public void TestGetTypeParamConstraints()
{
Type gcClass = typeof(GenericConstrainedClass <, , ,>);
Type[] typeparams = gcClass.GetGenericArguments();
Type tParam = typeparams[0];
Type uParam = typeparams[1];
Type vParam = typeparams[2];
Type wParam = typeparams[3];
var tExpected = new TypeConstraint[] { TypeConstraint.Struct };
var uExpected = new TypeConstraint[] { TypeConstraint.Class, TypeConstraint.Ctor };
var vExpected = new TypeConstraint[] { TypeConstraint.TypeParam(3) };
var wExpected = new TypeConstraint[] { TypeConstraint.Type(new MemberRef("", MemberRefType.Class, typeof(TestClass).MetadataToken)) };
AssertTypeConstraints(tExpected, utility.GetTypeParamConstraints(tParam));
AssertTypeConstraints(uExpected, utility.GetTypeParamConstraints(uParam));
AssertTypeConstraints(vExpected, utility.GetTypeParamConstraints(vParam));
AssertTypeConstraints(wExpected, utility.GetTypeParamConstraints(wParam));
}
public IReadOnlyList <TypeConstraint> GetTypeParamConstraints(Type typeParam)
{
Check.Ref(typeParam);
Check.Cond(typeParam.IsGenericParameter, "typeParam must be a generic parameter type");
List <TypeConstraint> constraints = new List <TypeConstraint>();
var attr = typeParam.GenericParameterAttributes;
if (attr.HasFlag(GenericParameterAttributes.NotNullableValueTypeConstraint))
{
constraints.Add(TypeConstraint.Struct);
}
else
{
if (attr.HasFlag(GenericParameterAttributes.ReferenceTypeConstraint))
{
constraints.Add(TypeConstraint.Class);
}
if (attr.HasFlag(GenericParameterAttributes.DefaultConstructorConstraint))
{
constraints.Add(TypeConstraint.Ctor);
}
foreach (var constraint in typeParam.GetGenericParameterConstraints())
{
if (constraint.IsGenericParameter)
{
int pos = constraint.GenericParameterPosition;
constraints.Add(TypeConstraint.TypeParam(pos));
}
else
{
MemberRef mRef = new MemberRef(constraint.Name, GetMemberRefType(constraint), constraint.MetadataToken);
constraints.Add(TypeConstraint.Type(mRef));
}
}
}
return(constraints.ToArray());
}