使用$選擇的OData查詢選項中的ASP.NET Web API 2服務

我想補充的OData查詢選項在現有的ASP.NET Web API服務2跟隨此link。我只希望查詢選項在GET方法中可用。當我試圖通過ID獲取項目時，我無法使用$ select選項。我怎樣才能做到這一點？這是我到目前爲止有：

public class OrdersController : ApiController 
{ 
    private readonly IOrderService orderService; 

    public OrdersController(IOrderService orderService) 
    { 
     this.orderService = orderService; 
    } 

    [HttpGet] 
    [Route("api/orders/{id}", Name = "GetOrderById")] 
    [ResponseType(typeof(Order))] 
    public IHttpActionResult GetOrder(ODataQueryOptions<Order> opts, [FromUri] int id) 
    { 
      Order order = orderService.GetOrderById(id); 
      if (order == null) 
      { 
       return NotFound(); 
      } 

      if (opts.SelectExpand != null) 
       Request.ODataProperties().SelectExpandClause = opts.SelectExpand.SelectExpandClause; 

      return Ok(order); 
    } 
}

當我測試它（？http://localhost:10240/api/orders/1 $選擇=的OrderId）我有以下結果：

{ 
    "OrderId": 1, 
    "ExternalId": "S001", 
    "TransactionType": "I", 
    "BusinessAssociateId": 1, 
    "DeliveryDate": "2017-06-30T21:08:50.427", 
    "Priority": 5, 
    "OrderType": "A", 
    "Status": "F", 
    "Information": "Incoming Material", 
    "Device": "1", 
    "BusinessAssociateName": null, 
    "BusinessAssociateStreet": null, 
    "BusinessAssociateCity": null, 
    "OrderDetails": null 
}

來源

2017-08-21 Wacho

嘗試改變[HTTPGET]至[EnableQuery]。您也可以嘗試自己應用這些選項，opts.SelectExpand.ApplyTo（order）; – mumfy

由於@mumfy建議，我錯過了應用選項。在GetOrder方法的最後一行留下：

返回OK（opts.ApplyTo（Enumerable.Repeat（順序1）.AsQueryable（）））;

來源

2017-09-11 22:49:29 Wacho

使用$選擇的OData查詢選項中的ASP.NET Web API 2服務

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