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 underlying
  default controller factory will properly (attempt to!) resolve all controllers not registered with Spring.NET
  using 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>