private static IEnumerable <IInstanceCreator> GetGenericCreators(Type targetType, Type genericType)
{
Debug.Assert(targetType != null);
Debug.Assert(genericType != null);
Debug.Assert(genericType.ContainsGenericParameters);
// Get all bindings for the generic type's arguments that satisfy the inheritance constraint.
var openArguments = GenericTypeResolver.GetOpenGenericArguments(genericType);
Assembly[] referenceAssemblies;
LinkList <Constraint> inheritanceConstraints =
targetType.IsGenericParameter
? Constraint.GetConstraints(targetType, out referenceAssemblies)
: Constraint.GetInheritanceConstraint(targetType).MakeLinkList( );
var argumentBindings = new BindingCollection(Binding.EmptyBindings);
Constraint.SatisfyConstraints(argumentBindings, genericType, inheritanceConstraints);
// Construct concrete types for each set of argument bindings,
// and return the creators for each concrete type.
var creators =
from arguments in argumentBindings
let concreteType = GenericTypeResolver.CreateConcreteType(genericType, openArguments, arguments)
where concreteType != null
from creator in TypeCreator.GetInstanceCreators(targetType, concreteType)
select creator;
return(creators);
}
public void CreateConcreteType_returns_null_for_generic_type_with_partial_bindings( )
{
Type type = typeof(IDictionary <,>);
var openArguments = GenericTypeResolver.GetOpenGenericArguments(type);
var bindings = Binding.EmptyBindings.Add(new Binding(openArguments.Value, typeof(int)));
var concreteType = GenericTypeResolver.CreateConcreteType(type, openArguments, bindings);
Assert.Null(concreteType);
}
public void CreateConcreteType_returns_null_for_generic_type_with_no_bindings( )
{
Type type = typeof(Nullable <>);
var openArguments = GenericTypeResolver.GetOpenGenericArguments(type);
var bindings = Binding.EmptyBindings;
var concreteType = GenericTypeResolver.CreateConcreteType(type, openArguments, bindings);
Assert.Null(concreteType);
}
public void CreateConcreteType_succeeds_for_concrete_type( )
{
Type type = typeof(int);
var openArguments = GenericTypeResolver.GetOpenGenericArguments(type);
var bindings = Binding.EmptyBindings;
var concreteType = GenericTypeResolver.CreateConcreteType(type, openArguments, bindings);
Assert.NotNull(concreteType);
Assert.Equal(type, concreteType);
}
public void CreateConcreteType_succeeds_for_generic_type_with_duplicate_bindings( )
{
Type genericType = typeof(Nullable <>);
var openArguments = GenericTypeResolver.GetOpenGenericArguments(genericType);
var bindings = GetBindingList(new[] { new Binding(openArguments.Value, typeof(int)), new Binding(openArguments.Value, typeof(int)) });
var concreteType = GenericTypeResolver.CreateConcreteType(genericType, openArguments, bindings);
Assert.NotNull(concreteType);
Assert.Equal(genericType, concreteType.GetGenericTypeDefinition( ));
var constructedType = genericType.MakeGenericType(typeof(int));
Assert.Equal(constructedType, concreteType);
}
public void CreateConcreteType_succeeds_for_generic_type_with_full_bindings(Type genericType)
{
var openArguments = GenericTypeResolver.GetOpenGenericArguments(genericType);
var bindings = GetBindingList(openArguments.Select((a, i) => new Binding(a, typeof(int))));
var concreteType = GenericTypeResolver.CreateConcreteType(genericType, openArguments, bindings);
Assert.NotNull(concreteType);
Assert.Equal(genericType, concreteType.GetGenericTypeDefinition( ));
Type[] typeArguments = new Type[bindings.Count];
for (int i = 0; i < typeArguments.Length; ++i)
{
typeArguments[i] = typeof(int);
}
var constructedType = genericType.MakeGenericType(typeArguments);
Assert.Equal(constructedType, concreteType);
}
