asp.net core webapi - What is the best way to inject IConfiguration value into services - Stack Overflow

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I am working on ASP.NET Core WebAPI projects with clean architecture, and I came around the situation where I need retrieve value from appsettings.json

I am able to do so by injecting the IConfiguration to the service, like shown below. But it seems like this might not be the best way to do so.

private readonly IConfiguration _config;
public UserService(IConfiguration config)
{
    _config = config;
}

Is there any better way to inject the values into the services.

I am working on ASP.NET Core WebAPI projects with clean architecture, and I came around the situation where I need retrieve value from appsettings.json

I am able to do so by injecting the IConfiguration to the service, like shown below. But it seems like this might not be the best way to do so.

private readonly IConfiguration _config;
public UserService(IConfiguration config)
{
    _config = config;
}

Is there any better way to inject the values into the services.

• asp-core-webapi
• clean-architecture

Share Follow asked Mar 4 at 8:12 Anuj KarkiAnuj Karki 61966 silver badges2929 bronze badges

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2 Answers 2

Sorted by: Reset to default 2

Use the 'options' pattern as documented here and here.

I prefer to take dependencies on my own option types and then use a factory method to take care of the DI. This is not essential, you could just take a dependency on IOptions<T>:

internal class MyCalculator {
    public MyCalculator(CalculatorOptions options) { }
}
 
// ...

builder.Services
    .AddOptions<CalculatorOptions>()
    .BindConfiguration(CalculatorOptions.SectionKey)
    .ValidateOnStart();
 
builder.Services
    .AddSingleton(resolver =>
        resolver.GetRequiredService<IOptions<CalculatorOptions>>().Value);

A service in a layer closer to the "core" could expose strongly typed options and inject them. E.g. a UserService could expose the definition of UserOptions, and doesn't really care about how they are bound.

https://learn.microsoft/en-us/aspnet/core/fundamentals/configuration/options

class UserService(IOptions<UserOptions>) {...}

record UserOptions(Url IdentityEndpoint, ...);

//Program.cs
services.TryAddScoped<UserService>()
        .AddOptions<UserOptions>()
        .BindConfiguration("User")

//appsettings.json
"User": {
  "IdentityEndpoint": "https://identity.yourapp/"
}

Edit: Late to the party

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