How to Resolve Multiple Service Implementations with Custom Keys in ASP.NET Core?

Use the custom key to resolve multiple services in ASP.NET CORE to achieve

When registering multiple specific implementation of the same interface in ASP.NET CORE, you may encounter definition unique keys to distinguish their restrictions. However, you can use the commission to analyze the appropriate implementation when runtime to solve this problem.

For this, please follow the steps below:

Definition and sharing commission:

1. Create a commission called

   , it accepts a key and returns a
   instance.
   • ServiceResolver IService
   Registering specific implementation and mapping keys:

2. Use to register each specific implementation in the file.

   Add a
   • Inspector registration. In this registration, use the statement to use the AddTransient to map the key to the corresponding specific implementation. Startup.cs
   • ServiceResolver switch Use serverEsolver: GetService
In the class registered through DI, use
3. to obtain the real implementation. Pass the proper keys as a parameter to the parser.
   Example:
   • ServiceResolver
   Note:
This solution will not solve the problem of the data injection constructor during the registration period. For this reason, please consider exploring other mechanisms, such as

or custom container implementation.

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