我正在尝试在编写的程序中使用企业库的Unity Block。
但是我认为我使用依赖注入是错误的。我想知道是否有人可以指出我正确的方向。
static void Main(string[] args)
{
using (IUnityContainer container = new UnityContainer())
{
InitialiseContainer(container);
DataCopierFactory dcFactory = new DataCopierFactory();
ERunOptions dataCopierType = ExtractParams(args);
IDataCopier dataCopier = dcFactory.CreateDataCopier((int)dataCopierType, container);
dataCopier.DetectChanges();
dataCopier.ParseData();
dataCopier.CopyData();
}
}
}
//use the ioc container to register the EF context type to the repository interfaces..
private static void InitialiseContainer(IUnityContainer container)
{
//add Extensions:
container.AddNewExtension<Interception>();
//Licence Schedule
container.RegisterType<IEFContext, LTE_DownFromWeb_EFContext>("DataCopier.ScheduleDataCopier.Source");
container.RegisterType<IEFContext, LTE_Licensing_EFContext>("DataCopier.ScheduleDataCopier.Destination");
container.RegisterType<IRepositorySession>("Schedule_Source",new InjectionConstructor(container.Resolve<IEFContext>("DataCopier.ScheduleDataCopier.Source")));
container.RegisterType<IRepositorySession>("Schedule_Destination",new InjectionConstructor(container.Resolve<IEFContext>("DataCopier.ScheduleDataCopier.Destination")));
}
因此，基本上，DataCopier Factory会创建一个DataCopier的实例，如下所示：
DataCopierFactory：
//return a data copier that will transfer data from any DB to any other DB
public IDataCopier CreateDataCopier(int i, IUnityContainer container)
{
switch(i)
{
case 1:
return new ScheduleDataCopier(container);
default:
throw new InvalidOperationException("Parameter " + i + " does not exist");
}
}
数据复印机如下所示：
class ScheduleDataCopier : IDataCopier
{
private List<Site> _sites;
private List<SitesAndApparatuses> _scheduleList;
private IUnityContainer _container;
public ScheduleDataCopier(IUnityContainer container)
{
_container = container;
_scheduleList = new List<SitesAndApparatuses>();
}
//check if new sites registration has arrived in tblSites on down from web db.
public bool DetectChanges()
{
using (var db = _container.Resolve<IRepositorySession>("Schedule_Source"))
{
SiteAudit lastSite = new SitesAuditRepository().GetLatest();
var sitesRepo = new SitesRepository();
var sites = sitesRepo.Where(x => x.SID > lastSite.SALatestSID);
if (sites.Count() < 1)
{
return false;
}
_sites = sites.ToList();
db.Dispose();
}
return true;
}
//parse the data into a list of object SitesAndApparatuses
public bool ParseData()
{
try
{
foreach (Site s in _sites)
{
var schedule = (SitesAndApparatuses)XmlObjectBuilder.Deserialize(typeof(SitesAndApparatuses), s.XMLFile);
schedule.acCode = s.Registration.RAcCode;
_scheduleList.Add(schedule);
}
}
catch (Exception ex)
{
throw new NotImplementedException("HANDLE THIS SHIT!", ex);
}
return true;
}
public bool CopyData()
{
try
{
using (var db = _container.Resolve<IRepositorySession>("Schedule_Destination"))
{
var licensingScheduleRepo = new LicensingScheduleRepository();
//some logic
db.Commit();
}
}
catch (Exception ex)
{
}
return true;
}
}
第二个问题，我使用我通过的统一容器在Datacopier类中解析了我的工作单元对象RepositorySession……这是错误的方法吗？为什么要在网上查找有关它的任何信息呢？
这可能是太多人无法阅读的代码。但是我希望得到答案！
提前致谢
尼尔
最佳答案
我会做类似的事情：
container.RegisterType<IEFContext, LTE_DownFromWeb_EFContext>("Source");
container.RegisterType<IEFContext, LTE_Licensing_EFContext>("Destination");
container.RegisterType<IRepositorySession>("Source",new InjectionConstructor(new ResolvedParameter<IEFContext>("Source"));
container.RegisterType<IRepositorySession>("Destination",new InjectionConstructor(new ResolvedParameter<IEFContext>("Destination")));
container.RegisterType<IDataCopier,ScheduleDataCopier>("0",new InjectionConstructor(new[] {new ResolvedParameter<IRepositorySession("Source"),new ResolvedParameter<IRepositorySesison>("Destination")}));
//Now resolve
ERunOptions dataCopierType = ExtractParams(args);
IDataCopier dataCopier = container.Resolve<IDataCopier(dataCopierType.ToString());
dataCopier.DetectChanges();
dataCopier.ParseData();
dataCopier.CopyData();
DataCopier类别
class ScheduleDataCopier : IDataCopier
{
private List<Site> _sites;
private List<SitesAndApparatuses> _scheduleList;
private IRepositorySession _source;
private (IRepositorySession _destination;
public ScheduleDataCopier(IRepositorySession source, (IRepositorySession destination)
{
_source=source;
_destination=destination;
_scheduleList = new List<SitesAndApparatuses>();
}
//check if new sites registration has arrived in tblSites on down from web db.
public bool DetectChanges()
{
SiteAudit lastSite = new SitesAuditRepository().GetLatest();
var sitesRepo = new SitesRepository();
var sites = sitesRepo.Where(x => x.SID > lastSite.SALatestSID);
if (sites.Count() < 1)
{
return false;
}
_sites = sites.ToList();
_source.DoSomething();
_source.CommitAndReleaseResources();//clean up but leave object reusable
return true;
}
//parse the data into a list of object SitesAndApparatuses
public bool ParseData()
{
try
{
foreach (Site s in _sites)
{
var schedule = (SitesAndApparatuses)XmlObjectBuilder.Deserialize(typeof(SitesAndApparatuses), s.XMLFile);
schedule.acCode = s.Registration.RAcCode;
_scheduleList.Add(schedule);
}
}
catch (Exception ex)
{
throw new NotImplementedException("HANDLE THIS SHIT!", ex);
}
return true;
}
public bool CopyData()
{
try
{
var licensingScheduleRepo = new LicensingScheduleRepository();
//some logic
_desitnation.Commit();
}
catch (Exception ex)
{
//handle exception
}
return true;
}
}
与上面所做的工作之间的两个主要区别是，我使用Injection Parameters（ResolvedParameter类）在需要时动态解析对象实例。
这使我可以让Unity为我完成整个DI过程，包括解析DataCopier。如果添加另一个Datacopier，则只需将新的DataCopier类型添加到Unity中，其名称应与相应的ERunOptions类型相匹配，并且无需更改代码就能解析新的DataCopier：
container.RegisterType<IDataCopier,RandomDataCopier>("0",new InjectionConstructor(new[] {new ResolvedParameter<IRepositorySession("RandomSource"),new ResolvedParameter<IRepositorySesison>("RandomDestination")}));
和：
ERunOptions dataCopierType = ExtractParams(args);
IDataCopier dataCopier = container.Resolve<IDataCopier(dataCopierType.ToString());
dataCopier.DetectChanges();
dataCopier.ParseData();
dataCopier.CopyData();
保持不变，但可以处理ScheduledDataCopier或RandomDataCopier
关于c# - Unity IOC和Factory模式以及存储库模式，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/13518866/