RMS.API.Web/Areas/HelpPage/XmlDocumentationProvider.cs

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using System;
using System.Globalization;
using System.Linq;
using System.Reflection;
using System.Web.Http.Controllers;
using System.Web.Http.Description;
using System.Xml.XPath;
using RMS.API.Web.Areas.HelpPage.ModelDescriptions;

namespace RMS.API.Web.Areas.HelpPage
{
    /// <summary>
    /// A custom <see cref="IDocumentationProvider"/> that reads the API documentation from an XML documentation file.
    /// </summary>
    public class XmlDocumentationProvider : IDocumentationProvider, IModelDocumentationProvider
    {
        private XPathNavigator _documentNavigator;
        private const string TypeExpression = "/doc/members/member[@name='T:{0}']";
        private const string MethodExpression = "/doc/members/member[@name='M:{0}']";
        private const string PropertyExpression = "/doc/members/member[@name='P:{0}']";
        private const string FieldExpression = "/doc/members/member[@name='F:{0}']";
        private const string ParameterExpression = "param[@name='{0}']";

        /// <summary>
        /// Initializes a new instance of the <see cref="XmlDocumentationProvider"/> class.
        /// </summary>
        /// <param name="documentPath">The physical path to XML document.</param>
        public XmlDocumentationProvider(string documentPath)
        {
            if (documentPath == null)
            {
                throw new ArgumentNullException("documentPath");
            }
            XPathDocument xpath = new XPathDocument(documentPath);
            _documentNavigator = xpath.CreateNavigator();
        }

        public string GetDocumentation(HttpControllerDescriptor controllerDescriptor)
        {
            XPathNavigator typeNode = GetTypeNode(controllerDescriptor.ControllerType);
            return GetTagValue(typeNode, "summary");
        }

        public virtual string GetDocumentation(HttpActionDescriptor actionDescriptor)
        {
            XPathNavigator methodNode = GetMethodNode(actionDescriptor);
            return GetTagValue(methodNode, "summary");
        }

        public virtual string GetDocumentation(HttpParameterDescriptor parameterDescriptor)
        {
            ReflectedHttpParameterDescriptor reflectedParameterDescriptor = parameterDescriptor as ReflectedHttpParameterDescriptor;
            if (reflectedParameterDescriptor != null)
            {
                XPathNavigator methodNode = GetMethodNode(reflectedParameterDescriptor.ActionDescriptor);
                if (methodNode != null)
                {
                    string parameterName = reflectedParameterDescriptor.ParameterInfo.Name;
                    XPathNavigator parameterNode = methodNode.SelectSingleNode(String.Format(CultureInfo.InvariantCulture, ParameterExpression, parameterName));
                    if (parameterNode != null)