以跨域方式访问服务而又没有正确的跨域策略，或策略不适用于 SOAP 服务 问题解决

解决方法：

　　一、在WCF项目根目录下添加clientaccesspolicy.xml文件

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 >

二、在silverlight项目中添加一个中介类ServerManager.cs

public   class  ServerManager
    {
         private   static  ServiceWcfClient servicePicture  =   new  ServiceWcfClient();

         internal   static  ServiceWcfClient GetPox()
        {
             if  (servicePicture.State  ==  System.ServiceModel.CommunicationState.Created)
            {
                servicePicture.Endpoint.Address  =   new  System.ServiceModel.EndpointAddress( " http://localhost:52207/ServiceWcf.svc " );
                 return  servicePicture;
            }
             else
            {
                 return  servicePicture;
            }
        }
    }

三、实例化实体类的时候一般是这样：ServiceWcfClient clientWcf = new ServiceWcfClient();

换成：ServiceWcfClient clientWcf = ServerManager.GetPox();