Question

我正在生成一个带有预选值的ListBox，如下所示。问题是当我选择其键字符串长度大于1的项目时，列表框选择错误的项目。情况就是这样，

public static System.Web.Mvc.MultiSelectList CreateListBox()
{
    List<KeyValuePair<string, string>> alanList = new List<KeyValuePair<string, string>>();
            alanList.Add(new KeyValuePair<string, string>("A", "A"));
            alanList.Add(new KeyValuePair<string, string>("B", "B"));
            alanList.Add(new KeyValuePair<string, string>("BC", "BC"));
            alanList.Add(new KeyValuePair<string, string>("C", "C"));
            alanList.Add(new KeyValuePair<string, string>("D", "D"));
            alanList.Add(new KeyValuePair<string, string>("BAYI", "BAYI"));

            List<string> vals = new List<string>();
            vals.Add("BAYI");
            vals.Add("BC");
            System.Web.Mvc.MultiSelectList ret = new System.Web.Mvc.MultiSelectList(alanList, "Key", "Value", vals);

            return ret ;
}

在结果中，选择值为A，B和C的HTML项目。未选择BAYI和BC。问题是什么？有什么想法吗？

Answer 1

以下作品对我很有用，我会向您推荐：

型号：

public class MyViewModel
{
    public IEnumerable<string> SelectedItemIds { get; set; }

    public IEnumerable<SelectListItem> Items 
    {
        get
        {
            return new[]
            {
                new SelectListItem { Value = "A", Text = "A" },
                new SelectListItem { Value = "B", Text = "B" },
                new SelectListItem { Value = "BC", Text = "BC" },
                new SelectListItem { Value = "C", Text = "C" },
                new SelectListItem { Value = "D", Text = "D" },
                new SelectListItem { Value = "BAYI", Text = "BAYI" },
            };
        }
    }
}

控制器：

public class HomeController : Controller
{
    public ActionResult Index()
    {
        var model = new MyViewModel
        {
            SelectedItemIds = new[] { "BAYI", "BC" }
        };
        return View(model);
    }
}

查看：

@model MyViewModel

@Html.ListBoxFor(
    x => x.SelectedItemIds, 
    new SelectList(Model.Items, "Value", "Text")
)

MVC3 Razor - ListBox预选不起作用

1 个答案: