在统一只能有一个默认的注册（没有名字的注册在 container.RegisterType<的IFoo，Foo1>（）;
）。如果多个默认登记执行，最后一个胜

为了注册多个实现相同的接口，你需要指定名称的注册：

  container.RegisterType<的IFoo，Foo1>（registration1）; 
 container.RegisterType<的IFoo和Foo2>（registration2）; 
 

此外，统一才明白默认阵列。如果你想解决一个数组，那么你将被罚款与缺省行为。否则，你将需要注册阵列和你有兴趣，喜欢收集之间的映射：

  container.RegisterType< IEnumerable的&LT ;的IFoo>中的IFoo []≥（）; 
 

另外要注意的是，解决集合时默认的注册将不予退还。
为例给出：

  container.RegisterType<的IFoo，Foo1>（）; 
 container.RegisterType<的IFoo和Foo2>（registration1）; 
 container.RegisterType<的IFoo，Foo3>（registration2）; 
 container.RegisterType&所述; IEnumerable的&下; IFoo的>中的IFoo []≥（）; 
 

如果您解决的IEnumerable<的IFoo> ，其结果将只包含 foo2的和 Foo3 ，但不会有实例 Foo1 ，因为未包括默认的注册。

I want to do a simple resolve of multiple type registrations (ultimately constructor injected, but using .Resolve to see if Unity is even capable of such things.

In every case below, Unity resolves 0 items where it should be resolving 2.

Is there some switch in unity that turns on post-2007 behavior? Or am I just drastically missing something?

Here is my code:

public interface IFoo {}
public class Foo1 : IFoo{}
public class Foo2 : IFoo{}

class Program
{
    static void Main(string[] args)
    {
        var container = new UnityContainer();
        container.RegisterType<IFoo, Foo1>();
        container.RegisterType<IFoo, Foo2>();

        // container.Resolve<IEnumerable<IFoo>>();   returns 0
        // container.ResolveAll<IFoo>(); returns 0

        var foos = container.Resolve<IFoo[]>();
        Console.WriteLine(foos.Count());

        Console.ReadLine();

    }
}

In Unity there can only be one default registration (A registration without a name as in container.RegisterType<IFoo, Foo1>(); ). If multiple default registrations are performed, the last one wins.

In order to register multiple implementation for the same interface, you need to assign names to those registrations:

container.RegisterType<IFoo, Foo1>("registration1");
container.RegisterType<IFoo, Foo2>("registration2");

Also, Unity only understand arrays by default. If you want to resolve as an array then you will be fine with the default behaviour. Otherwise you will need to register a mapping between the array and the collection you are interested in, like:

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

Another important note is that the default registration won't be returned when resolving a collection. For example given:

container.RegisterType<IFoo, Foo1>();
container.RegisterType<IFoo, Foo2>("registration1");
container.RegisterType<IFoo, Foo3>("registration2");
container.RegisterType<IEnumerable<IFoo>, IFoo[]>();

If you resolve IEnumerable<IFoo>, the result will only contain instances of Foo2 and Foo3, but there will not be an instance of Foo1 because the default registration is not included.