我在asp.net mvc应用程序中配置实体框架连接时出现了奇怪的问题。实体框架上下文和结构映射图
我有例如结构简单:
实体:
public class EmployeeReport
{
public int EmployeeReportId { get; set; }
public DateTime Created { get; set; }
public Decimal Hours { get; set; }
public string Comment { get; set; }
public int EmployeeId { get; set; }
public int ContractId { get; set; }
public int ServiceId { get; set; }
public virtual ReportContract Contract { get; set; }
public virtual ReportService Service { get; set; }
public virtual Employee Employee { get; set; }
}
实体映射:
public class EmployeeReportMapper : EntityTypeConfiguration<EmployeeReport>
{
public EmployeeReportMapper()
{
ToTable("intranet_employee_reports");
HasKey(x => x.EmployeeReportId);
Property(x => x.Created).HasColumnName("Created").IsRequired();
Property(x => x.Comment).HasColumnName("Comment").IsOptional();
Property(x => x.Hours).HasColumnName("Hours").IsRequired();
HasRequired(x => x.Employee).WithMany().HasForeignKey(x => x.EmployeeId);
HasRequired(x => x.Service).WithMany().HasForeignKey(x => x.ServiceId);
HasRequired(x => x.Contract).WithMany().HasForeignKey(x => x.ServiceId);
}
}
的DbContext - 接口
public interface IDbContext : IDisposable
{
IDbSet<EmployeeReport> EmployeeReports { get; }
}
的DbContext - 实现
public class IntranetDbContext : DbContext,IDbContext
{
public IDbSet<EmployeeReport> EmployeeReports { get; set; }
...
public IntranetDbContext() : base("IntranetDb")
{
Database.SetInitializer<IntranetDbContext>(null);
}
public void Commit()
{
SaveChanges();
}
public void ChangeEntityState(object entity, EntityState entityState)
{
Entry(entity).State = entityState;
}
public void ExecuteSql(string query, SqlParameterCollection parameterCollection)
{
Database.ExecuteSqlCommand(query, parameterCollection);
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
/* Register custom mapping class */
modelBuilder.Configurations.Add(new EmployeeReportMapper());
....
base.OnModelCreating(modelBuilder);
}
}
最后我的结构映射配置:
public class CoreRegistry : Registry
{
public CoreRegistry()
{
For<IDbContext>().HttpContextScoped().Use<IntranetDbContext>();
...
}
}
和Global.asax中:
protected void Application_EndRequest(object sender, EventArgs e)
{
ObjectFactory.ReleaseAndDisposeAllHttpScopedObjects();
}
好了,现在的问题,在我的应用程序使用标准的构造函数依赖注入 或致电ObjectFactory.GetInstance()。
在我的一个控制器中,我调用服务类,它可以访问dbcontext并获取一些实体。
不幸的是我得到的经典例外:
的ObjectContext的实例已设置,并且可以不再使用 为需要连接的操作。
这是奇怪的,因为服务请求期间调用,所有的数据都被迫在控制器客户端...
任何想法,我哪里错了吗?
编辑:
服务代码:
public class EmployeeService : IEmployeeService
{
/// <summary>
/// IDbContext reference
/// </summary>
private readonly IDbContext _dbContext;
public EmployeeService(IDbContext dbContext)
{
_dbContext = dbContext;
}
public List<Employee> GetSubordinateEmployees(Employee employee)
{
List<Employee> employees = new List<Employee>();
foreach (var unit in employee.OrganizationUnits.ToList()) /* throw exception*/
{
foreach (var childrenUnit in unit.ChildrenUnits)
{
employees.AddRange(childrenUnit.Employees);
}
}
return employees.Distinct().ToList();
}
控制器:
private readonly IEmployeeService _employeeService;
public EmployeeReportController(IEmployeeService employeeService)
{
_employeeService = employeeService;
}
[HttpGet]
public ActionResult SearchReports()
{
List<Employee> employees = _employeeService.GetSubordinateEmployee(IntranetSession.Current.LoggedAccount.Employee).ToList(); // Exception!
...
return View();
}
}
显示实际导致异常被抛出的代码以及实际使用ObjectContext的代码。 –
已添加控制器和服务代码 – Mennion