我尝试使用this Scott Allen tutorial
实现UnitofWork模式我当前的SqlUnitOfWork是下面的
public class SqlUnitOfWork : IUnitOfWork {
public SqlUnitOfWork() {
var connectionString =
ConfigurationManager
.ConnectionStrings[ConnectionStringName]
.ConnectionString;
_context = new ObjectContext(connectionString);
_context.ContextOptions.LazyLoadingEnabled = true;
}
public IRepository<PhysicalTest> PhysicalTests
{
get {
if (_physicalTests == null)
{
_physicalTests = new SqlRepository<PhysicalTest>(_context);
}
return _physicalTests;
}
}
public IRepository<EHR> EHRs
{
get
{
if (_EHRs == null)
{
_EHRs = new SqlRepository<EHR>(_context);
}
return _EHRs;
}
}
public void Commit() {
_context.SaveChanges();
}
SqlRepository<PhysicalTest> _physicalTests = null;
SqlRepository<EHR> _EHRs = null;
readonly ObjectContext _context;
const string ConnectionStringName = "default";
}
我当前的连接字符串是以下
<add name="default" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;MultipleActiveResultSets=True; initial catalog=MyAppDB" providerName="System.Data.SqlClient" />
值得指出的是,我使用mvcscaffolding创建的控制器的控制器工作正常,但工作单元(由于某种原因需要连接字符串作为参数而不是仅仅使用MyAppDBContext()实例)不起作用。
当我尝试使用以下代码调用controllr中的操作时得到的错误:
public class PhysicalTestsController : Controller
{
private IUnitOfWork unitOfWork;
private IRepository<EHR> ehrRepository;
public PhysicalTestsController(IUnitOfWork unit)
{
unitOfWork = unit;
ehrRepository = unitOfWork.EHRs;
}
public ActionResult Index(int ehrId, int? page)
{
EHR ehr = ehrRepository.FindById(ehrId);
if (ehr.UserName != User.Identity.Name)
return View("Invalid Owner");
const int pageSize = 5;
var physicaltests = ehr.PhysicalTests.OrderByDescending(test => test.CreationDate);
List<PhysicalTestListItem> physicalTestsVM = new List<PhysicalTestListItem>();
Mapper.Map(physicaltests, physicalTestsVM);
var paginatedTests = new PaginatedList<PhysicalTestListItem>(physicalTestsVM, page ?? 0, pageSize);
return View(paginatedTests);
}
}
就是这个
答案 0 :(得分:0)
我已将我的SqlRepository更改为:
public class SqlRepository<T> : IRepository<T>
where T : class, IEntity {
internal SummumnetDB context;
internal DbSet<T> _objectSet;
public SqlRepository(SummumnetDB context)
{
this.context = context;
this._objectSet = context.Set<T>();
}
..... rest of my methods here
}
和
我的SqlUnitofWork到
public class SqlUnitOfWork : IUnitOfWork {
private SummumnetDB _context = new SummumnetDB();
public IRepository<PhysicalTest> PhysicalTests
{
get {
if (_physicalTests == null)
{
_physicalTests = new SqlRepository<PhysicalTest>(_context);
}
return _physicalTests;
}
}..... rest of code here
如果这些修改不合适或打破其中一种模式,请纠正我
答案 1 :(得分:-1)
您使用的是ObjectContext
而不是DbContext
。 ObjectContext
使用EntityConnection
及其System.Data.EntityClient
提供商。它的连接字符串有different format。