[英]Using Automapper with generics
I have a base class Repository which contains base functionality for a set of classes that inherit from it such as UserRepository or DepartmentRepository. 我有一个基类存储库,它包含从中继承的一组类的基本功能,例如UserRepository或DepartmentRepository。
I'm using automapper to map between my entity framework objects and my domain objects. 我正在使用自动映射器在实体框架对象和域对象之间进行映射。
public class Repository<TEntity> : IRepository<TEntity> where TEntity : class {
protected readonly DbContext Context;
public Repository(DbContext context) {
Context = context;
}
public TEntity Get(int id) {
return Context.Set<TEntity>().Find(id);
}
}
public class UserRepository : Repository<User>, IUserRepository {
public UserRepository(DbContext context) : base(context) {
}
public User GetUserByNTId(string NTId) {
return Mapper.Map<User>(DbContext.Users.SingleOrDefault(u => u.NTId == NTId));
}
}
GetUserByNTId
will work because I can use automapper in the return statement. GetUserByNTId
将起作用,因为我可以在return语句中使用自动映射器。 But Get
will not work because it deals with TEntity
and I don't know how you can tell automapper to examine the type of TEntity
and look for a matching mapping. 但是
Get
不能使用,因为它处理TEntity
而且我不知道如何告诉自动映射器检查TEntity
的类型并查找匹配的映射。
How can I change the return statement of the Get function so that it will work for all my derived repositories and still use automapper? 如何更改Get函数的return语句,以使其对我的所有派生存储库都有效,并且仍然使用automapper? Or do I just have to take all my general functions and push them down into the derived classes and eliminate the Repository base class?
还是只需要接受所有通用功能并将其推入派生类并消除Repository基类?
It's a very bad idea to for mixing AutoMapper and other responsibilities when querying from a Repository pattern . 从存储库模式查询时,混合使用AutoMapper和其他职责是一个非常糟糕的主意。 It's also of course a violation of the Single Responsibility Principle .
当然,这也违反了“ 单一责任原则” 。
A naive non tested implementation will be: 一个未经测试的天真的实现将是:
public class ExampleOfGenericRepository<TEntity> : Repository<TEntity>
where TEntity : class
{
public ExampleOfGenericRepository(DbContext context)
: base(context)
{
}
public TEntity GetById(int id)
{
return Mapper.Map<TEntity>(Get(id));
}
}
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