MVC开发中的常见错误-04-“System.NullReferenceException”类型的异常在 BBFJ.OA.WebApp.dll 中发生，但未在用户代码中进行处理...

未将对象引用设置到对象实例,又名空指针异常,伴随程序员开发的一生.

查看详细信息得知: SetUserRoleInfo()

首先想到的是  IBLL.IRoleInfoService RoleInfoService { set; get; }应该是config文件中反射出现了问题

<?xml version="1.0" encoding="utf-8" ?>
<objects xmlns="http://www.springframework.net"><!--控制器--><object type="BBFJ.OA.WebApp.Controllers.UserInfoController, BBFJ.OA.WebApp" singleton="false" ><!--控制器的属性--><property name="UserInfoService" ref="userInfoService" /></object><object type="BBFJ.OA.WebApp.Controllers.LoginController, BBFJ.OA.WebApp" singleton="false" ><!--控制器的属性--><property name="UserInfoService" ref="userInfoService" /></object><object type="BBFJ.OA.WebApp.Controllers.RoleInfoController, BBFJ.OA.WebApp" singleton="false" ><!--控制器的属性--><property name="RoleInfoService" ref="roleInfoService" /></object><!--intentionally do NOT register the AccountController or the ValuesController with the container; demonstrates that the underlyingdefault controller factory will properly (attempt to!) resolve all controllers not registered with Spring.NETusing its default controller resolution behavoir--><!--<object type="Spring.Mvc4QuickStart.Controllers.AccountController, Spring.Mvc4QuickStart" singleton="false" />--><!--<object type="Spring.Mvc4QuickStart.Controllers.ValuesController, Spring.Mvc4QuickStart" singleton="false" />-->
</objects><?xml version="1.0" encoding="utf-8" ?>
<objects><object type="BBFJ.OA.BLL.UserInfoService, BBFJ.OA.BLL" singleton="false" name="userInfoService"></object><object type="BBFJ.OA.BLL.RoleInfoService, BBFJ.OA.BLL" singleton="false" name="roleInfoService"></object></objects>

检查过后发现毛病

 <object type="BBFJ.OA.WebApp.Controllers.UserInfoController, BBFJ.OA.WebApp" singleton="false" >
    <!--控制器的属性-->
    <property name="UserInfoService" ref="userInfoService" />
    <property name="RoleInfoService" ref="roleInfoService" />
  </object>