Web项目HttpContext.Current 为空

项目中，用到了WCF Service服务，用的是Windows身份验证，正常登陆后 HttpContext.Current=null

解决方法——

　　1.在Web.config文件中添加配置项

<system.serviceModel>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>
  </system.serviceModel>

　　2.在Service类文件上添加Attribute

 [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]