值不能为空。
参数名: mapping
说明: 执行当前 Web 请求期间,出现未处理的异常。请检查堆栈跟踪信息,以了解有关该错误以及代码中导致错误的出处的详细信息。 异常详细信息: System.ArgumentNullException: 值不能为空。
参数名: mapping源错误:
行 36: #endregion
行 37:
行 38: public H_PublishTaskDataContext() :
行 39: base(global::System.Configuration.ConfigurationManager.ConnectionStrings["HuShua"].ConnectionString, mappingSource)
行 40: {
源文件: E:\工作\互刷网\6-17\HuShua\Models\H_PublishTask.designer.cs 行: 38 堆栈跟踪:
[ArgumentNullException: 值不能为空。
参数名: mapping]
System.Data.Linq.DataContext..ctor(String fileOrServerOrConnection, MappingSource mapping) +987481
HuShua.Models.H_PublishTaskDataContext..ctor() in E:\工作\互刷网\6-17\HuShua\Models\H_PublishTask.designer.cs:38
HuShua.Models.H_PublishTaskDataContext..cctor() in E:\工作\互刷网\6-17\HuShua\Models\H_PublishTaskModel.cs:234[TypeInitializationException: “HuShua.Models.H_PublishTaskDataContext”的类型初始值设定项引发异常。]
HuShua.Models.H_PublishTaskDataContext..ctor() in E:\工作\互刷网\6-17\HuShua\Models\H_PublishTask.designer.cs:42
HuShua.Controllers.HomeController..cctor() in E:\工作\互刷网\6-17\HuShua\Controllers\HomeController.cs:12[TypeInitializationException: “HuShua.Controllers.HomeController”的类型初始值设定项引发异常。][TargetInvocationException: 调用的目标发生了异常。]
System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck) +0
System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache) +86
System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache) +230
System.Activator.CreateInstance(Type type, Boolean nonPublic) +67
System.Activator.CreateInstance(Type type) +6
System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType) +522[InvalidOperationException: 尝试创建“HuShua.Controllers.HomeController”类型的控制器时出错。请确保控制器具有无参数公共构造函数。]
System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType) +659
System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName) +198
System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory) +219
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +160
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +92
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +42
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8679426
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
这是什么问题啊 每次要把model层新建一遍就好了 ,但是第二天有报这种错 大家帮帮忙 看下
参数名: mapping
说明: 执行当前 Web 请求期间,出现未处理的异常。请检查堆栈跟踪信息,以了解有关该错误以及代码中导致错误的出处的详细信息。 异常详细信息: System.ArgumentNullException: 值不能为空。
参数名: mapping源错误:
行 36: #endregion
行 37:
行 38: public H_PublishTaskDataContext() :
行 39: base(global::System.Configuration.ConfigurationManager.ConnectionStrings["HuShua"].ConnectionString, mappingSource)
行 40: {
源文件: E:\工作\互刷网\6-17\HuShua\Models\H_PublishTask.designer.cs 行: 38 堆栈跟踪:
[ArgumentNullException: 值不能为空。
参数名: mapping]
System.Data.Linq.DataContext..ctor(String fileOrServerOrConnection, MappingSource mapping) +987481
HuShua.Models.H_PublishTaskDataContext..ctor() in E:\工作\互刷网\6-17\HuShua\Models\H_PublishTask.designer.cs:38
HuShua.Models.H_PublishTaskDataContext..cctor() in E:\工作\互刷网\6-17\HuShua\Models\H_PublishTaskModel.cs:234[TypeInitializationException: “HuShua.Models.H_PublishTaskDataContext”的类型初始值设定项引发异常。]
HuShua.Models.H_PublishTaskDataContext..ctor() in E:\工作\互刷网\6-17\HuShua\Models\H_PublishTask.designer.cs:42
HuShua.Controllers.HomeController..cctor() in E:\工作\互刷网\6-17\HuShua\Controllers\HomeController.cs:12[TypeInitializationException: “HuShua.Controllers.HomeController”的类型初始值设定项引发异常。][TargetInvocationException: 调用的目标发生了异常。]
System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck) +0
System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache) +86
System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache) +230
System.Activator.CreateInstance(Type type, Boolean nonPublic) +67
System.Activator.CreateInstance(Type type) +6
System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType) +522[InvalidOperationException: 尝试创建“HuShua.Controllers.HomeController”类型的控制器时出错。请确保控制器具有无参数公共构造函数。]
System.Web.Mvc.DefaultControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType) +659
System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName) +198
System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory) +219
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +160
System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +92
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +42
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8679426
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
这是什么问题啊 每次要把model层新建一遍就好了 ,但是第二天有报这种错 大家帮帮忙 看下
http://www.cnblogs.com/QLeelulu/archive/2008/03/04/1090263.html
难道是实体为NULL但是给它的属性赋值了?