问题描述
我从尝试了T4模板,但我正在努力与DI(使用StructureMap)示例代码。对于像我这样的DI初学者来说,这还不够它甚至不编译。
我已经用非DI模板完成了一些示例项目。而且它表现出色。我爱,它生成所有必要的存储库,我可以轻松地自定义和扩展它们。但我不能让DI示例工作。有没有类似的项目(更好的文档)?
我通常使用EF端结构图进行以下设置:(大括号, / p>
这是我们用来注入控制器的基本界面:
public interface ISession:IDisposable
{
void CommitChanges();
void Delete< T>(Expression< Func< T,bool>>表达式)其中T:class,new();
void Delete< T>(T item)其中T:class,new();
void DeleteAll< T>()其中T:class,new();
T Single< T>(表达式< Func< T,bool>>表达式)其中T:class,new();
IQueryable< T>所有< T>()其中T:class,new();
void Add< T>(T item)其中T:class,new();
void添加< T>(IEnumerable< T>项)其中T:class,new();
void Update< T>(T item)其中T:class,new();
}
这里一个 ISession
public class EntityFrameworkSession:ISession
{
// MyContext是一个从EF的DbContext继承的类
只读DbContext _context;
public EntityFrameworkSession(DbContext context)
{
_context = context;
}
public void CommitChanges()
{
_context.SaveChanges();
}
public void Delete< T>(Expression< Func< T,bool>>>表达式)
其中T:class,new()
{
var query = All< T>()。Where(expression);
foreach(查询中的var项)
{
删除(item);
}
}
public void Delete< T>(T item)其中T:class,new()
{
_context.Set&T ;()。除去项目);
}
public void DeleteAll< T>()其中T:class,new()
{
var query = All< T>
foreach(查询中的var项)
{
删除(item);
}
}
public void Dispose()
{
_context.Dispose();
}
public T Single< T>(Expression< Func< T,bool>>>表达式)
其中T:class,new()
{
return All< T>()。FirstOrDefault(expression);
}
public IQueryable< T>所有< T>()其中T:class,new()
{
return _context.Set&T;()。AsQueryable();
}
public void Add< T>(T item)其中T:class,new()
{
_context.Set (项目);
}
public void添加< T>(IEnumerable< T>项目)其中T:class,new()
{
foreach(项目中的项目)
{
Add(item);
}
}
public void Update< T>(T item)其中T:class,new()
{
//这里不需要
}
}
现在这个 ISession
实现不是非常方便的注入,因为虽然很好,通用,它没有一个默认的构造函数,所以解决它的方法是写一个小的封装,只暴露一个无参数的构造函数:
///< summary>
///这是EF网站的替代方案
///< / summary>
public class SiteEFSession:EntityFrameworkSession
{
public SiteEFSession():base(new MyContext())
{}
}
现在我们可以很容易地注入它。我们在 StructureMap
中设置如下:
ObjectFactory.Initialize x =>
{
x.For< ISession>()。使用< SiteEFSession>();
});
如果你有一个MVC风格的控制器:
public class HomeController:Controller
{
private readonly ISession _session;
// ISession将自动注入
public HomeController(ISession session)
{
_session = session;
}
}
你去了。这是一个helluva的代码,但你可以将它复制/粘贴到您的解决方案中,您应该很好去。
I tried the T4-Template from http://efrepository.codeplex.com, but I'm struggling with the DI (uses StructureMap) Example code. It's just not enough for a DI beginner like me. It doesn't even compile.
I already have done a few sample projects with its Non-DI Template. And it worked out great. I love, that it generates all necessary repositories and that I can easily customize and extend them. But I can't get the DI Examples working. Are there any similar projects (with better docs)?
I normally use the following setup with EF end Structure map: (brace yourself, bunch o' code coming up).
This is the base interface we'll use to inject our controllers:
public interface ISession : IDisposable
{
void CommitChanges();
void Delete<T>(Expression<Func<T, bool>> expression) where T : class, new();
void Delete<T>(T item) where T : class, new();
void DeleteAll<T>() where T : class, new();
T Single<T>(Expression<Func<T, bool>> expression) where T : class, new();
IQueryable<T> All<T>() where T : class, new();
void Add<T>(T item) where T : class, new();
void Add<T>(IEnumerable<T> items) where T : class, new();
void Update<T>(T item) where T : class, new();
}
And here an ISession
implementation with EF in mind:
public class EntityFrameworkSession : ISession
{
// MyContext is a class inheriting from EF's DbContext
readonly DbContext _context;
public EntityFrameworkSession(DbContext context)
{
_context = context;
}
public void CommitChanges()
{
_context.SaveChanges();
}
public void Delete<T>(Expression<Func<T, bool>> expression)
where T : class, new()
{
var query = All<T>().Where(expression);
foreach (var item in query)
{
Delete(item);
}
}
public void Delete<T>(T item) where T : class, new()
{
_context.Set<T>().Remove(item);
}
public void DeleteAll<T>() where T : class, new()
{
var query = All<T>();
foreach (var item in query)
{
Delete(item);
}
}
public void Dispose()
{
_context.Dispose();
}
public T Single<T>(Expression<Func<T, bool>> expression)
where T : class, new()
{
return All<T>().FirstOrDefault(expression);
}
public IQueryable<T> All<T>() where T : class, new()
{
return _context.Set<T>().AsQueryable();
}
public void Add<T>(T item) where T : class, new()
{
_context.Set<T>().Add(item);
}
public void Add<T>(IEnumerable<T> items) where T : class, new()
{
foreach (var item in items)
{
Add(item);
}
}
public void Update<T>(T item) where T : class, new()
{
//nothing needed here
}
}
Now this ISession
implementation is not very handy to inject because, while being nice and generic, it doesn't have a default constructor, so the way to solve it is by writing a small wrapper that only exposes a parameter-less constructor:
/// <summary>
/// This is the EF site alternative
/// </summary>
public class SiteEFSession : EntityFrameworkSession
{
public SiteEFSession() : base(new MyContext())
{ }
}
Now we can easily inject it. We set it up in StructureMap
as follows:
ObjectFactory.Initialize(x =>
{
x.For<ISession>().Use<SiteEFSession>();
});
And if you have, for instance, an MVC style controller:
public class HomeController : Controller
{
private readonly ISession _session;
// ISession will be injected automatically
public HomeController(ISession session)
{
_session = session;
}
}
There you go. It's a helluva lot of code but you can pretty much copy/paste it into your solution and you should be good to go.
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