Silverlight 动态调用 WebService(转)

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);

}

OK，至此，我们已经实现了在程序启动时调用一个MyRemoteMethod方法。以上代码稍加改动，我们就可以在程序的任意位置以这种方式调用远程方法了。

此方法对WCF Service的调用也有效，手段类似，实现略有不同。