# ActionLogs

ID: 1D6920F5-4C95-48E9-8FD4-7B5997296A88
ModuleName: <>c
ActionName: <InitGridHeader>b__6_9
ITCode: admin
ActionUrl: /BasicData/DeviceVariable/Search
ActionTime: 2021-12-26 14:12:06.5681303
IP: ::1
Remark:
  System.NullReferenceException: Object reference not set to an instance of an object.
     at IoTGateway.ViewModel.BasicData.DeviceVariableVMs.DeviceVariableListVM.<>c.<InitGridHeader>b__6_9(DeviceVariable_View a, Object b) in E:\workbench\iotgateway\IoTGateway.ViewModel\BasicData\DeviceVariableVMs\DeviceVariableListVM.cs:line 65
     at WalkingTec.Mvvm.Core.GridColumn`1.GetText(Object source, Boolean needFormat) in E:\workbench\iotgateway\WalkingTec.Mvvm\WalkingTec.Mvvm.Core\Grid\GridColumn.cs:line 449
     at WalkingTec.Mvvm.Core.Extensions.ListVMExtension.GetSingleDataJson[T](IBasePagedListVM`2 self, Object obj, Boolean returnColumnObject, Int32 index, Boolean enumToString) in E:\workbench\iotgateway\WalkingTec.Mvvm\WalkingTec.Mvvm.Core\Extensions\ListVMExtension.cs:line 208
     at WalkingTec.Mvvm.Core.Extensions.ListVMExtension.GetDataJson[T](IBasePagedListVM`2 self, Boolean returnColumnObject, Boolean enumToString) in E:\workbench\iotgateway\WalkingTec.Mvvm\WalkingTec.Mvvm.Core\Extensions\ListVMExtension.cs:line 45
     at WalkingTec.Mvvm.Core.Extensions.ListVMExtension.GetJson[T](IBasePagedListVM`2 self, Boolean PlainText, Boolean enumToString) in E:\workbench\iotgateway\WalkingTec.Mvvm\WalkingTec.Mvvm.Core\Extensions\ListVMExtension.cs:line 361
     at IoTGateway.Controllers.DeviceVariableController.Search(DeviceVariableSearcher searcher) in E:\workbench\iotgateway\IoTGateway\Areas\BasicData\Controllers\DeviceVariableController.cs:line 31
     at lambda_method458(Closure , Object , Object[] )
     at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.SyncObjectResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
     at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeActionMethodAsync()
     at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
     at Microsoft.AspNetCore.Mvc.Infrastruc


