40 lines
1.6 KiB
Markdown
40 lines
1.6 KiB
Markdown
|
---
|
||
|
uid: Guides.DI.Scaling
|
||
|
title: Scaling your DI
|
||
|
---
|
||
|
|
||
|
# Scaling your DI
|
||
|
|
||
|
Dependency injection has a lot of use cases, and is very suitable for scaled applications.
|
||
|
There are a few ways to make registering & using services easier in large amounts.
|
||
|
|
||
|
## Using a range of services.
|
||
|
|
||
|
If you have a lot of services that all have the same use such as handling an event or serving a module,
|
||
|
you can register and inject them all at once by some requirements:
|
||
|
|
||
|
- All classes need to inherit a single interface or abstract type.
|
||
|
- While not required, it is preferred if the interface and types share a method to call on request.
|
||
|
- You need to register a class that all the types can be injected into.
|
||
|
|
||
|
### Registering implicitly
|
||
|
|
||
|
Registering all the types is done through getting all types in the assembly and checking if they inherit the target interface.
|
||
|
|
||
|
[!code-csharp[Registering](samples/implicit-registration.cs)]
|
||
|
|
||
|
> [!NOTE]
|
||
|
> As seen above, the interfaceType and activatorType are undefined. For our usecase below, these are `IService` and `ServiceActivator` in order.
|
||
|
|
||
|
### Using implicit dependencies
|
||
|
|
||
|
In order to use the implicit dependencies, you have to get access to the activator you registered earlier.
|
||
|
|
||
|
[!code-csharp[Accessing the activator](samples/access-activator.cs)]
|
||
|
|
||
|
When the activator is accessed and the `ActivateAsync()` method is called, the following code will be executed:
|
||
|
|
||
|
[!code-csharp[Executing the activator](samples/enumeration.cs)]
|
||
|
|
||
|
As a result of this, all the services that were registered with `IService` as its implementation type will execute their starting code, and start up.
|