如何綁定匿名類下拉值

Question

我想填充數值的下拉，帶C.The下面的代碼工作只有創造，而不是編輯。

ViewBag.UserType = new[] { new SelectListItem { Text = "A", Value = "1", Selected = false }, new SelectListItem { Text = "B", Value = "2", Selected = false }, new SelectListItem { Text = "C", Value = "3", Selected = false } }; 

所以我創建了一個匿名類。我有一個像下面這樣的匿名課程。

var Roles= new[] 
      { new { Id =1,UserType="A" }, 
       new {Id=2,UserType="B" }, 
       new {Id=3,UserType="B" }    
      }; 
      ViewBag.Type = Roles.ToList(); 

但我不知道如何在視圖中填充下拉菜單。

@Html.DropDownListFor(model => model.UserType, ((IEnumerable<SelectListItem>)ViewBag.UserType).Select(option => new SelectListItem 
            { 
             Text = (option == null ? "None" : option.Text), 
             Value = option.Value.ToString(), 
             Selected = (Model != null) && (option.Value == (Model.UserType).ToString()) 
            }),"Select") 

，我應該怎樣更改視圖

Answer 1

以下屬性添加到您的ViewModel類 -

public SelectList Roles 
    { 
     get 
     { 
      List<SelectListItem> items = new List<SelectListItem>(); 
      items.Add(new SelectListItem 
      { 
       Value = "1", 
       Text = "A", 
      }); 
      items.Add(new SelectListItem 
      { 
       Value = "2", 
       Text = "B", 
      }); 
      items.Add(new SelectListItem 
      { 
       Value = "3", 
       Text = "C", 
      }); 

      return new SelectList(items, "Value", "Text"); 
     } 
    } 

    public int SelectedRole { get; set; } 

，並綁定在查看如下 -

@Html.DropDownListFor(model => model.SelectedRole, Model.Roles)