为了研究silverlight5的特性，下载了vs2012，测试Silverlight调用WCF，起初basicHttpBinding没问题，跨域解决了；试用net.tcp的时候还是遇到跨域的问题：

Could not connect to net.tcp://localhost:4502/Service1. The connection attempt lasted for a time span of 00:00:00.0550032. TCP error code 10013: 试图以其访问权限所禁止的方式访问套接字。. This could be due to attempting to access a service in a cross-domain way while the service is not configured for cross-domain access. You may need to contact the owner of the service to expose a sockets cross-domain policy over HTTP and host the service in the allowed sockets port range 4502-4534.

起初看到异常信息始终不得其解，后来google了N多资料也没有解决---很多谈的都是IIS Host，而我用的是Self-Host,后来逐字逐句看异消息，发现expose a sockets cross-domain policy over HTTP and host the service这句很有玄机，HTTP难道说的就是默认的80端口？尝试修改WCF的配置文件，将ICrossDomainService中的baseAddress端口设为80，加以辅助修改，测试成功！

ps:测试代码的背景

http://silverlightchina.net/html/tips/2010/1208/4010.html

注意：经测试发现ClientAccessPolicy.xml中grant-to一节写法对于不同的Binding有所区别：

basicHTTPBinding:

<?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>

net.tcpBinding

<?xml version="1.0" encoding="utf-8"?>
<access-policy>
 <cross-domain-access>
    <policy>
      <allow-from http-request-headers="*">
        <domain uri="*"/>
      </allow-from>
      <grant-to>
       <socket-resource port="4502" protocol="tcp" />
      </grant-to>
    </policy>
 </cross-domain-access> 
</access-policy>

 源代码下载