Flex与.NET互操作(八)：使用FluorineFx网关实现远程访问
关于远程访问在本系列文章中陆续的写了不少示例了，本文没有准备深入的去探讨，为了巩固FluorineFx网关的学习和使用。于此，本文将使用FluorineFx网关来提供数据服务等多项功能来介绍通过FluorineFx实现远程访问的相关知识点。
FluorineFx提供的远程访问包括有很多方面的知道点,本文只介绍其中的三个知识点:访问远程对象返回对象,返回DataTable,返回DataSet对象.FluorineFx安装包里自带有相关的示例程序,要学习更多可直接参考这些示例程序.
在实现访问前我们同样来做一些准备工作，建立好远程对象，如下：
2 {
3 public class Book
4 {
5 public int Id { get; set; }
6 public string Name { get; set; }
7 public string Author { get; set; }
8 public double Price { get; set; }
9 }
10 }
下面是提供Flex访问的远程对象：
1 namespace Fluorine.ServiceLibrary
2 {
3 [RemotingService]
4 public class FluorineService
5 {
6 /// <summary>
7 /// 返回一个简单对象
8 /// </summary>
9 /// <returns></returns>
10 public Book GetBook()
11 {
12 return new Book
13 {
14 Id = 1,
15 Name = "《三国演义》",
16 Author = "罗贯中",
17 Price = 100
18 };
19 }
20
21 /// <summary>
22 /// 返回DataTable对象
23 /// </summary>
24 /// <returns></returns>
25 [DataTableType("Fluorine.ServiceLibrary.Book")]
26 public DataTable GetDataTable()
27 {
28 DataTable dt = new DataTable("Book");
29 dt.Columns.Add("Id", typeof(int));
30 dt.Columns.Add("Name", typeof(string));
31 dt.Columns.Add("Author", typeof(string));
32 dt.Columns.Add("Price", typeof(double));
33
34 DataRow dr = dt.NewRow();
35 dr["Id"] = 1;
36 dr["Name"] = "《三国演义》";
37 dr["Author"] = "罗贯中";
38 dr["Price"] = 52.30;
39 dt.Rows.Add(dr);
40
41 dr = dt.NewRow();
42 dr["Id"] = 2;
43 dr["Name"] = "《西游记》";
44 dr["Author"] = "吴承恩";
45 dr["Price"] = 39.91;
46 dt.Rows.Add(dr);
47
48 return dt;
49 }
50
51 /// <summary>
52 /// 返回DataSet对象
53 /// </summary>
54 /// <returns></returns>
55 [DataSetType("Fluorine.ServiceLibrary.Book")]
56 public DataSet GetDataSet()
57 {
58 DataSet ds = new DataSet("DS");
59 DataTable dt = ds.Tables.Add("Books");
60 dt.Columns.Add("Id", typeof(int));
61 dt.Columns.Add("Name", typeof(string));
62 dt.Columns.Add("Author", typeof(string));
63 dt.Columns.Add("Price", typeof(double));
64
65 DataRow dr = dt.NewRow();
66 dr["Id"] = 1;
67 dr["Name"] = "《三国演义》";
68 dr["Author"] = "罗贯中";
69 dr["Price"] = 52.30;
70 dt.Rows.Add(dr);
71
72 dr = dt.NewRow();
73 dr["Id"] = 2;
74 dr["Name"] = "《西游记》";
75 dr["Author"] = "吴承恩";
76 dr["Price"] = 39.91;
77 dt.Rows.Add(dr);
78
79 return ds;
80 }
81
82 }
83 }
上面代码片段中分别提供了返回一个对象，DataTable,DataSet对象的方法。这里只需要记住两个关键标识就行，它门是：DataTableType和DataSetType. 下面通过Flex的非可视化组件<mx:RemoteObject>来访问远程对象，OK，下面我们来看看具体怎么来调用。
2 source = " Fluorine.ServiceLibrary.FluorineService "
3 fault = " onFaultHandler(event) "
4 < mx:method name = " GetBook " result = " onGetBookHandler(event) " />
5 < mx:method name = " GetDataTable " result = " onGetDataTableHandler(event) " />
6 < mx:method name = " GetDataSet " result = " onGetDataSetHandler(event) " />
7 </ mx:RemoteObject >
一、返回对象示例
2 private var book:BookVO;
3
4 private function onGetBookHandler(evt:ResultEvent):void
5 {
6 book = evt.result as BookVO;
7 }
通过点击按扭调用远程方法GetBook()完成方法的调用，直接可以将返回结果绑定到界面元素上。
1
<
mx:Button label
=
"
Book
"
click
=
"
ro.GetBook()
"
/>
2 < mx:TextInput width = " 302 " text = " {boo.Name+book.Author+book.Price} " />
2 < mx:TextInput width = " 302 " text = " {boo.Name+book.Author+book.Price} " />
二、返回DataTable对象
返回DataTable和DataSet，将结果绑定到DataGrid上显示，先看看DataGrid的定义：
2 < mx:columns >
3 < mx:DataGridColumn headerText ="编号" dataField ="Id" />
4 < mx:DataGridColumn headerText ="书名" dataField ="Name" />
5 < mx:DataGridColumn headerText ="作者" dataField ="Author" />
6 < mx:DataGridColumn headerText ="价格" dataField ="Price" />
7 </ mx:columns >
8 </ mx:DataGrid >
DataGrid的数据源为定义的一个ArrayCollection对象，详细如下：
1
[Binable]
2 private var books:ArrayCollection;
2 private var books:ArrayCollection;
1
private
function onGetDataTableHandler(evt:ResultEvent):void
2 {
3 books = evt.result as ArrayCollection;
4 }
2 {
3 books = evt.result as ArrayCollection;
4 }
三、返回DataTable对象
1
private
function onGetDataSetHandler(evt:ResultEvent):void
2 {
3 books = evt.result as ArrayCollection;
4 }
2 {
3 books = evt.result as ArrayCollection;
4 }
如上便完成了通过FluorineFx网关来实现远程访问，下面是完整的Flex端代码，实现很简单这里就不作详细讲解：
2 < mx:Application xmlns:mx ="http://www.adobe.com/2006/mxml" layout ="absolute" >
3 < mx:Script >
4 <! [CDATA[
5 import mx.controls.Alert;
6 import mx.rpc.events.ResultEvent;
7 import mx.rpc.events.FaultEvent;
8 import mx.collections.ArrayCollection;
9 [Binable]
10 private var books:ArrayCollection;
11 [Binable]
12 private var book:BookVO;
13
14 private function onGetBookHandler(evt:ResultEvent):void
15 {
16 book=evt.result as BookVO;
17 }
18
19 private function onGetDataTableHandler(evt:ResultEvent):void
20 {
21 books=evt.result as ArrayCollection;
22 }
23
24 private function onGetDataSetHandler(evt:ResultEvent):void
25 {
26 books=evt.result as ArrayCollection;
27 }
28
29 private function onFaultHandler(evt:FaultEvent):void
30 {
31 Alert.show(evt.fault.faultDetail);
32 }
33 ]] >
34 </ mx:Script >
35 < mx:Panel x ="42" y ="56" width ="578" height ="226" layout ="absolute" fontSize ="12" >
36 < mx:DataGrid x ="10" y ="10" width ="543" height ="147" dataProvider ="{books}" >
37 < mx:columns >
38 < mx:DataGridColumn headerText ="编号" dataField ="Id" />
39 < mx:DataGridColumn headerText ="书名" dataField ="Name" />
40 < mx:DataGridColumn headerText ="作者" dataField ="Author" />
41 < mx:DataGridColumn headerText ="价格" dataField ="Price" />
42 </ mx:columns >
43 </ mx:DataGrid >
44 < mx:ControlBar >
45 < mx:Button label ="DataTable" click ="getDataTable()" />
46 < mx:Button label ="DataSet" click ="getDataSet()" />
47 < mx:Button label ="Book" click ="ro.GetBook()" />
48 < mx:TextInput width ="302" text ="{boo.Name+book.Author+book.Price}" />
49 </ mx:ControlBar >
50 </ mx:Panel >
51 < mx:RemoteObject id ="ro" destination ="fluorine" >
52 source="Fluorine.ServiceLibrary.FluorineService"
53 fault="onFaultHandler(event)"
54 < mx:method name ="GetBook" result ="onGetBookHandler(event)" />
55 < mx:method name ="GetDataTable" result ="onGetDataTableHandler(event)" />
56 < mx:method name ="GetDataSet" result ="onGetDataSetHandler(event)" />
57 </ mx:RemoteObject >
58 </ mx:Application >
59
BookVO 如下:
public class BookVO
{
public function BookVo():void
{}
public var Id:Number;
public var Name:String;
public var Author:String;
public var Price:Number;
}