無法在單個控制器中運行多個GET方法

Question

我使用MySQL DB在visual studio 2015中創建了WEB API。我有三個GET方法。一個是給出所有數據，第二個是給出基於ID的結果，第三個是根據序列號給出結果。前兩種方法是完美的，但最後一種不是。我還在解決方案中添加了多個路由。下面是我的代碼

WebApiConfig

config.Routes.MapHttpRoute(
      name: "DefaultApi", 
      routeTemplate: "api/{controller}/{id}", 
      defaults: new { id = RouteParameter.Optional } 
     ); 



     config.Routes.MapHttpRoute(
     name: "GetByMsn", 
     routeTemplate: "api/{controller}/{action}/{msn}", 
     defaults: null, 
     constraints: new { msn = @"^[a-z]+$" } 

控制器

public HttpResponseMessage Get() 
    { 
     try 
     { 
      return Request.CreateResponse(HttpStatusCode.Found, mEntities.meters_info_dev.ToList()); 
     } 
     catch (Exception ex) 
     { 
      return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex); 
     } 
    } 


    // GET by ID 
    public HttpResponseMessage GetByID(int id) 
    { 
     try 
     { 
      return Request.CreateResponse(HttpStatusCode.Found, mEntities.meters_info_dev.SingleOrDefault(m => m.id == id)); 
     } 
     catch (Exception ex) 
     { 
      return Request.CreateErrorResponse(HttpStatusCode.NotFound, ex); 
     } 
    } 


    // GET by serial number 
    public HttpResponseMessage GetByMsn(string msn) 
    { 
     try 
     { 
      return Request.CreateResponse(HttpStatusCode.Found, mEntities.meters_info_dev.SingleOrDefault(m=> m.meter_msn == msn)); 
     } 
     catch 
     { 
      return Request.CreateErrorResponse(HttpStatusCode.NotFound, "No Data found"); 
     } 
    } 

GetByMsn是不正常的一個。我試圖改變路線，但結果仍然是一樣的。給出的solution 1和solution 2不適用於我。

任何幫助將不勝感激。

Answer 1

config.Routes.MapHttpRoute(
    name: "GetByMsn", 
    routeTemplate: "api/{controller}/{action}/{msn}", 
    defaults: null, 
    constraints: new { msn = @"^[a-z]+$" } 

在上述制約因素的字母，我只是將其更改爲@"^[0-9]+$"並開始爲我工作。