大家晚上好。 目前，我是IoC / DI的新人。我有一个带C＃的Winform项目。请查看一些代码并帮我解决以下问题：
1 / IRepository
namespace Framework.Repositories
{
public interface IRepository<T> : IDisposable where T:class
{
T Get(int id);
IEnumerable<T> GetAll();
IEnumerable<T> Find(Expression<Func<T, bool>> predicate);
}
}
2 /存储库
namespace Framework.Repositories
{
public class Repository<T> : IRepository<T> where T : class
{
private bool _disposed = false;
private static bool _isTransactionStarted;
protected readonly DbContext Context;
private DbContextTransaction _transaction { get; set; }
public Repository(DbContext context)
{
Context = context;
_isTransactionStarted = false;
if (context == null)
throw new NullReferenceException(nameof(context));
if (Context.Set<T>() == null)
throw new NullReferenceException("_context.Set<T>()");
}
public T Get(int id) => Context.Set<T>().Find(id);
public IEnumerable<T> GetAll() => Context.Set<T>().ToList();
public IEnumerable<T> Find(Expression<Func<T, bool>> predicate) => Context.Set<T>().Where(predicate);
}
}
3 / Model
namespace PRO.Model
{
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Data.Entity.Spatial;
[Table("Employee")]
public partial class Employee
{
[Key]
public long EmpId { get; set; }
[StringLength(15)]
public string Username { get; set; }
public string Password { get; set; }
[StringLength(50)]
public string UserGroup { get; set; }
[Required]
[StringLength(50)]
public string FirstName { get; set; }
[StringLength(50)]
public string LastName { get; set; }
[Required]
[StringLength(1)]
public string EmpStatus { get; set; }
}
}
4 / IEmployeeRepository
namespace PRO.Repositories
{
public interface IEmployeeRepository:IRepository<Employee>
{
Employee UserLogin(string username, string password);
}
}
5 / EmployeeRepository
namespace PRO.Repositories
{
public class EmployeeRepository : Repository<Employee>,IEmployeeRepository
{
public EmployeeRepository(DbContext context) : base(context)
{
}
public Employee UserLogin(string username, string password)
{
try
{
return Find(x=>x.Username == username && x.Password == password && x.EmpStatus == BooleanType.Yes ).FirstOrDefault();
}
catch (Exception ex)
{
throw new RepositoryException(ex);
}
}
public MyDbContext myDbContext => Context as MinhTamHotelDbContext;
}
}
6 / IEmployeeService
namespace PRO.Services
{
public interface IEmployeeService
{
Employee UserLogin(string username, string password);
}
}
7 / EmployeeService
namespace PRO.Services
{
public class EmployeeService : IEmployeeService
{
public IEmployeeRepository EmployeeRepos { get; set; }
public Employee UserLogin(string username, string password)
{
return EmployeeRepos.UserLogin(username, password);
}
}
}
8 / DbContext
namespace PRO.Repositories
{
using System.Data.Entity;
public partial class MyHotelDbContext: DbContext
{
public MyHotelDbContext()
: base("name=MyHotelDbContext")
{
}
public virtual DbSet<Employee> Employees { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
//DbContext Here
}
}
}
9 / App.config中
<configSections>
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
<section name="unity" type="Microsoft.Practices.Unity.Configuration.UnityConfigurationSection, Microsoft.Practices.Unity.Configuration, Version=2.1.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
</configSections>
<connectionStrings>
<add name="MinhTamHotelDbContext" connectionString="data source=.;initial catalog=WiF;persist security info=True;user id=sa;password=@success@;MultipleActiveResultSets=True;App=EntityFramework" providerName="System.Data.SqlClient" />
</connectionStrings>
<alias alias="transient" type="Microsoft.Practices.Unity.TransientLifetimeManager, Microsoft.Practices.Unity, Version=2.1.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
<alias alias="perResolve" type="Microsoft.Practices.Unity.PerResolveLifetimeManager, Microsoft.Practices.Unity, Version=2.1.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
<alias alias="singleton" type="Microsoft.Practices.Unity.ContainerControlledLifetimeManager, Microsoft.Practices.Unity, Version=2.1.505.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
<alias alias="AreaRepository" type="PRO.Repositories.AreaRepository, PRO.Repositories, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<alias alias="IAreaRepository" type="PRO.Repositories.IAreaRepository, PRO.Repositories, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<alias alias="EmployeeRepository" type="PRO.Repositories.EmployeeRepository, PRO.Repositories, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<alias alias="IEmployeeRepository" type="PRO.Repositories.IEmployeeRepository, PRO.Repositories, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<alias alias="GnrlCodeRepository" type="PRO.Repositories.GnrlCodeRepository, PRO.Repositories, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<alias alias="IGnrlCodeRepository" type="PRO.Repositories.IGnrlCodeRepository, PRO.Repositories, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<alias alias="AreaService" type="PRO.Services.AreaService, PRO.Services, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<alias alias="IAreaService" type="PRO.Services.IAreaService, PRO.Services, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<alias alias="EmployeeService" type="PRO.Services.EmployeeService, PRO.Services, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<alias alias="IEmployeeService" type="PRO.Services.IEmployeeService, PRO.Services, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<alias alias="GnrlCodeService" type="PRO.Services.GnrlCodeService, PRO.Services, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<alias alias="IGnrlCodeService" type="PRO.Services.IGnrlCodeService, PRO.Services, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<alias alias="IRepository" type="Framework.Repositories.IRepository, Framework.Repositories, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<alias alias="Repository" type="Framework.Repositories.Repository, Framework.Repositories, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" />
<container>
<register type="IAreaRepository" mapTo="AreaRepository">
<lifetime type="perResolve" />
</register>
<register type="IEmployeeRepository" mapTo="EmployeeRepository">
<lifetime type="perResolve" />
</register>
<register type="IGnrlCodeRepository" mapTo="GnrlCodeRepository">
<lifetime type="perResolve" />
</register>
<register type="IEmployeeService" mapTo="EmployeeService">
<property name="EmployeeRepos" dependencyType="IEmployeeRepository" />
<lifetime type="perResolve" />
</register>
<register type="IGnrlCodeService" mapTo="GnrlCodeService">
<property name="GnrlCodeRepos" dependencyType="IGnrlCodeRepository" />
<lifetime type="perResolve" />
</register>
<register type="IAreaService" mapTo="AreaService">
<property name="AreaRepos" dependencyType="IAreaRepository" />
<lifetime type="perResolve" />
</register>
</container>
10 /在我的登录表单中
public partial class UserLogin : Form
{
private IEmployeeService _employeeSvr = null;
public IEmployeeService EmployeeSrv
{
get { return _employeeSvr ?? (_employeeSvr = UnityInstanceProvider.CreateInstance<IEmployeeService>()); }
set { _employeeSvr = value; }
}
private void btnLogin_Click(object sender, System.EventArgs e)
{
try
{
this.Cursor = Cursors.WaitCursor;
var employee = EmployeeSrv.UserLogin(txtUsername.Text.TrimEx(), txtPassword.Text.TrimEx());
//MsgBox.ShowInfoMsg(employee.ToJsonObject().ToStringEx());
if (employee != null)
{
Visible = false;
AreaMap.Instance.Show();
}
}
catch (Exception ex)
{
ex.ExceptionHandler();
}
finally
{
this.Cursor = Cursors.Default;
}
}
}
我的错误是：
Resolution of the dependency failed, type = "PRO.Services.IEmployeeService", name = "(none)".
Exception occurred while: while resolving.
Exception is: InvalidOperationException - The type DbConnection does not have an accessible constructor.
-----------------------------------------------
At the time of the exception, the container was:
Resolving PRO.Services.EmployeeService,(none) (mapped from PRO.Services.IEmployeeService, (none))
Resolving value for property EmployeeService.EmployeeRepos
Resolving PRO.Repositories.EmployeeRepository,(none) (mapped from PRO.Repositories.IEmployeeRepository, (none))
Resolving parameter "context" of constructor PRO.Repositories.EmployeeRepository(System.Data.Entity.DbContext context)
Resolving System.Data.Entity.DbContext,(none)
Resolving parameter "existingConnection" of constructor System.Data.Entity.DbContext(System.Data.Common.DbConnection existingConnection, System.Data.Entity.Infrastructure.DbCompiledModel model, System.Boolean contextOwnsConnection)
Resolving System.Data.Common.DbConnection,(none)
有人可以帮我解决这个问题吗？ 如果Unity不支持多重继承（EmployeeRepository：Repository，IEmployeeRepository），还有其他方法可以替换Unity吗？
非常感谢