负载子实体

Question

我有这些POCO类：

public class Task 
    { 
     public int TaskId { get; set; } 
     public int ProjectId { get; set; } 
     public string Name { get; set; } 
     public string Description { get; set; } 
     public DateTime StartDate { get; set; } 
     public DateTime? DueDate { get; set; } 
     public int UserId { get; set; } 
     public string Tags { get; set; } 
     public string FileName { get; set; } 
     public virtual Project Project { get; set; } 
     public virtual List<TaskAssigned> TaskAssigns { get; set; } 
     public virtual List<TaskComment> TaskComments { get; set; } 
     public virtual User User { get; set; } 
    } 

public class User 
    { 
     public int UserId { get; set; } 
     public string Name { get; set; } 
     public int AccountId { get; set; } 
     public string Email { get; set; } 
     public string Password { get; set; } 
     public bool IsAdmin { get; set; } 
     public virtual Account Account { get; set; } 
    } 

public class TaskComment 
    { 
     public int TaskCommentId { get; set; } 
     public int TaskId { get; set; } 
     public int UserId { get; set; } 
     public string Comment { get; set; } 
     public string FileName { get; set; } 
     public virtual User User { get; set; } 
    } 

    public class TaskAssigned 
    { 
     public int TaskAssignedId { get; set; } 
     public int TaskId { get; set; } 
     public int UserId { get; set; } 
     public virtual User User { get; set; } 
    } 

我试图通过ID来获得任务，并加载了TaskComment和TaskAssigned这个任务，但用户实体的所有相关实体为空其他用户比用户在任务实体：

public Task GetTaskById(int taskId) 
    { 
     return context.Tasks.Include("TaskAssigns").Include("TaskComments").Include("User").Where(t => t.TaskId == taskId).FirstOrDefault(); 
    } 

Answer 1

在Include“路径”是包罗万象的，这意味着你可以指定一个.（点）分隔的多个属性和EF将包括“属性的所有部分路径”。

在你的情况下这应该工作：

public Task GetTaskById(int taskId) 
{ 
    return context.Tasks 
       .Include("TaskAssigns.User") 
       .Include("TaskComments.User") 
       .Include("User").Where(t => t.TaskId == taskId).FirstOrDefault(); 
} 

Answer 2

变化上下文属性如下

context.DataContext.ContextOptions.ProxyCreationEnabled = true; 
context.DataContext.ContextOptions.LazyLoadingEnabled = true;