public static bool TryConvertMarkupExtension(AstTransformationContext context,
IXamlAstValueNode node, out XamlMarkupExtensionNode o)
{
var cache = context.GetOrCreateItem <MarkupExtensionProvideValueCache>();
o = null;
var nodeType = node.Type.GetClrType();
if (!cache.TypeToProvideValue.TryGetValue(nodeType, out var provideValue))
{
var candidates = GetMarkupExtensionProvideValueAlternatives(context, nodeType).ToList();
var so = context.Configuration.WellKnownTypes.Object;
var sp = context.Configuration.TypeMappings.ServiceProvider;
// Try non-object variant first and variants without IServiceProvider argument first
provideValue = candidates.FirstOrDefault(m => m.Parameters.Count == 0 && !m.ReturnType.Equals(so))
?? candidates.FirstOrDefault(m => m.Parameters.Count == 0)
?? candidates.FirstOrDefault(m =>
m.Parameters.Count == 1 && m.Parameters[0].Equals(sp) &&
!m.ReturnType.Equals(so))
?? candidates.FirstOrDefault(m =>
m.Parameters.Count == 1 && m.Parameters[0].Equals(sp));
cache.TypeToProvideValue[nodeType] = provideValue;
}
if (provideValue == null)
{
if (node.Type.IsMarkupExtension)
{
throw new XamlParseException(
$"{node.Type.GetClrType().GetFqn()} was resolved as markup extension, but doesn't have a matching ProvideValue/ProvideTypedValue method",
node.Type);
}
return(false);
}
o = new XamlMarkupExtensionNode(node, provideValue, node);
return(true);
}
public static IReadOnlyList <IXamlMethod> FindPossibleAdders(AstTransformationContext context,
IXamlType type)
{
IReadOnlyList <IXamlMethod> FindPossibleAddersImpl()
{
var known = context.Configuration.WellKnownTypes;
// Attempt to cast IEnumerable and IEnumerable<T> to IList<T>
var actualType = type;
if (actualType.Equals(known.IEnumerable))
{
actualType = known.IList;
}
if (actualType.GenericTypeDefinition?.Equals(known.IEnumerableT) == true)
{
actualType = known.IListOfT.MakeGenericType(actualType.GenericArguments[0]);
}
var inspectTypes = new List <IXamlType>();
inspectTypes.Add(actualType);
inspectTypes.AddRange(actualType.GetAllInterfaces());
// If type supports IList<T> don't fall back to IList
if (inspectTypes.Any(t => t.GenericTypeDefinition?.Equals(known.IListOfT) == true))
{
inspectTypes = inspectTypes.Where(t => !t.Equals(known.IList)).ToList();
}
var rv = new List <IXamlMethod>();
foreach (var t in inspectTypes)
{
foreach (var m in t.FindMethods(m => m.Name == "Add" && m.IsPublic && !m.IsStatic &&
(m.Parameters.Count == 1 || m.Parameters.Count == 2)))
{
if (rv.Any(em => em.Equals(m)))
{
continue;
}
rv.Add(m);
}
}
// First use methods from the type itself, then from base types, then from interfaces
rv = rv
.OrderByDescending(x => x.ThisOrFirstParameter().Equals(actualType))
.ThenBy(x => x.ThisOrFirstParameter().IsInterface)
.ToList();
// Add casts
for (var c = 0; c < rv.Count; c++)
{
if (!rv[c].ThisOrFirstParameter().Equals(type))
{
rv[c] = new XamlMethodWithCasts(rv[c], new[] { type }.Concat(rv[c].Parameters));
}
}
return(rv);
}
var cache = context.GetOrCreateItem <AdderCache>();
if (cache.TryGetValue(type, out var rvr))
{
return(rvr);
}
else
{
return(cache[type] = FindPossibleAddersImpl());
}
}