UnityDependencyResolver can't resolve Enum

Question

I work with .Net Framework 4.7 and UnityDependencyResolver. My customer write a constructor with an Enum as the parameter and UnityDependencyResolver cannot initialize this constructor.

I guess the Enum parameter is the cause of the problem. I tried to search using the keyword "UnityDependencyResolver can't resolve Enum", but couldn't find any explanation.

Can someone give me accurate information or a satisfactory explanation? Look forward to the help.

Mark Seemann · Accepted Answer · 2024-01-25 16:50:36Z

1

It's been so long ago since I wrote Dependency Injection in .NET that I no longer really remember how this works, but according to it:

Conceptually, it doesn’t always make much sense to register a string or number as a component in a container. However, with Unity this is at least possible.

Consider, as an example, this constructor:
public ChiliConCarne(Spiciness spiciness)
In this example, Spiciness is an enum:
public enum Spiciness
{
    Mild = 0,
    Medium,
    Hot
}
[...]

If you want all consumers of Spiciness to use the same value, you can register Spiciness and ChiliConCarne independently of each other:
container.RegisterInstance(Spiciness.Medium);
container.RegisterType<ICourse, ChiliConCarne>();
When you subsequently resolve ChiliConCarne it will have a Medium Spiciness, as will all other components with a DEPENDENCY on Spiciness.

Have you registered the enum value with the container?

answered Jan 25, 2024 at 16:50

Mark Seemann

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1 Comment

DucHo Over a year ago

Just like you said. But you need to get the enum type and here is my Visual Basic code container.RegisterInstance(GetType(Spiciness), Spiciness.Medium).

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