一、添加包Microsoft.AspNet.WebApi.HelpPage可以自动给api生成帮助页面，url:/help
二、help加注释：
1.
2.
public static class HelpPageConfig
{
[SuppressMessage("Microsoft.Globalization", "CA1303:Do not pass literals as localized parameters",
MessageId = "WebApplication2.Areas.HelpPage.TextSample.#ctor(System.String)",
Justification = "End users may choose to merge this string with existing localized resources.")]
[SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly",
MessageId = "bsonspec",
Justification = "Part of a URI.")]
public static void Register(HttpConfiguration config)
{
//// Uncomment the following to use the documentation from XML documentation file.
config.SetDocumentationProvider(new XmlDocumentationProvider(HttpContext.Current.Server.MapPath("~/bin/WebApplication2.XML")));