1、错误提示：调用时提示如下错误信息

这可能是由于试图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。您可能需要与该服务的所有者联系，以发布跨域策略文件并确保该文件允许发送 SOAP 相关的 HTTP 标头。出现此错误也可能是由于使用的是 Web 服务代理中的内部类型而没有使用 InternalsVisibleToAttribute 属性。有关详细信息，请参阅内部异常。

2、解决方法：

a、到iis网站的根目录“C:\inetpub\wwwroot”下创建”ClientAccessPolicy.xml”文件，此文件的内容如下

<?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>

clientaccesspolicy.xml is for silverlight

b、到iis网站的根目录“C:\inetpub\wwwroot”下创建”crossdomain.xml”文件，此文件的内容如下

<?xml version="1.0"?>

<!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">

<cross-domain-policy>

<allow-access-from domain="*" />

<allow-http-request-headers-from domain="*" headers="*" />

</cross-domain-policy>

crossdomain.xml is for flash and also silverlight

3、”ClientAccessPolicy.xml”与”crossdomain.xml”的区别

Silverlight supports two different mechanisms for services to opt-in to cross-domain access:
•    Place a clientaccesspolicy.xml file at the root of the domain where the service is hosted to configure the service to allow cross-domain-access.
•    Place a valid crossdomain.xml file at the root of the domain where the service is hosted. Silverlight supports a subset of the crossdomain.xml schema. This file format is supported as well by ADOBE FLASH (originally by them).