Slender.Scanner 1.0.0

Slender.Scanner

A better way to find types within assemblies.

What are the advantages of using Slender.Scanner?

• Slender.Scanner uses the visitor pattern, so it does most of the work for you. Just override methods to define your logic.
• The entry point of the visitor is an interface, allowing you to write unit tests for your visitor. Just mock up a scanned assembly and verify your logic.

How do I use Slender.Scanner?

Step 1 - Define types in an assembly.

public interface IInterface { }

public abstract class BaseClass { }

public class Implementation : BaseClass, IInterface { }

Step 2 - Define a visitor that inherts from AssemblyScanVisitor.

public class Visitor : Slender.Scanner.AssemblyScanVisitor
{

}

Step 3 - Override the Visitor's Visit methods to implement specific behaviours.

Example 1: Registering services in an IServiceCollection.

public class Visitor(IServiceCollection services) : Slender.Scanner.AssemblyScanVisitor
{

    protected override void VisitAbstractAndImplementations(Type abstractType, IEnumerable<Type> implementationTypes)
    {
        foreach (var _ImplementationType in implementationTypes)
            services.AddScoped(abstractType, _ImplementationType);
    }

    protected override void VisitInterfaceAndImplementations(Type interfaceType, IEnumerable<Type> implementationTypes)
    {
        foreach (var _ImplementationType in implementationTypes)
            services.AddScoped(interfaceType, _ImplementationType);
    }

}

Example 2: Verifying a service implementation exists.

public class Visitor(Type serviceType) : Slender.Scanner.AssemblyScanVisitor
{

    public bool DoesServiceImplementationExist { get; private set; }

    protected override void VisitInterfaceAndImplementations(Type interfaceType, IEnumerable<Type> implementationTypes)
    {
        if (interfaceType == serviceType)
            this.DoesServiceImplementationExist = true;
    }

}

Example 3: Finding types with a specific attribute.

public class Visitor(List<Type> typesWithAttribute) : Slender.Scanner.AssemblyScanVisitor
{

    protected override void VisitType(Type type)
    {
        if (type.CustomAttributes.Any(a => a.AttributeType == typeof(Attribute)))
            typesWithAttribute.Add(type);
    }

}

Step 4 - Visiting an assembly.

var _Visitor = new Visitor();
var _AssemblyScan = AssemblyScan.FromAssembly(typeof(Visitor).Assembly);

_Visitor.VisitAssemblyScan(_AssemblyScan);

Docs

Interested in learning more? Check out the docs.

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