使用Unity填充收集的方式 [英] Way to fill collection with Unity

问题描述

我有两个示例类

class ClassToResolve
{
    private List<CollectionItem> _coll;

    public ClassToResolve(List<CollectionItem> coll)
    {
        _coll = coll;
    }
}

class CollectionItem
{
    //...
}

，我需要解决ClassToResolve

and I need to resolve ClassToResolve

var classToResolve = new ClassToResolve(
            new List<CollectionItem>()
                {
                    new CollectionItem(),
                    new CollectionItem(),
                    new CollectionItem()
                }

            );

现在我以某种方式解决了

Now I resolve it in a way

var classToResolve = new ClassToResolve(
            new List<CollectionItem>()
                {
                    unity.Resolve<CollectionItem>(),
                    unity.Resolve<CollectionItem>(),
                    unity.Resolve<CollectionItem>()
                }
            );

有没有办法使用动态注册来解决使用Unity的ClassToResolve？

Is there a way to resolve ClassToResolve with Unity using dynamic registration?

推荐答案

Unity将明白 T [] （array）事物列表（但不是 IEnumerable< T> ，而不是列表< T> ）。当您将 ClassToResolve 的构造函数更改为采用 CollectionItem [] 而不是列表< CollectionItem> 可以如下配置 CollectionItem 类型：

Unity will understand that T[] (array) dependencies are a list of things (but not IEnumerable<T>, nor List<T>). When you change the constructor of ClassToResolve to take an CollectionItem[] instead of a List<CollectionItem> you can configure your CollectionItem types as follows:

container.RegisterType<CollectionItem, CollectionItemA>("a");
container.RegisterType<CollectionItem, CollectionItemB>("b");
container.RegisterType<CollectionItem, CollectionItemC>("c");
container.RegisterType<CollectionItem, CollectionItemD>("d");

这里的诀窍是命名所有注册。默认（无名）注册将永远不会是Unity中序列依赖关系的一部分。

The trick here is to name all the registrations. A default (nameless) registration will never be part of a sequence dependency in Unity.

现在您可以解析 ClassToResolve 而不需要注册：

Now you can resolve ClassToResolve without the need to register it:

container.Resolve<ClassToResolve>();

如果你注意列表< CollectionItem> 您可以添加以下注册：

If you rather inject List<CollectionItem> you can add the following registration:

container.RegisterType<IList<CollectionItem>, CollectionItem[]>();

而对于 IEnumerable< CollectionItem> 添加以下行：

container
  .RegisterType<IEnumerable<CollectionItem>, CollectionItem[]>();

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