プロパティ/フィールド インジェクション

If the object has a local default and Inject is optional, Property/Field Injection can be used.

class ClassA
{
    [Inject]
    IServiceA serviceA { get; set; } // Will be overwritten if something is registered.

    public ClassA()
    {
        serviceA = ServiceA.GoodLocalDefault;
    }
}

It can resolve like this:

    [Inject]
    IServiceA serviceA;

Property/Field Injection with Keys

同じインターフェイスや型の複数の実装が異なるキーで登録されている場合、Key 属性と Inject を使用することで、どの実装をインジェクトするかを指定することができます：

class WeaponHolder
{
    [Inject]
    [Key(WeaponType.Primary)]
    public IWeapon PrimaryWeapon { get; set; }
    
    [Inject]
    [Key("orc")]
    public IEnemy OrcEnemy { get; set; }
    
    [Inject]
    [Key(2)]
    ILevel nextLevel;
}

注記

When using keys with property or field injection, you must use both the Inject and Key attributes. The Key attribute alone is not sufficient for property or field injection.

注記

The Key attribute must be used with types that have been registered with the corresponding key using the .Keyed() method. See the Register with Keys section for more information.