c#之在 c# webapi 中创建超媒体的正确方法

我正在研究如何为特定资源实现超媒体，但找不到真正的实现示例，只是抽象...

你知道，在各种文章中，这个人创建了如下方法:

public List<Link> CreateLinks(int id) 
{ 
    ...//Here the guy put these three dots, whyyyyyyyyyy? 
} 

我目前拥有的:

public Appointment Post(Appointment appointment) 
    { 
        //for sake of simplicity, just returning same appointment 
        appointment = new Appointment{ 
            Date = DateTime.Now, 
            Doctor = "Dr. Who", 
             Slot = 1234, 
            HyperMedia = new List<HyperMedia> 
            { 
                new HyperMedia{ Href = "/slot/1234", Rel = "delete" }, 
                new HyperMedia{ Href = "/slot/1234", Rel = "put" }, 
            } 
        }; 
 
        return appointment; 
    } 

还有约会类:

public class Appointment 
{ 
    [JsonProperty("doctor")] 
    public string Doctor { get; set; } 
 
    [JsonProperty("slot")] 
    public int Slot { get; set; } 
    [JsonProperty("date")] 
    public DateTime Date { get; set; } 
 
    [JsonProperty("links")] 
    public List<HyperMedia> HyperMedia { get; set; } 
} 
 
public class HyperMedia 
{ 
    [JsonProperty("rel")] 
    public string Rel { get; set; } 
 
    [JsonProperty("href")] 
    public string Href { get; set; } 
} 

有没有合适的方法呢？我的意思是，没有对链接进行硬编码？如何为给定类型(即约会类)动态创建它们？

我使用的是 c# Webapi，而不是 c# MVC。

请您参考如下方法:

1. 要将路由动态添加到 HyperMedia 集合，您可以使用路由命名:

   • 使用特定名称定义您的路线(例如删除):

     [Route("{id:int}", Name = "AppointmentDeletion")] 
     public IHttpActionResult Delete(int slot) 
     { 
         //your code 
     } 
     

   • 使用UrlHelper.Link方法:

     public Appointment Post(Appointment appointment) 
     { 
         appointment = new Appointment 
         { 
             HyperMedia = new List<HyperMedia> 
             { 
                 new HyperMedia 
                 {  
                     Href = Url.Link("AppointmentDeletion", new { slot = 1234 }),  
                     Rel = "delete"  
                 } 
             } 
      
         return appointment; 
     };  
     

2. 也可以在不为每个类声明 HyperMedia 属性的情况下向结果对象动态添加链接:

   • 定义一个没有链接的类:

     public class Appointment 
     { 
         [JsonProperty("doctor")] 
         public string Doctor { get; set; } 
      
         [JsonProperty("slot")] 
         public int Slot { get; set; } 
      
         [JsonProperty("date")] 
         public DateTime Date { get; set; } 
     }  
     

   • 定义一个扩展方法:

     public static class LinkExtensions 
     { 
         public static dynamic AddLinks<T>(this T content, params object[] links) 
         { 
             IDictionary<string, object> result = new ExpandoObject(); 
      
             typeof (T) 
                 .GetProperties(BindingFlags.Public | BindingFlags.Instance) 
                 .ToList() 
                 .ForEach(_ => result[_.Name.ToLower()] = _.GetValue(content)); 
      
             result["links"] = links; 
      
             return result; 
         } 
     } 
     

   • 使用它:

     public IHttpActionResult Post(Appointment appointment) 
     { 
         return Ok(appointment.AddLinks(new HyperMedia 
         {  
             Href = Url.Link("AppointmentDeletion", new { slot = 1234 }),  
             Rel = "delete"  
         })); 
     }