags is basically the same. Here we take the
First take a look at the following code block:
1
3useProxy=" false">
4
5
6
wsdl attribute can be specified to the wsdl address of the WebService to be accessed, which defines two operation tags (
1///
2///return string
3///
4///
5[WebMethod]
6publicstringHelloWorld()
7{
8return"HelloWorld";
9}
10
11///
12///Return a simple object
13///
14///
15[WebMethod]
16publicBookGetBook()
17{
18returnnewBook
19{
20Id=1,
21Name="Romance of the Three Kingdoms",
22Author="Luo Guanzhong",
23Price=100
24};
25}
The above is the WebService method definition and passed in the Flex client (mxml) tag to access the complete process of WebService. Let’s take a look at how to call the methods defined by WebService on the Flex client:
1<script><br>23importmx.controls.Alert;<br>4importmx.rpc.events.FaultEvent;<br>5importmx.rpc.events.ResultEvent;<br>6<br>7/**<br>8* Initiate a request to WebService - call the HelloWorld method, dataService is the id of <webservice><br>9**/<br>10internalfunctiononRequest():void<br>11{ <br>12dataService.HelloWorld();<br>13}<br>14<br>15/**<br>16*Request result returned after successful processing<br>17**/<br>18internalfunctiononSuccess(evt:ResultEvent):void<br>19{<br>20Alert.show(evt.result.toString());<br>21 }<br>22<br>23<br>24/**<br>25*Handling function for request failure<br>26**/<br>27internalfunctiononFault(evt:FaultEvent):void<br>28{<br>29Alert.show("Failed to access WebService!");<br>30}<br>31]]><br> 32</webservice></script>
Through the above call, you can complete an interaction between Flex and .NET WebService. Of course, we can also pass parameters when calling WebService on the Flash/Flex client. The following WebMethod definition of WebService is as follows:
1///
2///will be passed in Convert the parameters to uppercase characters and return
3///
4///
5///
6[WebMethod]
7publicstringConvertToUpper(stringvalue)
8{
9returnvalue.ToUpper();
10}
You can access it by configuring
1
1 /* *
2*Initiate a request to WebService
3**/
4internalfunctiononRequest():void
5{
6//dataService.HelloWorld();
7dataService.ConvertToUpper("abcdefg");
8}
In addition, we can also pass
Go back to the front and take a look at the method definition of WebService. One of the methods, GetBook, returns a Book object. If it is the returned object, how do we get the value of this object on the Flex client? For details, see the following code example:
1internalfunctiononObject():void
2{
3dataService.GetBook();
4}
5
6internalfunctiononObjectSuccess(evt:ResultEvent):void
7{
8 //Get the return value directly through the event's result attribute, and then access the attribute directly to OK
9Alert.show(evt.result.Name);
10}
11
12/**
13*Handling function for request failure
14**/
15internalfunctiononFault(evt: FaultEvent):void
16{
17Alert.show("Access to WebService failed!");
18}

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C#.NET provides powerful tools for concurrent, parallel and multithreaded programming. 1) Use the Thread class to create and manage threads, 2) The Task class provides more advanced abstraction, using thread pools to improve resource utilization, 3) implement parallel computing through Parallel.ForEach, 4) async/await and Task.WhenAll are used to obtain and process data in parallel, 5) avoid deadlocks, race conditions and thread leakage, 6) use thread pools and asynchronous programming to optimize performance.


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