调用Web服务是一种常见的功能,在Silverlight2中也是可以调用别的网站的Web服务的。由于跨域访问存在安全漏洞,所以,默认情况下,Silverlight2不允许跨域进行服务的调用。要实现跨域调用Web服务,需要在被调用的Web服务的网站跟目录下放置一个策略配置文件:clientaccesspolicy.xml。该文件的内容如下:
<?xml version="1.0" encoding="utf-8" ?>
<access-policy>
<cross-domain-access>
<policy>
<allow-from http-request-headers="*">
<domain uri="*" />
</allow-from>
<grant-to>
<resource path="/" include-subpaths="true" />
</grant-to>
</policy>
</cross-domain-access>
</access-policy>
<access-policy>
<cross-domain-access>
<policy>
<allow-from http-request-headers="*">
<domain uri="*" />
</allow-from>
<grant-to>
<resource path="/" include-subpaths="true" />
</grant-to>
</policy>
</cross-domain-access>
</access-policy>
下面,就做一个调用的例子。
1,建立Silverlight2应用程序的工程,注意此处的工程名字是SilverlightCrossDomainCallWebService,工程名字会影响到代码里面一些对象的名称写法
2,添加一个按钮和一个显示信息的文本框,内容如下:
<usercontrol x:class="SilverlightCrossDomainCallWebService.Page" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" width="400" height="300">
<grid x:name="LayoutRoot" background="White">
<stackpanel x:name="ButtonPanel" horizontalalignment="Left">
<button content="调用" width="200" margin="10" click="Button_Click"></button>
<textbox x:name="Result" width="360" margin="10"></textbox>
</stackpanel>
</grid>
</usercontrol>
<grid x:name="LayoutRoot" background="White">
<stackpanel x:name="ButtonPanel" horizontalalignment="Left">
<button content="调用" width="200" margin="10" click="Button_Click"></button>
<textbox x:name="Result" width="360" margin="10"></textbox>
</stackpanel>
</grid>
</usercontrol>
4,编写调用代码。
private void Button_Click(object sender, RoutedEventArgs e)
{
MengXianhuiCallWebService.HelloWebServiceSoapClient service = new SilverlightCrossDomainCallWebService.MengXianhuiCallWebService.HelloWebServiceSoapClient();
service.HelloWorldCompleted += new EventHandler<silverlightcrossdomaincallwebservice.mengxianhuicallwebservice.helloworldcompletedeventargs>(service_HelloWorldCompleted);
service.HelloWorldAsync();
}
void service_HelloWorldCompleted(object sender, SilverlightCrossDomainCallWebService.MengXianhuiCallWebService.HelloWorldCompletedEventArgs e)
{
Result.Text = e.Result.ToString();
}
{
MengXianhuiCallWebService.HelloWebServiceSoapClient service = new SilverlightCrossDomainCallWebService.MengXianhuiCallWebService.HelloWebServiceSoapClient();
service.HelloWorldCompleted += new EventHandler<silverlightcrossdomaincallwebservice.mengxianhuicallwebservice.helloworldcompletedeventargs>(service_HelloWorldCompleted);
service.HelloWorldAsync();
}
void service_HelloWorldCompleted(object sender, SilverlightCrossDomainCallWebService.MengXianhuiCallWebService.HelloWorldCompletedEventArgs e)
{
Result.Text = e.Result.ToString();
}