Question

我正在使用Code First方法来处理当前的应用程序。我在创建多个相关的entites时遇到错误。

[Table("Project.WorkItems")]
public class WorkItem
{
    public WorkItem()
    {
        Links = new List<WorkItemLink>();
        States = new List<WorkItemStatus>();
    }

    [Key]
    public int WorkItemId { get; set; }
    [FieldRequired, StringLength(100)]
    public string Title { get; set; }
    [FieldRequired(FieldRequiredAttribute.FieldTypes.Select), StringLength(100)]
    public string Iteration { get; set; }
    public int Priority { get; set; }
    [FieldRequired(FieldRequiredAttribute.FieldTypes.Select), StringLength(128), Display(Name = "Assigned To")]
    public string AssignedTo { get; set; }
    [FieldRequired(FieldRequiredAttribute.FieldTypes.Select)]
    public int ActivityType { get; set; }
    public string Description { get; set; }
    [DatabaseGenerated(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.Computed)]
    public DateTime AddedOnDate { get; set; }
    public int ProjectId { get; set; }
    public int Status { get; set; }
    public virtual ICollection<WorkItemLink> Links { get; set; }
    public virtual ICollection<WorkItemStatus> States { get; set; }
}

[Table("Projects.WorkItemStatus")]
public class WorkItemStatus
{
    [Key]
    public int StatusId { get; set; }
    public int WorkItemId { get; set; }
    public virtual WorkItem WorkItem { get; set; }
    public int ItemStatus { get; set; }
    public bool IsCurrentStatus { get; set; }
    [DatabaseGenerated(System.ComponentModel.DataAnnotations.Schema.DatabaseGeneratedOption.Computed)]
    public DateTime AddedOn { get; set; }
}

使用添加的功能

public async Task<EntityCreationResult<Models.WorkItem>> CreateWorkItemAsync(Models.WorkItem workitem)
{
     try
     {
         //workitem.States = new List<Models.WorkItemStatus>();
          if (workitem.Status == (int)Common.Helpers.Enumerations.WorkItemStatus.InProgress)
            {
                workitem.States.Add(new Models.WorkItemStatus { ItemStatus = (int)Common.Helpers.Enumerations.WorkItemStatus.ToDo, IsCurrentStatus = false });
                workitem.States.Add(new Models.WorkItemStatus { ItemStatus = (int)Common.Helpers.Enumerations.WorkItemStatus.InProgress, IsCurrentStatus = true });
            }
            else
            {
                workitem.States.Add(new Models.WorkItemStatus { ItemStatus = (int)Common.Helpers.Enumerations.WorkItemStatus.ToDo, IsCurrentStatus = true });
            }
         var result = await Context.WorkItemRepository.AddAsync(workitem);
         await Context.CommitChangesAsync();
         if (result.Succeeded)
             return result;
         throw new Exception("Failed To Create Work Item");
     }
     catch (Exception ex)
     {
         throw;
     }
 }



public async Task<EntityCreationResult<T>> AddAsync<T>(T entity) where T : class
{
    return await Task.Factory.StartNew<EntityCreationResult<T>>(() =>
        {
            if (entity == null) throw new ArgumentNullException("entity");

            if (Context.Entry(entity).State == EntityState.Detached)
            {
                Context.Set<T>().Attach(entity);
            }
            Context.Set<T>().Add(entity);

            return new EntityCreationResult<T>(entity);
        });
}

模型创建

private void BuildRelationShips(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<WorkItem>().HasMany<WorkItemLink>(s => s.Links)
             .WithRequired(s => s.WorkItem).HasForeignKey(s => s.WorkItemId);

            modelBuilder.Entity<WorkItem>().HasMany<WorkItemStatus>(s => s.States)
            .WithRequired(s => s.WorkItem).HasForeignKey(s => s.WorkItemId);
        }

数据库的更改已成功提交，但出现错误更新对象上下文时发生。 ObjectContext可能处于不一致的状态。内部异常消息：参考发生完整性约束违规：属性值定义参照约束之间不一致关系中的主体和依赖对象。

已成功提交对数据库的更改，但更新对象上下文时发生错误？

0 个答案: