c# - MVC - 从 ListBoxFor 获取 ViewModel 对象

Question

我在提交表单后尝试获取自己的 View 模型，但出现以下错误:“无法将类型为‘System.String[]’的对象转换为类型‘System.String’”

这是我的代码:

View 模式:

public class SoftwarePackages
{
 public string[] PermissionsList { get; set; }
}

aspx

<%: Html.ListBoxFor(model => model.PermissionsList, new List<SelectListItem>(), new { size = 10 })%>

控制者

[HttpPost]
public ActionResult Index(SoftwarePackages softwarePackages)
{
  code...code...code
}

问题是什么？

谢谢

祖多尔

Answer 1

以下对我来说效果很好:

型号:

public class SoftwarePackages
{
    public string[] PermissionsList { get; set; }
    public IEnumerable<SelectListItem> Items { get; set; }
}

Controller :

public class HomeController : Controller
{
    public ActionResult Index()
    {
        var model = new SoftwarePackages
        {
            Items = new SelectList(new[]
            {
                new SelectListItem { Value = "1", Text = "item 1" },
                new SelectListItem { Value = "2", Text = "item 2" },
                new SelectListItem { Value = "3", Text = "item 3" },
            }, "Value", "Text")
        };
        return View(model);
    }

    [HttpPost]
    public ActionResult Index(SoftwarePackages softwarePackages)
    {
        // do something with softwarePackages.PermissionsList
        ...
    }
}

查看:

<% using (Html.BeginForm()) { %>
    <%: Html.ListBoxFor(model => model.PermissionsList, Model.Items, new { size = 10 })%>
    <input type="submit" value="OK" />
<% } %>