我已经注册了一些代码：
var stringHelperService = new StringHelperService(new AssemblyService(Assembly.GetExecutingAssembly()));
var personalSetting = new PersonalSetting(stringHelperService, new PersonalSettingRepository(new XmlRepository(stringHelperService.PersonalSettingFile)));
var builder = new ContainerBuilder();
builder.RegisterType<Login>().AsSelf();
builder.RegisterType<AssemblyService>()
.As<IAssemblyService>()
.WithParameter("assembly", Assembly.GetExecutingAssembly());
builder.RegisterType<XmlRepository>()
.As<IXmlRepository>()
.WithParameter("xmlFile", stringHelperService.PersonalSettingFile);
builder.RegisterType<StringHelperService>().As<IStringHelperService>(); ;
builder.RegisterType<PersonalSettingRepository>().As<IPersonalSettingRepository>();
builder.RegisterType<PersonalSetting>().As<IPersonalSettingService>();
builder.RegisterType<CompanyRepository>().As<ICompanyRepository>();
builder.RegisterType<CompanyService>().As<ICompanyService>();
builder.RegisterType<SqlHelperService>().As<ISqlHelperService>();
var setting = personalSetting.Get();
var connString = "None";
if (!string.IsNullOrEmpty(setting.ConnectionString))
connString = setting.ConnectionString;
builder.RegisterGeneric(typeof(GenericSQLRepository<>))
.As(typeof(IGenericSQLRepository<>))
.WithParameter("context", new MyStoreDataContext(connString))
.InstancePerLifetimeScope();
return builder.Build();
我将connectionstring加密保存在单独的xml文件中，并在用户注册时将其注入。但是我收到了一个错误：
> Autofac.Core.DependencyResolutionException occurred
HResult=0x80131500
Message=An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = Login (ReflectionActivator), Services = [MyStore_Intranet.Windows.Login], Lifetime = Autofac.Core.Lifetime.CurrentScopeLifetime, Sharing = None, Ownership = OwnedByLifetimeScope
Source=<Cannot evaluate the exception source>
StackTrace:
at Autofac.Core.Resolving.InstanceLookup.Activate(IEnumerable`1 parameters)
at Autofac.Core.Resolving.InstanceLookup.Execute()
at Autofac.Core.Resolving.ResolveOperation.GetOrCreateInstance(ISharingLifetimeScope currentOperationScope, IComponentRegistration registration, IEnumerable`1 parameters)
at Autofac.Core.Resolving.ResolveOperation.Execute(IComponentRegistration registration, IEnumerable`1 parameters)
at Autofac.Core.Lifetime.LifetimeScope.ResolveComponent(IComponentRegistration registration, IEnumerable`1 parameters)
at Autofac.Core.Container.ResolveComponent(IComponentRegistration registration, IEnumerable`1 parameters)
at Autofac.ResolutionExtensions.TryResolveService(IComponentContext context, Service service, IEnumerable`1 parameters, Object& instance)
at Autofac.ResolutionExtensions.ResolveService(IComponentContext context, Service service, IEnumerable`1 parameters)
at Autofac.ResolutionExtensions.Resolve[TService](IComponentContext context, IEnumerable`1 parameters)
at Autofac.ResolutionExtensions.Resolve[TService](IComponentContext context)
at MyStore_Intranet.App.SetupBootstrapper() in C:\Users\Hans\documents\visual studio 2017\Projects\MyStoreIntranet\MyStore Intranet\App.xaml.cs:line 74
at MyStore_Intranet.App.OnStartup(StartupEventArgs e) in C:\Users\Hans\documents\visual studio 2017\Projects\MyStoreIntranet\MyStore Intranet\App.xaml.cs:line 28
at System.Windows.Application.<.ctor>b__1_0(Object unused)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.DispatcherOperation.InvokeImpl()
at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
at System.Windows.Threading.DispatcherOperation.Invoke()
at System.Windows.Threading.Dispatcher.ProcessQueue()
at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
at System.Windows.Application.RunDispatcher(Object ignore)
at System.Windows.Application.RunInternal(Window window)
at System.Windows.Application.Run(Window window)
at System.Windows.Application.Run()
at MyStore_Intranet.App.Main()
> Inner Exception 1:
DependencyResolutionException: An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = CompanyService (ReflectionActivator), Services = [MyStore_Intranet.Models.Interfaces.ICompanyService], Lifetime = Autofac.Core.Lifetime.CurrentScopeLifetime, Sharing = None, Ownership = OwnedByLifetimeScope
> Inner Exception 2:
DependencyResolutionException: An error occurred during the activation of a particular registration. See the inner exception for details. Registration: Activator = CompanyRepository (ReflectionActivator), Services = [MyStore_Intranet.DataAccess.Interfaces.Interfaces.ICompanyRepository], Lifetime = Autofac.Core.Lifetime.CurrentScopeLifetime, Sharing = None, Ownership = OwnedByLifetimeScope
> Inner Exception 3:
DependencyResolutionException: None of the constructors found with 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' on type 'MyStore_Intranet.DataAccess.SQL.CompanyRepository' can be invoked with the available services and parameters:
Cannot resolve parameter 'MyStore_Intranet.DataAccess.Interfaces.Generic.IGenericSQLRepository`1[MyStore_Intranet.Models.SharedObjects.Company] repository' of constructor 'Void .ctor(MyStore_Intranet.DataAccess.Interfaces.Generic.IGenericSQLRepository`1[MyStore_Intranet.Models.SharedObjects.Company])'.
我不知道问题是什么。我希望你能帮助我。
编辑：根据要求
public class GenericSQLRepository<T> : ObservableObject<T>, IGenericSQLRepository<T> where T : class, IEntity
{
private DbSet<T> _dbset;
private MyStoreDataContext _context;
public GenericSQLRepository(MyStoreDataContext context)
{
_context = context;
_dbset = _context.Set<T>();
}
public async Task<Tuple<bool, IList<T>, Exception>> All()
{
try
{
return new Tuple<bool, IList<T>, Exception>(true, await _dbset.AsNoTracking().ToListAsync().ConfigureAwait(false), null);
}
catch (Exception ex)
{
return new Tuple<bool, IList<T>, Exception>(false, null, ex);
}
}
public async Task<Tuple<bool, IList<T>, Exception>> AllNotDeleted()
{
try
{
return new Tuple<bool, IList<T>, Exception>(true, await _dbset.AsNoTracking().ToListAsync().ConfigureAwait(false), null);
}
catch (Exception ex)
{
return new Tuple<bool, IList<T>, Exception>(false, null, ex);
}
}
public async Task<Tuple<bool, IList<T>, Exception>> All(Func<IQueryable<T>, IOrderedQueryable<T>> orderby)
{
try
{
IQueryable<T> dbQuery = _dbset.AsNoTracking();
if (orderby != null)
{
dbQuery = orderby(dbQuery);
}
return new Tuple<bool, IList<T>, Exception>(true, await dbQuery.ToListAsync().ConfigureAwait(false), null);
}
catch (Exception ex)
{
return new Tuple<bool, IList<T>, Exception>(false, null, ex);
}
}
public async Task<Tuple<bool, IList<T>, Exception>> FindBy(Expression<Func<T, bool>> predicate)
{
try
{
return new Tuple<bool, IList<T>, Exception>(true, await _dbset.AsNoTracking().Where(predicate).ToListAsync().ConfigureAwait(false), null);
}
catch (Exception ex)
{
return new Tuple<bool, IList<T>, Exception>(false, null, ex);
}
}
public async Task<Tuple<bool, IList<T>, Exception>> FindBy(Expression<Func<T, bool>> predicate, Func<IQueryable<T>, IOrderedQueryable<T>> orderby)
{
try
{
IQueryable<T> dbQuery = _dbset.AsNoTracking();
if (orderby != null)
{
dbQuery = orderby(dbQuery);
}
return new Tuple<bool, IList<T>, Exception>(true, await dbQuery.Where(predicate).ToListAsync().ConfigureAwait(false), null);
}
catch (Exception ex)
{
return new Tuple<bool, IList<T>, Exception>(false, null, ex);
}
}
public async Task<Tuple<bool, T, Exception>> FindByKey(Guid id)
{
try
{
return new Tuple<bool, T, Exception>(true, await _dbset.AsNoTracking().SingleOrDefaultAsync(q => q.ID == id).ConfigureAwait(false), null);
}
catch (Exception ex)
{
return new Tuple<bool, T, Exception>(false, null, ex);
}
}
public async Task<Tuple<bool, IList<T>, Exception>> AllInclude(params Expression<Func<T, object>>[] includeproperties)
{
try
{
return new Tuple<bool, IList<T>, Exception>(true, await GetAllIncluding(includeproperties).ToListAsync().ConfigureAwait(false), null);
}
catch (Exception ex)
{
return new Tuple<bool, IList<T>, Exception>(false, null, ex);
}
}
public async Task<Tuple<bool, IList<T>, Exception>> AllInclude(Func<IQueryable<T>, IOrderedQueryable<T>> orderby, params Expression<Func<T, object>>[] includeproperties)
{
try
{
return new Tuple<bool, IList<T>, Exception>(true, await GetAllIncluding(orderby, includeproperties).ToListAsync().ConfigureAwait(false), null);
}
catch (Exception ex)
{
return new Tuple<bool, IList<T>, Exception>(false, null, ex);
}
}
public async Task<Tuple<bool, IList<T>, Exception>> FindByInclude(Expression<Func<T, bool>> predicate, params Expression<Func<T, object>>[] includeproperties)
{
try
{
var query = GetAllIncluding(includeproperties);
return new Tuple<bool, IList<T>, Exception>(true, await query.Where(predicate).ToListAsync().ConfigureAwait(false), null);
}
catch (Exception ex)
{
return new Tuple<bool, IList<T>, Exception>(false, null, ex);
}
}
public async Task<Tuple<bool, IList<T>, Exception>> FindByInclude(Expression<Func<T, bool>> predicate, Func<IQueryable<T>, IOrderedQueryable<T>> orderby, params Expression<Func<T, object>>[] includeproperties)
{
try
{
var query = GetAllIncluding(orderby, includeproperties);
return new Tuple<bool, IList<T>, Exception>(true, await query.Where(predicate).ToListAsync().ConfigureAwait(false), null);
}
catch (Exception ex)
{
return new Tuple<bool, IList<T>, Exception>(false, null, ex);
}
}
private IQueryable<T> GetAllIncluding(params Expression<Func<T, object>>[] includeproperties)
{
var queryable = _dbset.AsNoTracking();
return includeproperties.Aggregate(queryable,
(q, includeproperty) => (DbQuery<T>)q.Include(includeproperty));
}
private IQueryable<T> GetAllIncluding(Func<IQueryable<T>, IOrderedQueryable<T>> orderby, params Expression<Func<T, object>>[] includeproperties)
{
IQueryable<T> dbQuery = _dbset.AsNoTracking();
if (orderby != null)
{
dbQuery = orderby(dbQuery);
}
return includeproperties.Aggregate(dbQuery, (q, includeproperty) => (DbQuery<T>)q.Include(includeproperty));
}
public async Task<Tuple<bool, T, Exception>> Add(T entity)
{
try
{
_context.Set<T>().Add(entity);
var result = await _context.SaveChangesAsync().ConfigureAwait(false);
return result > 0 ? new Tuple<bool, T, Exception>(true, entity, null) : new Tuple<bool, T, Exception>(false, entity, null);
}
catch (Exception ex)
{
return new Tuple<bool, T, Exception>(false, null, ex);
}
}
public async Task<Tuple<bool, T, Exception>> Update(T entity)
{
try
{
_dbset.AddOrUpdate(entity);
var result = await _context.SaveChangesAsync().ConfigureAwait(false);
return result > 0 ? new Tuple<bool, T, Exception>(true, entity, null) : new Tuple<bool, T, Exception>(false, entity, null);
}
catch (Exception ex)
{
return new Tuple<bool, T, Exception>(false, null, ex);
}
}
public async Task<Tuple<bool, IList<T>, Exception>> Update(List<T> entities)
{
try
{
foreach (var entity in entities)
{
_dbset.AddOrUpdate(entity);
}
var result = await _context.SaveChangesAsync().ConfigureAwait(false);
return result > 0 ? new Tuple<bool, IList<T>, Exception>(true, entities, null) : new Tuple<bool, IList<T>, Exception>(false, entities, null);
}
catch (Exception ex)
{
return new Tuple<bool, IList<T>, Exception>(false, null, ex);
}
}
public async Task<Tuple<bool, T, Exception>> Delete(T entity)
{
try
{
var objtodelete = _dbset.Find(entity.ID);
if (objtodelete == null)
return new Tuple<bool, T, Exception>(false, null, new Exception("Object Is Null Even Though Its Not Supposed Too"));
_dbset.Remove(objtodelete);
var result = await _context.SaveChangesAsync().ConfigureAwait(false);
return result > 0 ? new Tuple<bool, T, Exception>(true, entity, null) : new Tuple<bool, T, Exception>(false, entity, null);
}
catch (Exception ex)
{
return new Tuple<bool, T, Exception>(false, null, ex);
}
}
public override void Dispose()
{
_dbset = null;
_context = null;
}
}
public class CompanyRepository : ICompanyRepository
{
private IGenericSQLRepository<Company> _repository;
public CompanyRepository(IGenericSQLRepository<Company> repository)
{
_repository = repository;
}
public async Task<Tuple<bool, Company, Exception>> Add(Company entity)
{
return await _repository.Add(entity).ConfigureAwait(false);
}
public async Task<Tuple<bool, Company, Exception>> Delete(Company entity)
{
return await _repository.Delete(entity).ConfigureAwait(false);
}
public async Task<Tuple<bool, Company, Exception>> Update(Company entity)
{
return await _repository.Update(entity).ConfigureAwait(false);
}
public async Task<Tuple<bool, Company, Exception>> Find(Guid id)
{
return await _repository.FindByKey(id).ConfigureAwait(false);
}
public async Task<Tuple<bool, IList<Company>, Exception>> All()
{
return await _repository.All(q => q.OrderBy(qq => qq.Name)).ConfigureAwait(false);
}
public async Task<Tuple<bool, IList<Company>, Exception>> AllNotDeleted()
{
return await _repository.FindBy(q => !q.IsDeleted, q => q.OrderBy(qq => qq.Name)).ConfigureAwait(false);
}
public async Task<Tuple<bool, IList<Company>, Exception>> AllOwnCompanies()
{
return await _repository.FindBy(q => q.IsOwnCompany, q => q.OrderBy(qq => qq.Name)).ConfigureAwait(false);
}
public async Task<Tuple<bool, IList<Company>, Exception>> AllOwnCompaniesNotDeleted()
{
return await _repository.FindBy(q => !q.IsDeleted && q.IsOwnCompany, q => q.OrderBy(qq => qq.Name)).ConfigureAwait(false);
}
public async Task<Tuple<bool, IList<Company>, Exception>> AllExceptOwnCompanies()
{
return await _repository.FindBy(q => !q.IsOwnCompany, q => q.OrderBy(qq => qq.Name)).ConfigureAwait(false);
}
public async Task<Tuple<bool, IList<Company>, Exception>> AllExceptCompaniesNotDeleted()
{
return await _repository.FindBy(q => !q.IsDeleted && !q.IsOwnCompany, q => q.OrderBy(qq => qq.Name)).ConfigureAwait(false);
}
public void Dispose()
{
_repository = null;
}
}
答案 0 :(得分：0)
我似乎找到了原因。为了能够在通用代码中使用一些搜索，我已经声明了包含密钥的接口IEntity。关键是在所有模型继承的基类中。 GenericSqlRepository继承了IEntity，但我忘了在基类中继承它。
答案 1 :(得分：0)
DependencyResolutionException: None of the constructors found with 'Autofac.Core.Activators.Reflection.DefaultConstructorFinder' on type 'MyStore_Intranet.DataAccess.SQL.CompanyRepository' can be invoked with the available services and parameters:
Cannot resolve parameter 'MyStore_Intranet.DataAccess.Interfaces.Generic.IGenericSQLRepository`1[MyStore_Intranet.Models.SharedObjects.Company] repository' of constructor 'Void .ctor(MyStore_Intranet.DataAccess.Interfaces.Generic.IGenericSQLRepository`1[MyStore_Intranet.Models.SharedObjects.Company])'.
CompanyRepository有一个需要IGenericSQLRepository<Company>的构造函数，但IGenericSQLRepository<Company>未在Autofac中注册。如果我查看你的注册：
builder.RegisterGeneric(typeof(GenericSQLRepository<>))
.As(typeof(IGenericSQLRepository<>))
.WithParameter("context", new MyStoreDataContext(connString))
.InstancePerLifetimeScope();
您注册了As(typeof(IGenericSQLRepository<>)))，但我认为您需要AsClosedTypesOf(...)：
builder.RegisterGeneric(typeof(GenericSQLRepository<>))
.AsClosedTypesOf(typeof(IGenericSQLRepository<>))
.WithParameter("context", new MyStoreDataContext(connString))
.InstancePerLifetimeScope();