DocumentationProvider using NuDoc

XmlDocumentationProvider.cs

namespace Hediet.Reflection
{
    interface IDocumentationProvider
    {
        string GetDocumentationText(MemberInfo memberInfo);
        string GetDocumentationText(ParameterInfo memberInfo);
    }

    class XmlDocumentationProvider : IDocumentationProvider
    {
        private readonly Dictionary<MemberInfo, Member> documentation = new Dictionary<MemberInfo, Member>();

        private Member GetXmlDocumentation(MemberInfo memberInfo)
        {
            Member member;
            if (!documentation.TryGetValue(memberInfo, out member))
            {
                var r = DocReader.Read(memberInfo.Module.Assembly);
                foreach (var element in r.Elements.OfType<Member>())
                {
                    if (memberInfo == element.Info)
                    {
                        member = element;
                        break;
                    }
                }
                documentation.Add(memberInfo, member);
            }

            return member;
        }

        public string GetDocumentationText(MemberInfo memberInfo)
        {
            var member = GetXmlDocumentation(memberInfo);
            if (member == null)
                return null;
            var summary = member.Elements.OfType<Summary>().FirstOrDefault();
            if (summary == null)
                return null;
            return summary.ToText();
        }

        public string GetDocumentationText(ParameterInfo parameterInfo)
        {
            var member = GetXmlDocumentation(parameterInfo.Member);
            if (member == null)
                return null;
            var summary = member.Elements.OfType<Param>().FirstOrDefault(p => p.Name == parameterInfo.Name);
            if (summary == null)
                return null;
            return summary.ToText();
        }
    }
}