How to Resolve/inject Dependency for Attribute based class?

Question

I am creating the following attribute class in an ASP.NET Core 6 Web API.

I need to make a database call from this class and want to get dbContext which is already registered with dependency container.

How do I inject the dbcontext into my customAuthorization class ?

[AttributeUsage(AttributeTargets.Class)]
public class CustomAuthorization : Attribute, IAuthorizationFilter
{
   private readonly IServiceProvider _serviceProvider;
    
   public CustomAuthorization(IServiceProvider serviceProvider)
   {
          _serviceProvider = serviceProvider;
   }


   public void OnAuthorization(AuthorizationFilterContext filterContext)
   {
       ...................
   }

}

[CustomAuthorization()]
public class OrganizationController : CustomControllerBaseClass
{
    // .......
}

The issue is not in the filter calls but with the Declaration of Attribute on OrganizationController , it expects IServiceProvider to be passed in from Customauthorixation class — NSS
– NSS, Commented Jan 29, 2023 at 18:38

Ergis · Accepted Answer · 2023-01-29 21:30:28Z

2

IAuthorizationFitler has a OnAuthorization(AuthorizationFilterContext filterContext) method, doesn't it?
You could use the filterContext.HttpContext.ServiceProvider.GetRequiredService....

[AttributeUsage(AttributeTargets.Class)]
public class CustomAuthorization : Attribute, IAuthorizationFilter
{
    public void OnAuthorization(AuthorizationFilterContext filterContext)
    {
        var context = filterContext.HttpContext.ServiceProvider.GetRequiredService<Your_DbContext>();  
        ...                                      
    }
}

Though, I don't know the scope of the AuthorizationFilter, whether it's singleton, scoped or transient: if it's singleton, you could create a scope on your own:

using(var scope = filterContext.HttpContext.ServiceProvider.CreateScope())
{
    var context = scope.ServiceProvider.GetRequiredService<Your_DbContext>();  
    ...                                      
}

I don't know whether I'm wrong somewhere OR there is an easier approach, but this is my quick response.

edited Jan 29, 2023 at 21:30

answered Jan 29, 2023 at 18:38

Ergis

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3 Comments

NSS Over a year ago

The signature for OnAuthorization is different in .net public void OnAuthorization(AuthorizationFilterContext filterContext) { }

NSS Over a year ago

Actually this link helped stackoverflow.com/a/69310490/1764116

Ergis Over a year ago

@nss Just a typo, sorry. Edited!

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