ActionResult不被調用

Question

我有一個視圖，我在調用ActionResult方法，但在方法中放置一個斷點告訴我它沒有被調用。

<div> 
<ul class="list-group"> 
    @foreach (var item in Model) 
    { 
     <li class="list-group-item"> 
      <h4>Slide ID: @item.SlideId</h4> 
      <p><i>Received: @item.TimeStamp</i></p> 
      <div class="row"> 
       <div class="col-md-4"> 
        <h4>@Html.ActionLink("View details", "Well", new {slideid = item.SlideId})</h4> 
        <img src="@Url.Action("Index", "Images", new {id = item.SlideId})"/> //This is where I want to call the method      
       </div> 
      </div> 
     </li> 
    } 
</ul> 

而這裏的方法：

public class ImagesController : Controller 
{ 
    // GET: Images 
    public ActionResult Index(string id) 
    { 
     byte[] imageData = new byte[0]; 
     string cs = "Data Source=" + "some path"; 

     using (SQLiteConnection con = new SQLiteConnection(cs)) 
     { 
      string stm = "SELECT LastImage FROM Well WHERE SlideId = " + "'" + id + "'"; 
      con.Open(); 

      using (SQLiteCommand cmd = new SQLiteCommand(stm, con)) 
      { 
       using (SQLiteDataReader rdr = cmd.ExecuteReader()) 
       { 
        while (rdr.Read()) 
        { 
         imageData = Serialize(rdr["LastImage"]); 
        } 

        rdr.Close(); 

       } 
      } 

      con.Close(); 
     } 
     return File(imageData, "image/png"); 
    } 

    public static byte[] Serialize(object obj) 
    { 
     var binaryFormatter = new BinaryFormatter(); 
     var ms = new MemoryStream(); 
     binaryFormatter.Serialize(ms, obj); 
     return ms.ToArray(); 
    } 
} 

我試圖實現與這個代碼是從數據庫中的圖像加載到該視圖。任何暗示我做錯了什麼？

與RouteConfig

現在：

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

當你寫<img src="@Url.Action("Index", "Images", new {id = item.SlideId})"/>你不打電話的動作，但路線網址。結果是一個字符串，例如localhost:8080/images/index/abcd123456因此，如果要調用該操作，則需要使用@Html.Action("Index", "Images", new {id = item.SlideId})。注意@Html.Action而不是@Url.Action

Answer 2

我認爲，而不是打開和關閉每個圖像的數據庫連接，更好的方法是收集所有信息來呈現該頁面並將其發送到您張貼的視圖模型中。說它叫做HomeController的索引動作。它看起來就像是這樣的：

public class HomeController : Controller 
{ 
    public ActionResult Index(string id) 
    { 
     var listOfItems = new List<SomeClass>(); 

     string cs = "Data Source=" + "some path"; 
     using (SQLiteConnection con = new SQLiteConnection(cs)) 
     { 
      string stm = "SELECT SlideId, TimeStamp, LastImage FROM Well"; 
      con.Open(); 

      using (SQLiteCommand cmd = new SQLiteCommand(stm, con)) 
      { 
       using (SQLiteDataReader rdr = cmd.ExecuteReader()) 
       { 
        while (rdr.Read()) 
        { 
         var someItem = new SomeClass() 
         { 
          SlideId = rdr["SlideId"], 
          ImageData = Serialize(rdr["LastImage"]), 
          TimeStamp = rdr["TimeStamp"] 
         }; 
         listOfItems.Add(someItem); 
        } 

        rdr.Close(); 
       } 
      } 

      con.Close(); 
     } 

     return View(listOfItems); 
    } 
} 

當然，如果有太多的項目，你應該總是考慮分頁和限制列表中的項目的數量，以減少響應時間。