調用Web服務是一種常見的功能,在Silverlight2中也是可以調用別的網站的Web服務的。由於跨域訪問存在安全漏洞,所以,默認情況下,Silverlight2不允許跨域進行服務的調用。要實現跨域調用Web服務,需要在被調用的Web服務的網站跟目錄下放置一個策略配置文件:clientaccesspolicy.xml。該文件的內容如下: <?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>
<?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>
此文件的意思是允許來自任何域的任何方法的訪問。有關Sliverlight2的安全策略,請參考“使服務跨域邊界可用”的文章,地址是:http://msdn.microsoft.com/zh-cn/library/cc197955(VS.95).aspx
下面,就做一個調用的例子。
1,建立Silverlight2應用程序的工程,注意此處的工程名字是SilverlightCrossDomainCallWebService,工程名字會影響到代碼裏面一些對象的名稱寫法
2,添加一個按鈕和一個顯示信息的文本框,內容如下:<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="調用" Width="200" Margin="10" Click="Button_Click"></Button>
<TextBox x:Name="Result" Width="360" Margin="10"></TextBox>
</StackPanel>
</Grid>
</UserControl>
<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="調用" Width="200" Margin="10" Click="Button_Click"></Button>
<TextBox x:Name="Result" Width="360" Margin="10"></TextBox>
</StackPanel>
</Grid>
</UserControl>
3,切換到代碼視圖,在工程上點右鍵,選擇“添加服務引用…”,輸入Web服務地址:http://dotnet.aspx.cc/HelloWebService.asmx,名稱空間的名字也影響代碼的寫法,此處需要注意,如圖:
4,編寫調用代碼。
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();
}
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();
}
5,輸入瀏覽器 地址進行測試即可,注意:需要使用http方式進行測試,結果如圖:
轉載出處:http://blog.csdn.net/net_lover/archive/2009/02/10/3875484.aspx