对于特定的控制器/存储库,我有两种 GET 方法:
public IEnumerable<InventoryItem> GetAllInventoryItems()
{
return inventoryItemsRepository.GetAll();
}
[Route("api/{controller}/{ID}/{CountToFetch}")]
public IEnumerable<InventoryItem> GetBatchOfInventoryItemsByStartingID(string ID, int CountToFetch)
{
return inventoryItemsRepository.Get(ID, CountToFetch);
}
尽管我已经尝试从客户端调用所有这些方式,但有两个参数:
0)
formatargready_uri = string.Format("http://localhost:28642/api/inventoryItems/{0}/{1}", lastIDFetched, RECORDS_TO_FETCH);
var webRequest = (HttpWebRequest)WebRequest.Create(formatargready_uri);
1)
formatargready_uri = string.Format("http://localhost:28642/api/inventoryItems/?ID={0}&CountToFetch={1}", lastIDFetched, RECORDS_TO_FETCH);
var webRequest = (HttpWebRequest)WebRequest.Create(formatargready_uri);
2)
formatargready_uri = string.Format("http://localhost:28642/api/inventoryItems/ID={0}&CountToFetch={1}", lastIDFetched, RECORDS_TO_FETCH);
var webRequest = (HttpWebRequest)WebRequest.Create(formatargready_uri);
...在每种情况下,它仍然是第一个被调用的方法 (GetAll)。为什么?
这是我的存储库代码:
public IEnumerable<InventoryItem> GetAll()
{
return inventoryItems;
}
public IEnumerable<InventoryItem> Get(string ID, int CountToFetch)
{
return inventoryItems.Where(i => 0 < String.Compare(i.Id, ID)).Take(CountToFetch);
}
...这是 WebApiConfig.cs 中的内容:
public static void Register(HttpConfiguration config)
{
config.MapHttpAttributeRoutes();
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);
config.Routes.MapHttpRoute(
name: "DefaultApiWithParameters",
routeTemplate: "api/{controller}/{ID}/{CountToFetch}",
defaults: new { ID = RouteParameter.Optional, CountToFetch = RouteParameter.Optional }
);
}
更新
这将显示我尝试将调用路由到我尝试运行的 Controller 方法:
//[HttpGet]
//[Route("api/{controller}/{ID:string}/{CountToFetch:int}")] <-- throws exception - won't run
//[Route("{controller}/{ID:string}/{CountToFetch:int}")] <-- throws exception - won't run
//[Route("inventoryItems/{ID:string}/{CountToFetch:int}")] <-- throws exception - won't run
//[Route("api/inventoryItems/{ID:string}/{CountToFetch:int}")] <-- throws exception - won't run
//[Route("api/{controller}/{ID}/{CountToFetch}")] // <-- runs, but is not called
[Route("api/InventoryItemsController/{ID}/{CountToFetch}")] // <-- runs, but is not called
//[Route("api/{controller}/{ID:string}/{CountToFetch:int}")] <-- throws exception - won't run
因此,我不想被调用的方法非常健壮:无论我如何装饰另一个方法,或者我如何调用它,不想要的方法都会运行。
更新 2
只允许按名称调用控制器方法不是更容易吗?例如,给定这个 Controller 方法:
public IEnumerable<InventoryItem> GetBatchOfInventoryItemsByStartingID(string ID, int CountToFetch)
{
return inventoryItemsRepository.Get(ID, CountToFetch); //.Where(i => string.Equals(p.Category, category, StringComparison.OrdinalIgnoreCase));
}
...为什么 [c,w] 不会像这样从客户端调用它:
formatargready_uri = string.Format("http://localhost:28642/api/InventoryItemsController.GetBatchOfInventoryItemsByStartingID/{0}/{1}", lastIDFetched, RECORDS_TO_FETCH);
???
类似的 ISTM 会更加直观。
更新 3
所以它归结为:为什么我的 GetAll() 方法被调用,当它不需要 args 时?
可能由于 lastIDFetched 设置为空字符串,路由机制变得混乱:
string lastIDFetched = string.Empty;
...然后格式化argready_uri。分配给这种方式:
formatargready_uri = string.Format("http://locohost:28642/api/InventoryItems/{0}/{1}", lastIDFetched, RECORDS_TO_FETCH);
...起初是:
"http://locohost:28642/api/InventoryItems//100"
(当我期望它是:
"http://locohost:28642/api/InventoryItems/""/100"
)
难道是“丢失”的第一个参数是什么让路由机制关闭,所以当它看到:
"http://locohost:28642/api/InventoryItems//100"
...它不知道是否调用这个:
public IEnumerable<InventoryItem> GetBatchOfInventoryItemsByStartingID(string ID, int CountToFetch)
{
return inventoryItemsRepository.Get(ID, CountToFetch); //.Where(i => string.Equals(p.Category, category,
StringComparison.OrdinalIgnoreCase)); }
...或这个:
public IEnumerable<InventoryItem> GetAllInventoryItems()
{
return inventoryItemsRepository.GetAll();
}
???
更新 4
当我注释掉另一个方法时,客户端别无选择,只能看到 Controller/Repository 中唯一存在的方法,它在这一行什么都不做:
var webRequest = (HttpWebRequest)WebRequest.Create(formatargready_uri);
(仍然没有调用Controller中的双参数方法)
这就是控制器中的所有内容:
public class InventoryItemsController : ApiController
{
static readonly IInventoryItemRepository inventoryItemsRepository = new InventoryItemRepository();
[Route("api/InventoryItems/{ID}/{CountToFetch:int}")] // <-- with this route decoration commented out or not, makes no difference
public IEnumerable<InventoryItem> GetBatchOfInventoryItemsByStartingID(string ID, int CountToFetch)
{
return inventoryItemsRepository.Get(ID, CountToFetch); //.Where(i => string.Equals(p.Category, category, StringComparison.OrdinalIgnoreCase));
}
}
下面是对应的Repository接口:
interface IInventoryItemRepository
{
IEnumerable<InventoryItem> Get(string ID, int CountToFetch);
InventoryItem Add(InventoryItem item);
}
...存储库实现:
public class InventoryItemRepository : IInventoryItemRepository
{
private readonly List<InventoryItem> inventoryItems = new List<InventoryItem>();
public InventoryItemRepository()
{
// code that populates inventoryItems by calling Add() not shown - it works, though
}
public IEnumerable<InventoryItem> Get(string ID, int CountToFetch)
{
return inventoryItems.Where(i => 0 < String.Compare(i.Id, ID)).Take(CountToFetch);
}
public InventoryItem Add(InventoryItem item)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
inventoryItems.Add(item);
return item;
}
}
...以及调用它的客户端代码:
formatargready_uri = string.Format("http://localhost:28642/api/InventoryItems/{0}/{1}", lastIDFetched, RECORDS_TO_FETCH);
var webRequest = (HttpWebRequest)WebRequest.Create(formatargready_uri);
更新 5
好吧,我会像一只破洞的袜子一样被诅咒。毕竟,从空字符串开始似乎是个问题。当我将 lastIDFetched 的初始值从 string.Empty 更改为“billy”时,它起作用了……这是一个错误吗?有解决方法吗?如果我想从“scratch”开始,我会使用什么而不是 string.Empty?空格 (" ") 也不起作用。