c# - 错误 属性 'xxxx' 是对象关键信息的一部分，无法在 WCF RIA 服务中修改

Question

当我尝试更新时出现以下错误消息。

属性'ID'是对象关键信息的一部分，不能修改。

   at System.Data.Objects.EntityEntry.CompareKeyProperties(Object changed)
   at System.Data.Objects.EntityEntry.ApplyOriginalValuesInternal(IEntityWrapper wrappedOriginalEntity)
   at System.Data.Objects.EntityEntry.ApplyOriginalValues(Object originalEntity)
   at System.ServiceModel.DomainServices.EntityFramework.ObjectContextUtilities.AttachAsModifiedInternal[T](T current, T original, ObjectContext objectContext)
   at System.ServiceModel.DomainServices.EntityFramework.ObjectContextExtensions.AttachAsModified[T](ObjectSet`1 objectSet, T current, T original)
   at SchoolPortal.Web.SchoolPortalService.UpdateCld_friend_request(cld_friend_request currentcld_friend_request) in D:\J\SchoolPortal.Web\SchoolPortalService.cs:line 321
   at UpdateCld_friend_request(DomainService , Object[] )
   at System.ServiceModel.DomainServices.Server.ReflectionDomainServiceDescriptionProvider.ReflectionDomainOperationEntry.Invoke(DomainService domainService, Object[] parameters)
   at System.ServiceModel.DomainServices.Server.DomainService.InvokeDomainOperationEntry(DomainOperationEntry domainOperationEntry, Object[] parameters, ChangeSetEntry operation)
   at System.ServiceModel.DomainServices.Server.DomainService.InvokeCudOperations()
   at System.ServiceModel.DomainServices.Server.DomainService.ExecuteChangeSet()
   at System.ServiceModel.DomainServices.Server.DomainService.Submit(ChangeSet changeSet)

Answer 1

这只是一个简单的解决方案....转到您的 Web 项目中的引用并右键单击“系统”并复制本地错误...它非常有效...

感谢 Pranav Singh 对此查询的评论