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我特别使用C#与Ninject,但问题不仅仅局限于Ninject。我的问题是,我有几个类具有不同的构造函数参数加上注入的。我知道我可以使用kernel.Get<MyObject>(constructor args here)
来实例化对象。这对我来说并不合适,因为我将内核遍布整个地方。我会尽力列出下面的例子。依赖注入的创建模式
我现在拥有的一切:
public interface IStore<T>
{
void CommitToDatabase(T item);
}
public abstract class Thing
{
private IStore<Thing> _store;
protected Thing(object key, IStore<Thing> store)
{
Key = key;
_store = store;
}
public object Key { get; private set; }
public virtual void Update()
{
_store.CommitToDatabase(this);
}
}
public class Person :Thing
{
public Person(object key, string name, int age, IStore<Thing> store)
: base(key, store)
{
Name = name;
Age = age;
}
public string Name { get; private set; }
public int Age { get; private set; }
}
public class Car :Thing
{
public Car(object key, int year, string make, string model, IStore<Thing> store)
: base(key, store)
{
Year = year;
Make = make;
Model = model;
}
public int Year { get; private set; }
public string Make { get; private set; }
public string Model { get; private set; }
}
我知道Ninject我可以做到以下几点:
kernel.Get<Car>(new ConstructorArgument("key", 1), new ConstructorArgument("year", 2010), new ConstructorArgument("make", "Astin Martin"), new ConstructorArgument("model", "Vanquish"));
但并不觉得我的权利。我想要做的是改变它有一个Initialize方法,但我不知道这是最佳做法还是有更好的方法。
可能出现的新的东西:
public interface IStore<T>
{
void CommitToDatabase(T item);
}
public abstract class Thing
{
private IStore<Thing> _store;
protected bool _isInitialised;
protected Thing(IStore<Thing> store)
{
Key = null;
_store = store;
_isInitialised = false;
}
public object Key { get; private set; }
public virtual void Initialize(object key)
{
if (!_isInitialised) {
Key = key;
_isInitialised = true;
}
}
public virtual void Update()
{
_store.CommitToDatabase(this);
}
protected bool IsInitialised()
{
return _isInitialised;
}
}
public class Person :Thing
{
public Person(IStore<Thing> store)
: base(store)
{
Name = string.Empty;
Age = int.MinValue;
}
public string Name { get; private set; }
public int Age { get; private set; }
public void Initialize(object key, string name, int age)
{
if (!base.IsInitialised()) {
Name = name;
Age = age;
}
base.Initialize(key);
}
}
public class Car :Thing
{
public Car(IStore<Thing> store)
: base(store)
{
Year = 0;
Make = "Ford";
Model = "Model T";
}
public int Year { get; private set; }
public string Make { get; private set; }
public string Model { get; private set; }
public void Initialize(object key, int year, string make, string model)
{
if (!base.IsInitialised()) {
Year = year;
Make = make;
Model = model;
}
base.Initialize(key);
}
}
问: 是“可能的新的东西”的普遍做法,好主意,好主意执行不力,或者是有没有更好的方式来完全做到这一点?
我认为让您的实体首先意识到持久性机制是个坏主意。您可以考虑使用Repository模式。 – tvanfosson