public static IEnumerable <XamlWriterInternalBase.MemberAndValue> GetSortedConstructorArguments(this XamlType type, IList <XamlWriterInternalBase.MemberAndValue> members)
{
var constructors = type.UnderlyingType.GetTypeInfo().GetConstructors();
var preferredParameterCount = 0;
ConstructorInfo preferredConstructor = null;
foreach (var constructor in constructors)
{
var parameters = constructor.GetParameters();
var matchedParameterCount = 0;
bool mismatch = false;
for (int i = 0; i < parameters.Length; i++)
{
var parameter = parameters[i];
var member = members.FirstOrDefault(r => r.Member.ConstructorArgumentName() == parameter.Name);
if (member == null)
{
// allow parameters with a default value to be omitted
mismatch = !parameter.HasDefaultValue();
if (mismatch)
{
break;
}
continue;
}
var paramXamlType = type.SchemaContext.GetXamlType(parameter.ParameterType);
// check if type input type can be converted to the parameter type
mismatch = !paramXamlType.CanConvertFrom(member.Member.Type);
if (mismatch)
{
break;
}
matchedParameterCount++;
}
// prefer the constructor that accepts the most parameters
if (!mismatch && matchedParameterCount > preferredParameterCount)
{
preferredConstructor = constructor;
preferredParameterCount = matchedParameterCount;
}
}
if (preferredConstructor == null)
{
return(null);
}
return(preferredConstructor
.GetParameters()
.Select(p => {
var mem = members.FirstOrDefault(r => r.Member.ConstructorArgumentName() == p.Name);
if (mem == null && p.HasDefaultValue())
{
mem = new XamlWriterInternalBase.MemberAndValue(type.SchemaContext.GetParameter(p));
mem.Value = p.DefaultValue;
}
return mem;
}));
}
