webapi help 多XML设置

webapi help具体配置这里不做太多介绍。一般情况下项目都会分层，webapi help 官方给出的实例是在同一个项目下。

如何支持多个项目呢？

1.在HelpPage下增加 MultiXmlDocumentationProvider.cs文件

 1 public class MultiXmlDocumentationProvider : IDocumentationProvider, IModelDocumentationProvider  
 2     {
 3         /********* 
 4        ** Properties 
 5        *********/
 6         /// <summary>The internal documentation providers for specific files.</summary>  
 7         private readonly XmlDocumentationProvider[] Providers;
 8 
 9 
10         /********* 
11         ** Public methods 
12         *********/
13         /// <summary>Construct an instance.</summary>  
14         /// <param name="paths">The physical paths to the XML documents.</param>  
15         public MultiXmlDocumentationProvider(params string[] paths)
16         {
17             this.Providers = paths.Select(p => new XmlDocumentationProvider(p)).ToArray();
18         }
19 
20         /// <summary>Gets the documentation for a subject.</summary>  
21         /// <param name="subject">The subject to document.</param>  
22         public string GetDocumentation(MemberInfo subject)
23         {
24             return this.GetFirstMatch(p => p.GetDocumentation(subject));
25         }
26 
27         /// <summary>Gets the documentation for a subject.</summary>  
28         /// <param name="subject">The subject to document.</param>  
29         public string GetDocumentation(Type subject)
30         {
31             return this.GetFirstMatch(p => p.GetDocumentation(subject));
32         }
33 
34         /// <summary>Gets the documentation for a subject.</summary>  
35         /// <param name="subject">The subject to document.</param>  
36         public string GetDocumentation(HttpControllerDescriptor subject)
37         {
38             return this.GetFirstMatch(p => p.GetDocumentation(subject));
39         }
40 
41         /// <summary>Gets the documentation for a subject.</summary>  
42         /// <param name="subject">The subject to document.</param>  
43         public string GetDocumentation(HttpActionDescriptor subject)
44         {
45             return this.GetFirstMatch(p => p.GetDocumentation(subject));
46         }
47 
48         /// <summary>Gets the documentation for a subject.</summary>  
49         /// <param name="subject">The subject to document.</param>  
50         public string GetDocumentation(HttpParameterDescriptor subject)
51         {
52             return this.GetFirstMatch(p => p.GetDocumentation(subject));
53         }
54 
55         /// <summary>Gets the documentation for a subject.</summary>  
56         /// <param name="subject">The subject to document.</param>  
57         public string GetResponseDocumentation(HttpActionDescriptor subject)
58         {
59             return this.GetFirstMatch(p => p.GetDocumentation(subject));
60         }
61 
62 
63         /********* 
64         ** Private methods 
65         *********/
66         /// <summary>Get the first valid result from the collection of XML documentation providers.</summary>  
67         /// <param name="expr">The method to invoke.</param>  
68         private string GetFirstMatch(Func<XmlDocumentationProvider, string> expr)
69         {
70             return this.Providers
71                 .Select(expr)
72                 .FirstOrDefault(p => !String.IsNullOrWhiteSpace(p));
73         }  
74     }

2.修改/HelpPage/App_Start/HelpPageConfig.cs，原先的不用使用。

config.SetDocumentationProvider(new MultiXmlDocumentationProvider(HttpContext.Current.Server.MapPath("~/Areas/HelpPage/Model.XML"), HttpContext.Current.Server.MapPath("~/Areas/HelpPage/WebApiHelp.XML")));