江湖救急 论坛上一定有高手能解决小弟我这个sliverlight的跨域有关问题

江湖救急！！！ 论坛上一定有高手能解决我这个sliverlight的跨域问题
现在遇到一个Sliverlight跨域的问题。我在Sliverlight里访问一个windows程序为宿主的wcf服务一直
报跨域错误，弄了几天了一直没解决。相信坛子里的高手一定有人能搞定
已经修改windows程序的app.config文件。添加了crossDomain服务

XML code

<?xml version="1.0" encoding="utf-8" ?><configuration>  <appSettings>    <add key="isLog" value="true"/>    <add key="debugFile" value="c:\mydebug.txt"/>    <add key="filepath" value="c:\"/>    <add key="wcfpwserviceurl" value="http://localhost:7654/PWDB/"/>    <add key="wcfwfserviceurl" value="http://localhost:7655/WFDB/"/>    <add key="wcfrpserviceurl" value="http://localhost:7656/RPDB/"/>  </appSettings>  <connectionStrings>    <add name="myconstring"                connectionString="Data Source=IBM-QIANZHIYU\MSSQL2008R2;Initial Catalog=BPMDB;User ID=sa;Password=5595600" />    <add name="trackingConnectionString"                connectionString="Data Source=.;Initial Catalog=Tracking;Integrated Security=True"                providerName="System.Data.SqlClient" />    <add name="persistenceConnectionString"                connectionString="Data Source=.;Initial Catalog=SqlPersistenceService;Integrated Security=True"                providerName="System.Data.SqlClient" />  </connectionStrings>  <system.serviceModel>    <serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>    <behaviors>      <endpointBehaviors>        <behavior name="crossDomainService.crossDomainServiceBehavior">          <webHttp />        </behavior>      </endpointBehaviors>      <serviceBehaviors>      </serviceBehaviors>    </behaviors>    <services>      <service name="crossDomainService.crossDomainService">        <endpoint address="" behaviorConfiguration="crossDomainService.crossDomainServiceBehavior"                   binding="webHttpBinding" contract="crossDomainService.IcrossDomainService" />        <host>          <baseAddresses>            <add baseAddress="http://localhost:7654" />          </baseAddresses>        </host>      </service>    </services>  </system.serviceModel></configuration>

C# code

       BPM.Foundation.PWService.WCFService pws;        BPM.Foundation.WFService.WCFService wfs;        BPM.RepotrService.WCFService rps;        private void button_Start_Click(object sender, EventArgs e)        {            string pwserurl = MyConfig.getAppValue("wcfpwserviceurl");            pws = new BPM.Foundation.PWService.WCFService(new Uri(pwserurl));            int? v = pws.open();            if (v == null)            {                MyDebug.write("权限服务已启动");            }            else            {                MyDebug.write("权限服务启动失败");                MessageBox.Show("权限服务启动失败");                return;            }            //-            string rpserurl = MyConfig.getAppValue("wcfrpserviceurl");            rps = new BPM.RepotrService.WCFService(new Uri(rpserurl));            int? v1 = rps.open();            if (v1 == null)            {                MyDebug.write("报表服务已启动");            }            else            {                MyDebug.write("报表服务启动失败");                MessageBox.Show("报表服务启动失败");                return;            }                        //-            string wfserurl = MyConfig.getAppValue("wcfwfserviceurl");            wfs = new BPM.Foundation.WFService.WCFService(new Uri(wfserurl));            int? v2 = wfs.open();            if (v2 == null)            {                button_Start.Enabled = false;                button_stop.Enabled = true;                button_refresh.Enabled = true;                groupBox2.Enabled = true;                MyDebug.write("工作流服务已启动");                this.Text = "服务已启动";             }            else            {                MyDebug.write("工作流务启动失败");                MessageBox.Show("工作流务启动失败");            }          crossDomainService.crossDomainService crs = new crossDomainService.crossDomainService();         } 
 

XML code

<?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>
[解决办法]
哪有什么“跨域服务”概念？

如果端口不同，那么localhost之后跟着三个端口的地址，根目录下都要能够下载到授权xml文件。