Silverlight 动态调用 WebService(转)

最新推荐文章于 2019-01-09 13:02:11 发布

原创最新推荐文章于 2019-01-09 13:02:11 发布 · 714 阅读

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本文详细介绍了如何在Silverlight应用中灵活调用远程WebService和WCF服务，通过初始化参数传递服务地址，实现代码的高灵活性。包括配置绑定、创建客户端实例、调用远程方法等关键步骤，适用于前端开发、后端开发、移动开发等多个领域的开发者。

1. 配置 IIS 绑定 IP地址

2. 在 SL 中引用 WebService

3. 在需要调用 WebService 的地方写下列代码:

WCF :

BasicHttpBinding basicBinding = new BasicHttpBinding();
CustomBinding binding = new CustomBinding(basicBinding);
BindingElement binaryElement = new BinaryMessageEncodingBindingElement();
// 删除原来 Elements 集合内的 TextMessageEncodingBindingElement
binding.Elements.Remove(binding.Elements[0]);
// 添加 BinaryMessageEncodingBindingElement
binding.Elements.Insert(0, binaryElement);
// wcf 地址
EndpointAddress endPoint = new EndpointAddress("http://172.168.1.100/DynamicInvokeWCF.Web/DynWCF.svc");
// 创建 wcf 客户端
DynWCFClient client = (DynWCFClient)Activator.CreateInstance(typeof(DynWCFClient), binding, endPoint);client.DoWorkCompleted += new EventHandler<DoWorkCompletedEventArgs>(client_DoWorkCompleted);
client.DoWorkAsync();

传统 WebService:

BasicHttpBinding basicBinding = new BasicHttpBinding();
CustomBinding binding = new CustomBinding(basicBinding);
BindingElement binaryElement = new BinaryMessageEncodingBindingElement();
EndpointAddress endPoint = new EndpointAddress("http://172.168.1.100/DynamicInvokeWCF.Web/Asmx.asmx");
AsmxSoapClient client = (AsmxSoapClient)Activator.CreateInstance(typeof(AsmxSoapClient), binding, endPoint);
client.HelloWorldCompleted += new EventHandler<HelloWorldCompletedEventArgs>(client_HelloWorldCompleted);
client.HelloWorldAsync();

SilverLight动态调用WebService的方法

在我们添加Service Reference的时候，可能不知道该服务最终会被部署到什么位置，或者该服务可能被迁移，此时我们可以使用以下手段进行Service的调用，提高代码编写的灵活性。

步骤1:修改宿主Web页面的代码,将服务地址以初始化参数方式传入.

< form id ="form1" runat ="server" style ="height:100%" >
     < div id ="silverlightControlHost" >
         < object data ="data:application/x-silverlight-2," type ="application/x-silverlight-2" width ="100%" height ="100%" >
          ...
           < param name ="InitParams" value ="serviceAddress=http://localhost/services/myservices.asmx" />
           < a href ="http://go.microsoft.com/fwlink/?LinkID=149156&v=3.0.40624.0" style ="text-decoration:none" >
                < img src ="http://go.microsoft.com/fwlink/?LinkId=108181" alt ="Get Microsoft Silverlight" style ="border-style:none" />
           </ a >
         </ object >< iframe id ="_sl_historyFrame" style ="visibility:hidden;height:0px;width:0px;border:0px" ></ iframe ></ div >
     </ form >

步骤2:添加Service引用并注册调用远程方法的事件处理

添加Service的引用不必赘述.但此处添加Service Reference的目的仅在于获得远程方法的命名空间等程序结构信息。

如果我们的Silverlight程序主页面名叫MainPage,则在MainPage.xaml.cs中添加如下代码:

public void InitializeServices( string serviceAddress)
        {
            BasicHttpBinding basicBinding = new BasicHttpBinding();
            CustomBinding binding = new CustomBinding(basicBinding);
            BindingElement binaryElement = new BinaryMessageEncodingBindingElement();

            EndpointAddress endPoint = new EndpointAddress(serviceAddress);

            MyService.MyServicesSoapClient serviceClient = (MyServicesSoapClient)Activator.CreateInstance( typeof (MyServicesSoapClient), binding, endPoint);
            serviceClient.MyRemoteMethodCompleted += new EventHandler < MyService.MyRemoteMethodCompletedEventArgs > (serviceClient_MyRemoteMethodCompleted);
            serviceClient.MyRemoteMethodAsync(); // 调用远程方法
        }

步骤3:修改App.xaml.cs,添加Application.Startup事件处理方法Application_Startup

private void Application_Startup(object sender, StartupEventArgs e)
        {
            this.RootVisual = new MainPage();
            string serviceAddress = e.InitParams["serviceAddress"].ToString();
            (this.RootVisual as MainPage).InitializeServices(serviceAddress);
        }