MVC開發中的常見錯誤-04-“System.NullReferenceException”類型的異常在 BBFJ.OA.WebApp.dll 中發生，但未在用戶代碼中進行處理...

未將對象引用設置到對象實例,又名空指針異常,伴隨程序員開發的一生.

查看詳細信息得知:?SetUserRoleInfo()

首先想到的是? IBLL.IRoleInfoService RoleInfoService { set; get; }應該是config文件中反射出現了問題

<?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" ><!--控制器的屬性--><property name="UserInfoService" ref="userInfoService" /></object><object type="BBFJ.OA.WebApp.Controllers.LoginController, BBFJ.OA.WebApp" singleton="false" ><!--控制器的屬性--><property name="UserInfoService" ref="userInfoService" /></object><object type="BBFJ.OA.WebApp.Controllers.RoleInfoController, BBFJ.OA.WebApp" singleton="false" ><!--控制器的屬性--><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>

檢查過后發現毛病

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

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