创建使用Unity对象解决额外的参数 [英] Creating objects using Unity Resolve with extra parameters

问题描述

我使用的棱镜，这使是很好的统一IoC容器了。我是新来的概念，所以我还没有得到我的手都围绕它。我想现在要做的就是创建一个使用IoC容器，而是传递一个额外的参数也是一个对象。请允许我用一个例子说明..：

我有一个类，需要一个命令对象。这是注册在IoC容器，所以它会处理它很好：

 公共类Person
{
    公众人物（IApplicationCommands命令）{..}
    ..
}

人人= _container.Resolve＆LT;人＆GT;（）;
 

现在 - 我想通过另一种说法 - 例如：的人的名字。不过，我还是想使用IoC容器来处理解决，因此从IoC容器得到其他paramenters。但通过在名称为自定义的参数。可以这样做？

 公共类Person
{
    公众人物（IApplicationCommands命令字符串名称）{..}
    ..
}

字符串名称=约翰;
人人= _container.Resolve＆LT;人＆GT;（名称）; // ....？
 

这个例子似乎并没有工作，但有什么办法，使其工作？或者没有统一的IoC容器要求所有要在容器中注册呼叫解决之前的参数？

解决方案

编辑：这个答案已经过时了，在我看来，是因为它有统一的旧版本的假设。 NotDan的回答是更好的。

---

您已经有了几个选择。他们是诚实有点跛，但他们的工作。

选项1：作用域货柜

  

如果你想使用构造函数   注射，你需要创建一个   范围内的容器，并把你的数据   到该范围的容器：

  IUnityContainer子容器= _container.CreateChildContainer（）;

//不要这样......创造出比字符串的自定义类型，如
// MyConstructorParams或类似的东西...这得到点跨越。
subContainer.RegisterInstance＆LT;字符串＆GT;（约翰福音）;
人人= subContainer.Resolve＆LT;人＆GT;（）;
 

选项2：初始化方法

  

我通常做的，虽然是有   在单独的初始化方法我   实例变量目标对象：

 公共类Person
{
     公众人物（IApplicationCommands命令）
     {..}
     公共无效初始化（字符串名称）{..}

     ..
}
 

然后您的使用情况变为：

 人员的人= container.Resolve＆LT;人＆GT;（）;
person.Initialize（约翰福音）;
 

也不是特别愉快，但它会完成这项工作。最重要的是选择一个公约，并坚持下去，否则你会得到一个有点失落。

希望这有助于。

I'm using Prism, which gives be the nice Unity IoC container too. I'm new to the concept, so I haven't gotten my hands all around it yet. What I want to do now is to create an object using the IoC container, but passing an extra parameter too. Allow me to explain with an example..:

I have a class that takes a commands object. This is registered in the IoC container, so it will handle it nicely:

public class Person 
{
    public Person(IApplicationCommands commands) { .. }
    ..
}

Person person = _container.Resolve<Person>();

Now - I want to pass in another argument - e.g. the name of the person. However, I still want to use the IoC container to handle the resolving and hence get the other paramenters from the IoC container. But pass in the name as a "custom" parameter. Can this be done?

public class Person 
{
    public Person(IApplicationCommands commands, string name) { .. }
    ..
}

string name = "John"; 
Person person = _container.Resolve<Person>(name); // ....??

This example doesn't seem to work, but is there a way to make it work? Or does Unity IoC container require all parameters to be registered in the container before calling Resolve?

解决方案

Edit: this answer is obsolete, in my opinion, because it has an assumption of an older version of Unity. NotDan's answer is better.

---

You've got a few options. They are honestly a bit lame, but they will work.

Option 1: Scoped Container

If you want to use constructor injection, you'll need to create a scoped container and put your data into that scoped container:

IUnityContainer subContainer = _container.CreateChildContainer();

//Don't do this... create a custom type other than string, like
// MyConstructorParams or something like that... this gets the point across.
subContainer.RegisterInstance<string>("John");
Person person = subContainer.Resolve<Person>();

Option 2: Initialize Method

What I typically do, though, is have a seperate Initialize method on my target objects for instance variables:

public class Person
{
     public Person(IApplicationCommands commands)
     { .. }
     public void Initialize(string name) { .. }

     ..
}

And then your usage becomes:

Person person = container.Resolve<Person>();
person.Initialize("John");

Neither is particularly pleasant, but it'll get the job done. The important thing is to pick a convention and stick to it, otherwise you'll get a bit lost.

Hope this helps.

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