Silverlight 动态配置WebService
我们知道，在silverlight中对service(web service,wcf)添加引用后，会产生一个config文件: ServiceReferences.ClientConfig.
如下所示：
- <configuration>
- <system.serviceModel>
- <bindings>
- <basicHttpBinding>
- <binding name="BasicHttpBinding_Wcf_GetData"
- maxBufferSize="2147483647" maxReceivedMessageSize="2147483647">
- <security mode="None" />
- </binding>
- </basicHttpBinding>
- </bindings>
- <client>
- <endpoint
- address="http://localhost:1522/CH10/Wcf_GetData.svc"
- binding="basicHttpBinding"
- bindingConfiguration="BasicHttpBinding_Wcf_GetData"
- contract="WcfGetDataProxy.Wcf_GetData"
- name="BasicHttpBinding_Wcf_GetData" />
- </client>
- </system.serviceModel>
- </configuration>
可以看到，这个config中配置了service的一些信息：地址，绑定类型等。这样在实例化服务时候，默认会到此config中读取相关节点信息...
但是这样有几个缺点：
1.本地开发与发布版本时候，需要重新配置文档，并编译才可。【地址位置发生了改变】
2.不安全。client端可以在IE临时文件夹中找到silverlight本地备份,xx.xap文件，可以轻松解包，看到此config文件，并获悉service地址信息....
为了避免这些问题，我们可以利用实例化服务时，服务的几个构造函数的重载函数来实现。 也就是说我们在实例化时，明确指出service的地址等信息，而不是到默认的config中查找。 可以自定义一个class,对config中的节点进行实例化，并返回特定信息，从而可以删除config文件，起到client端安全的作用。
自定义服务类别
- public class ServiceUtil {
- /// <summary>
- /// 调用远端Web service
- /// </summary>
- /// <returns></returns>
- public static ISDApp01Xml.SDApp01XmlSoapClient GetDynamicClient() {
- //BasicHttpBinding 定义
- BasicHttpBinding binding = new BasicHttpBinding(
- Application.Current.Host.Source.Scheme.Equals("https",
- StringComparison.InvariantCultureIgnoreCase) ?
- BasicHttpSecurityMode.Transport :
- BasicHttpSecurityMode.None);
- binding.MaxReceivedMessageSize = int.MaxValue;
- binding.MaxBufferSize = int.MaxValue;
- //Endpoind 定义
- EndpointAddress client = new EndpointAddress(GetHostUrl());
- //返回web service实例：注意这里利用了服务的构造函数的重载
- return new ISDApp01Xml.SDApp01XmlSoapClient(binding,client);
- }
- /// <summary>
- /// 调用本地Web service
- /// </summary>
- /// <returns></returns>
- public static myService.myServiceSoapClient GetmyService() {
- BasicHttpBinding binding = new BasicHttpBinding(
- Application.Current.Host.Source.Scheme.Equals("https",
- StringComparison.InvariantCultureIgnoreCase) ?
- BasicHttpSecurityMode.Transport : BasicHttpSecurityMode.None);
- binding.MaxReceivedMessageSize = int.MaxValue; binding.MaxBufferSize = int.MaxValue;
- //取得web service路径
- EndpointAddress client = new EndpointAddress((
- new Uri(Application.Current.Host.Source, "../myService.asmx")));
- return new myService.myServiceSoapClient(binding, client);
- }
- public static string GetHostUrl() {
- //指定web service路径
- return "http://webtest/WebServices/myService.asmx";
- }
- }
- silverlight调用：
- public partial class Demo012 : UserControl {
- public Demo012() {
- InitializeComponent();
- setBind();
- }
- private void setBind()
- {
- myService.myServiceSoapClient client= ServiceUtil.GetDynamicClient();
- string sql = "SELECT ID,NAME FROM PDM_BASIC_INFO";
- client.ExecuteQueryAsync(sql);
- client.ExecuteQueryCompleted += (sender2, e2) => {
- if (e2.Error == null) {
- dgshow.ItemsSource = from item in e2.Result.Descendants("row") select new BasicInfo {
- ID = (int)item.Attribute("ID"), Name = (string)item.Attribute("NAME") };
- }
- };
- myService.myServiceSoapClient wc = ServiceUtil.GetmyService();
- wc.sayHelloAsync();
- wc.sayHelloCompleted += (sender1, e1) => { MessageBox.Show(e1.Result); }; } }
- public class BasicInfo {
- public int ID { set; get; }
- public string Name { set; get; }
- }
