MVC和实体框架选择列表

Question

我有一个MVC应用程序,我试图放在一起,需要一些选择列表和下拉列表.

所以,我有以下型号....

public class Task
{
    public int ID { get; set; }
    public string Title { get; set; }
    ......
    public virtual ICollection<Monitor> Monitors { get; set; }
    public virtual ICollection<Resource> Resources { get; set; }

}
public class Monitor
{
    public int ID { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }

    public IList<Task> Tasks { get; set; }
}
    public class Resource
{
    public int ID { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    .....

    public IList<Task> Tasks { get; set; }

有趣的是,当我显示一个任务列表时,在显示正常的其他属性中,我需要显示一个"监视器"列表和一个"资源"列表,这些列表分配给显示的索引视图中的任务下面.

@model IEnumerable<ResourceManager.Models.Task>

@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>

<p>
    @Html.ActionLink("Create New", "Create")
</p>
<table>
    <tr>
        .....
        <th>
            @Html.DisplayNameFor(model => model.Title)
        </th>
        .....
        <th>
            @Html.DisplayNameFor(model => model.Monitors)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Resources)
        </th>
        <th></th>
    </tr>

@foreach (var item in Model) {
    <tr>
        .....
        <td>
            @Html.DisplayFor(modelItem => item.Title)
        </td>
        .....
        <td>
            @if (item.Monitors == null || item.Monitors.Count == 0) 
                 {<span>No Monitors Assigned</span>}
            else 
                 { string.Join(", ", item.Monitors.Select(m => string.Format("{0} {1}", m.FirstName, m.LastName))); }
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Resources)
        </td>
        <td>
            @Html.ActionLink("Edit", "Edit", new { id=item.ID }) |
            @Html.ActionLink("Details", "Details", new { id=item.ID }) |
            @Html.ActionLink("Delete", "Delete", new { id=item.ID })
        </td>
    </tr>
}
</table>

这是控制器......

    public ActionResult Index()
    {
        var tasks = from t in db.Tasks where t.IsActive == true select t;
        return View(tasks);
    }

我希望监视器列表和资源列表在索引,删除和详细信息视图中显示为字符串,即"监视器1,监视器2,监视器3"和"资源1,资源2,资源3".

但是在其他视图(创建和编辑)上,我希望它们显示为可选列表.

Answer 1

首先在控制器中创建选择列表,

   var monitors = //Your linq query

    ViewData["ddlList"] = monitors .Select(x => new SelectListItem {
       Text = x.FirstName, 
       Value = x.Id.ToString() 
    }).ToList();

然后你可以在你的视图中使用它,如下所示,

<%=Html.DropDownList("myList") %>