如何使用元組MVC 5

Question

我想使用的元組，所以我可以在同一個視圖中使用2種型號，我在我的控制器這樣做：

public ActionResult Index(int id = 0) 
{ 
    int lastVoyageID = entities.log_voyage.Max(item => item.Num_Voy); 

    var first = entities.log_voyage.Where(v => v.Num_Voy == lastVoyageID); 
    log_voyage voyage1 = entities.log_voyage.Find(lastVoyageID); 
    var second = entities.log_ligne_voyage.Where(x => x.NUM_Voy == lastVoyageID).ToList(); 
    var t = new Tuple<log_voyage, log_ligne_voyage>(first, second); 
    return View(t); 
}  

，但我得到這個：

我不知道該怎麼辦？我如何使用元組？

這是錯誤：

無法轉換成system.Linq.IQueryable WebApplication.Models.log_voyage

Answer 1

var first = entities.log_voyage.Where(v => v.Num_Voy == lastVoyageID)回報集合，但元組預計單個對象，因此它應該是;

var first = entities.log_voyage.Where(v => v.Num_Voy == lastVoyageID).FirstOrDefault()

而這個表達式返回收集和元組再次

var second = entities.log_ligne_voyage.Where(x => x.NUM_Voy == lastVoyageID).ToList()

您可能要更改元組簽名Tuple<log_voyage, List<log_ligne_voyage>>

最後尋求的只是一個對象，

public ActionResult Index(int id = 0) 
{ 

    int lastVoyageID = entities.log_voyage.Max(item => item.Num_Voy); 

    var first = entities.log_voyage.Where(v => v.Num_Voy == lastVoyageID).FirstOrDefault(); 
    log_voyage voyage1 = entities.log_voyage.Find(lastVoyageID); 
    var second = entities.log_ligne_voyage.Where(x => x.NUM_Voy == lastVoyageID).ToList(); 
    var t = new Tuple<log_voyage, List<log_ligne_voyage>>(first, second); 
    return View(t); 

}