关于Silverlight调用天气预报接口问题

问题：因Silverlight客户端不能直接调用webservice接口（外网天气接口），调用会出现跨域访问的问题，即使添加了跨域文件也不好使。解决方法如下

解决方法一：1.在服务端建立一个wcf服务端，在wcf里调用webservice接口（外网天气接口）

wcf服务接口IWeatherService.cs

 1 using System;

 2 using System.Collections.Generic;

 3 using System.Linq;

 4 using System.Runtime.Serialization;

 5 using System.ServiceModel;

 6 using System.Text;

 7 

 8 namespace WcfServiceWeather

 9 {

10     // 注意: 使用“重构”菜单上的“重命名”命令，可以同时更改代码和配置文件中的接口名“IWeatherService”。

11     [ServiceContract]

12     public interface IWeatherService

13     {

14         [OperationContract]

15         string[] GetCityWeather(string CityName);

16     }

17 }

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wcf服务实现类WeatherService.cs

 1 using System;

 2 using System.Collections.Generic;

 3 using System.Linq;

 4 using System.Runtime.Serialization;

 5 using System.ServiceModel;

 6 using System.Text;

 7 

 8 namespace WcfServiceWeather

 9 {

10     // 注意: 使用“重构”菜单上的“重命名”命令，可以同时更改代码、svc 和配置文件中的类名“WeatherService”。

11     // 注意: 为了启动 WCF 测试客户端以测试此服务，请在解决方案资源管理器中选择 WeatherService.svc 或 WeatherService.svc.cs，然后开始调试。

12     public class WeatherService : IWeatherService

13     {

14         public string[] GetCityWeather(string CityName)

15         {

16             ServiceRefWeather.WeatherWebServiceSoapClient client = new ServiceRefWeather.WeatherWebServiceSoapClient("WeatherWebServiceSoap");

17             string[] cityNameWeather = client.getWeatherbyCityName(CityName);

18             return cityNameWeather;

19         }

20     }

21 }

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添加完成后预览服务，将会在配置文件中自动生成相应的配置system.serviceModel

 1 <?xml version="1.0" encoding="utf-8"?>

 2 <configuration>

 3 

 4   <appSettings>

 5     <add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />

 6   </appSettings>

 7   <system.web>

 8     <compilation debug="true" targetFramework="4.5" />

 9     <httpRuntime targetFramework="4.5"/>

10   </system.web>

11   <system.serviceModel>

12     <bindings>

13       <basicHttpBinding>

14         <binding name="WeatherWebServiceSoap" />

15       </basicHttpBinding>

16       <customBinding>

17         <binding name="WeatherWebServiceSoap12">

18           <textMessageEncoding messageVersion="Soap12" />

19           <httpTransport />

20         </binding>

21       </customBinding>

22     </bindings>

23     <client>

24       <endpoint address="http://www.webxml.com.cn/WebServices/WeatherWebService.asmx"

25         binding="basicHttpBinding" bindingConfiguration="WeatherWebServiceSoap"

26         contract="ServiceRefWeather.WeatherWebServiceSoap" name="WeatherWebServiceSoap" />

27       <endpoint address="http://www.webxml.com.cn/WebServices/WeatherWebService.asmx"

28         binding="customBinding" bindingConfiguration="WeatherWebServiceSoap12"

29         contract="ServiceRefWeather.WeatherWebServiceSoap" name="WeatherWebServiceSoap12" />

30     </client>

31     <behaviors>

32       <serviceBehaviors>

33         <behavior>

34           <!-- 为避免泄漏元数据信息，请在部署前将以下值设置为 false -->

35           <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true"/>

36           <!-- 要接收故障异常详细信息以进行调试，请将以下值设置为 true。在部署前设置为 false 以避免泄漏异常信息 -->

37           <serviceDebug includeExceptionDetailInFaults="false"/>

38         </behavior>

39       </serviceBehaviors>

40     </behaviors>

41     <protocolMapping>

42         <add binding="basicHttpsBinding" scheme="https" />

43     </protocolMapping>    

44     <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />

45   </system.serviceModel>

46   <system.webServer>

47     <modules runAllManagedModulesForAllRequests="true"/>

48     <!--

49         若要在调试过程中浏览 Web 应用程序根目录，请将下面的值设置为 True。

50         在部署之前将该值设置为 False 可避免泄露 Web 应用程序文件夹信息。

51       -->

52     <directoryBrowse enabled="true"/>

53   </system.webServer>

54 

55 </configuration>

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2.Silverlight客户端添加服务引用（此处添加的是wcf的服务引用）

 1 ServiceReference1.WeatherServiceClient client = new ServiceReference1.WeatherServiceClient();

 2                 client.GetCityWeatherCompleted += (s, e) =>

 3                 {

 4                     try

 5                     {

 6                         if (e.Error == null)

 7                         {

 8                             var result=e.Result;//此处处理结果就ok了

 9                          }

10                     catch (Exception ex)

11                     {

12                         lbltitle1.Content = ex.Message;

13                     }

14 

15                 };

16                 client.GetCityWeatherAsync("北京");

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3.添加跨域文件clientaccesspolicy.xml

 1 <?xml version="1.0" encoding="utf-8" ?>    

 2 <access-policy>    

 3   <cross-domain-access>    

 4     <policy>    

 5       <allow-from http-request-headers="*">    

 6         <domain uri="*"/>    

 7       </allow-from>    

 8       <grant-to>    

 9         <resource include-subpaths="true" path="/"/>    

10       </grant-to>    

11     </policy>    

12   </cross-domain-access>    

13 </access-policy>

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crossdomain.xml

1 <?xml version="1.0" encoding="UTF-8"?>

2 <!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd" >

3 <cross-domain-policy>

4   <site-control permitted-cross-domain-policies="all" />

5   <allow-access-from domain="*" />

6   <allow-http-request-headers-from domain="*" headers="*"/>

7 </cross-domain-policy>

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解决方法二：直接在Silverlight的web中添加wcf无法文件、添加（外网天气服务接口）处理天气接口，然后在客户端直接调用自己创建的wcf，此时客户端会产生一个ServiceReferences.ClientConfig的文件

 1 <configuration>

 2     <system.serviceModel>

 3         <bindings>

 4             <basicHttpBinding>

 5                 <binding name="BasicHttpBinding_IWeatherService" maxBufferSize="2147483647"

 6                     maxReceivedMessageSize="2147483647">

 7                     <security mode="None" />

 8                 </binding>

 9             </basicHttpBinding>

10         </bindings>

11         <client>

12             <endpoint address="http://192.168.0.161:8080/bjsw/WCF/WeatherService.svc"

13                 binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_IWeatherService"

14                 contract="ServiceReference1.IWeatherService" name="BasicHttpBinding_IWeatherService" />

15         </client>

16     </system.serviceModel>

17 </configuration>

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在客户端直接调用就ok了