项目梳理4——WebApi项目，使用注释填充Description字段

web.config中添加连接字符串：

为webapi添加Description，使用注释来填充此字段

对于所有引用的xxxx.base项目设置生成的xml文档，注意release、debug下都需设置，并重新生成

xxxxx.WebApi\Areas\HelpPage\XmlDocumentationProvider.cs中，添加构造函数，用于解析xml文件：

        /// <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();
        }

xxxxx.WebApi\Areas\HelpPage\App_Start\HelpPageConfig.cs中，，Register(HttpConfiguration config)方法的开头，添加代码：

            var server = HttpContext.Current.Server;
            String[] xmlFiles = System.IO.Directory.GetFiles(server.MapPath("~/App_Data"), "*.xml");
            if (xmlFiles == null || xmlFiles.Length == 0)
            {
                xmlFiles = System.IO.Directory.GetFiles(server.MapPath("~/Bin"), "*.xml");
            }

            if (xmlFiles != null && xmlFiles.Length > 0)
            {
                MultipleXmlDocumentationProvider mp = new MultipleXmlDocumentationProvider(xmlFiles);
                config.SetDocumentationProvider(mp);
            }

xxxxx.WebApi\Areas\HelpPage路径下添加MultipleXmlDocumentationProvider.cs　　

 public class MultipleXmlDocumentationProvider : IDocumentationProvider, IModelDocumentationProvider
    {
        List<XmlDocumentationProvider> _listProviders = new List<XmlDocumentationProvider>();
        public MultipleXmlDocumentationProvider(params String[] xmlDocPaths)
        {
            InitDocuments(xmlDocPaths);
        }

        /// <summary>
        /// 初始化文档，主要修复SeeAlso部分内容
        /// </summary>
        /// <param name="xmlDocPaths">xml文档路径</param>
        protected void InitDocuments(params String[] xmlDocPaths)
        {
            var listXmlDocs = new List<XDocument>();
            foreach (var xmlPath in xmlDocPaths)
            {
                var content = System.IO.File.ReadAllText(xmlPath);
                listXmlDocs.Add(XDocument.Parse(content));
            }

            var dictNameNodes = new Dictionary<String, XElement>();
            foreach (var xmlDoc in listXmlDocs)
            {
                var methodNodes = xmlDoc.Root.Descendants().Where(n => n.Name.LocalName == "member");
                foreach (var mn in methodNodes)
                {
                    var name = mn.Attribute("name").Value;
                    dictNameNodes[name] = mn;
                }
            }

            foreach (var xmlDoc in listXmlDocs)
            {
                var saNodes = xmlDoc.Root.Descendants().Where(n => n.Name.LocalName == "seealso").ToList();
                foreach(var saNode in saNodes)
                {
                    if (saNode.Attribute("cref") == null) continue;
                    var crefValue = saNode.Attribute("cref").Value;
                    if (dictNameNodes.ContainsKey(crefValue))
                    {
                        var a = dictNameNodes[crefValue];
                        XLinqUtil.ReplaceOuterXml(saNode, XLinqUtil.InnerXML(a));
                    }
                    //XLinqUtil.ReplaceInnerXml(saNode,)
                }
            }

            foreach (var xmlDoc in listXmlDocs)
            {
                using (var ms = new System.IO.StringReader(xmlDoc.ToString(SaveOptions.OmitDuplicateNamespaces)))
                {
                    _listProviders.Add(new XmlDocumentationProvider(ms));
                }
            }
        }

        public string GetDocumentation(System.Web.Http.Controllers.HttpParameterDescriptor parameterDescriptor)
        {
            String result = null;
            foreach (var provider in _listProviders)
            {
                result = provider.GetDocumentation(parameterDescriptor);
                if (result != null) return result;
            }
            return result;
        }

        public string GetDocumentation(System.Web.Http.Controllers.HttpActionDescriptor actionDescriptor)
        {
            String result = null;
            foreach (var provider in _listProviders)
            {
                result = provider.GetDocumentation(actionDescriptor);
                if (result != null) return result;
            }
            return result;
        }

        public string GetDocumentation(System.Web.Http.Controllers.HttpControllerDescriptor controllerDescriptor)
        {
            String result = null;
            foreach (var provider in _listProviders)
            {
                result = provider.GetDocumentation(controllerDescriptor);
                if (result != null) return result;
            }
            return result;
        }

        public string GetResponseDocumentation(System.Web.Http.Controllers.HttpActionDescriptor actionDescriptor)
        {
            String result = null;
            foreach (var provider in _listProviders)
            {
                result = provider.GetResponseDocumentation(actionDescriptor);
                if (result != null) return result;
            }
            return result;
        }

        public string GetDocumentation(System.Reflection.MemberInfo member)
        {
            String result = null;
            foreach (var provider in _listProviders)
            {
                result = provider.GetDocumentation(member);
                if (result != null) return result;
            }
            return result;
        }

        public string GetDocumentation(Type type)
        {
            String result = null;
            foreach (var provider in _listProviders)
            {
                result = provider.GetDocumentation(type);
                if (result != null) return result;
            }
            return result;
        }
    }