inversion-of-control - Constructor Injection to access service

Question

Is there a better way to consume a service in mvvmcross by constructor injection? For example, I have my object in a plugin implementation

public class MyObject : IMyObject
{
   public MyObject (int id) 
   {
      _id = id;
   }
}

and want to consume it somewhere the portable core (in the buisness layer) like this :

public void ConsumeTheService()
{
    int i = 50;
    var myObject = this.GetService<IMyObject>(i);
}

Actually, I only use a setter to get my id back in the implementation.

score 0 · Accepted Answer

我不确定我是否理解您的示例-不确定intValue在GetService

不管：

MvvmCross v3 包括构造函数注入 - 请参阅http://slodge.blogspot.co.uk/2013/03/v3-new-viewmodel-lifecycle.html上的一些详细信息
其他人也在 vNext 中实现了构造函数注入 - 例如https://github.com/gshackles/CrossBar/和http://slodge.blogspot.co.uk/2013/02/a-second-take-on-constructor-injection .html
MvvmCross 中的 IoC 是完全可替换的 - 因此如果您愿意，您可以使用其他 IoC 机制（但这确实需要您提供一些代码）

score 0 · Accepted Answer

在您更新之后......如果您询问如何获得：

    var myObject = this.GetService<IMyObject>(50);

并为此返回一个初始化为的对象new MyObject(50)

那么我建议您实现一个接口

public interface IMyObjectFactory
{
    IMyObject CreateMyObject(int i);
}

有一个实现：

public class MyObjectFactory : IMyObjectFactory
{
    public IMyObject CreateMyObject(int i)
    {
        return new MyObject(i);
    }
}

然后你可以IMyObjectFactory用 IoC注册它

2 回答 2