REST地獲取JSON列表

Question

我在寫一個簡單的RESTful控制器。到目前爲止，我可以通過調用http://127.0.0.1:8080/api/employee/5來檢索Employee類型的單個JSON對象。但是在致電http://127.0.0.1:8080/api/employee/時，我無法檢索到Employee對象的集合。這給我以下錯誤。

<Error> 
<Message> 
No HTTP resource was found that matches the request URI 'http://127.0.0.1:8080/api/employee/'. 
</Message> 
<MessageDetail> 
No type was found that matches the controller named 'employee'. 
</MessageDetail> 
</Error> 

當我嘗試保存新員工時，會發生同樣的事情。

EmployeeApiController.cs

[RoutePrefix("api/employee")] 
public class EmployeeApiController : ApiController 
{ 

    readonly EmployeePersistence persistence; 

    public EmployeeApiController() 
    { 
     persistence = new EmployeePersistence(); 
    } 

    [HttpPost] 
    public void Post([FromBody] Employee employee) // DOESN'T WORK 
    { 
     // saving id for the debugging purposes 
     long id = persistence.SaveEmployee(employee); 
    } 

    [HttpGet] 
    [Route("{id:long}")] 
    public IHttpActionResult GetEmployee(long id) // WORKS 
    { 
     return Ok(
      new Employee("Bobby", "Smedley", 
         "London", "Teheran", 
         EmployeeGender.M, 
         DepartmentCode.D_21570, 
         "12345678901")); 
    } 

    [HttpGet] 
    public IHttpActionResult ListEmployees() // DOESN'T WORK 
    { 
     return Ok(
      new List<Employee> { 
       new Employee("Bobby", "Smedley", 
         "London", "Teheran", 
         EmployeeGender.M, 
         DepartmentCode.D_21570, 
         "12345678901"), 

       new Employee("Robbie", "Medleigh", 
         "Liverpool", "Teheran", 
         EmployeeGender.M, 
         DepartmentCode.D_21570, 
         "12345678901")}); 
    } 
} 

任何想法，爲什麼每個ID的作品得到的，卻得到了一個列表，產後不要在這裏工作？

UPDATE 添加Route導致以下問題ListEmployees以上：

<Error> 
<Message>An error has occurred.</Message> 
<ExceptionMessage> 
The 'ObjectContent`1' type failed to serialize the response body for content type 'application/xml; charset=utf-8'. 
</ExceptionMessage> 
<ExceptionType>System.InvalidOperationException</ExceptionType> 
<StackTrace/> 
<InnerException> 
<Message>An error has occurred.</Message> 
<ExceptionMessage> 
Type 'MyWebService.Models.Employee' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute. Alternatively, you can ensure that the type is public and has a parameterless constructor - all public members of the type will then be serialized, and no attributes will be required. 
</ExceptionMessage> 
<ExceptionType> 
System.Runtime.Serialization.InvalidDataContractException 
</ExceptionType> 

RouteConfig.cs

public class RouteConfig 
{ 
    public static void RegisterRoutes(RouteCollection routes) 
    { 
     routes.IgnoreRoute("{resource}.axd/{*pathInfo}"); 

     routes.MapRoute(
      name: "Default", 
      url: "{controller}/{action}/{id}", 
      defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional } 
     ); 
    } 
} 

Answer 1

您可以在ListEmployees操作添加屬性[Route]或檢查你的路線表

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