綁定下拉列表值

Question

在整個我的應用程序中使用了這些，但碰到這個問題。

我有這兩種模式：

public class vwLkUpDepartmentCategory 
{ 
    [Key] 
    public int DepartmentCategoryID { get; set; } 
    public string DepartmentCategory { get; set; } 
    public Byte IsActive { get; set; } 
} 


public class vwDimDepartments 
{ 
    [Key] 
    public Int64 DepartmentID { get; set; } 
    public string DepartmentName { get; set; } 
    public int DepartmentCategoryID { get; set; } 
    public string DepartmentCategory{ get; set; } 
    public string Departments { get; set; } 
    public Byte IsActive { get; set; } 
} 

控制器

我設置的下拉列表的值在viewbag

ViewBag.DepartmentDropDown = new SelectList(db.vwLkUpDepartmentCategory.Where(x => x.IsActive == 1).ToList(), "DepartmentCategoryID", "DepartmentCategory"); 

在視圖中我有

<div>@Html.LabelFor(model => model.DepartmentCategoryID)</div> 
        <div>@Html.DropDownListFor(model => model.DepartmentCategoryID, new SelectList(ViewBag.DepartmentDropDown, "DepartmentCategoryID", "DepartmentCategory"), "", new { @class = "dropdown", id = "txtDepartmentCategoryID" })</div> 
        <div>@Html.ValidationMessageFor(model => model.DepartmentCategoryID, "", new { @class = "text-danger" })</div> 

但當我運行它時，我得到一個錯誤，說

DataBinding: 'System.Web.Mvc.SelectListItem' does not contain a property with the name 'DepartmentCategoryID'. 

這是因爲我有departmentId作爲視圖中的關鍵值？

如果我沒有在視圖中明確定義departmentCategoryID字段，那麼它需要第一個部門並始終使用該部門。

這是最好的方法是什麼？

Answer 1

試試這個控制器上::

ViewBag.DepartmentCategoryID= new SelectList(db.vwLkUpDepartmentCategory.Where(x => x.IsActive == 1).ToList(), "DepartmentCategoryID", "DepartmentCategory"); 

上查看::

<div>@Html.LabelFor(model => model.DepartmentCategoryID)</div> 
         <div>@Html.DropDownListFor(model => model.DepartmentCategoryID, SelectList(ViewBag.DepartmentCategoryID, new { @class = "dropdown", id = "txtDepartmentCategoryID" })</div> 
         <div>@Html.ValidationMessageFor(model => model.DepartmentCategoryID, "", new { @class = "text-danger" })</div>