Question

您好我在index.cshtml页面中使用局部视图。部分视图包含一个从数据库动态绑定的下拉列表。

我不想使用viewbag或viewdata来绑定此下拉列表。

在控制器

中

    // GET: Reporting/Home
    public ActionResult Index()
    {
        var view = View();

        return view;
    }

    public ActionResult _ReportingMenu()
    {
        var DashboardList = GetAllDashboards();

        return View(DashboardList);
    }


    public IEnumerable<DashboardDefinition> GetAllDashboards()
    {
        return _reortDefinitionService.GetAllDashboards();
    }

在index.cshtml中

@model IEnumerable<Portal.Domain.ReportingModule.ReportDefinition.DashboardDefinition>

@{
    ViewBag.Title = "Reporting";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Reporting View</h2>
@Html.ActionLink("Add new Chart", "Create", "Chart", new { area = "Reporting" }, null)

@Html.Partial("_ReportingMenu")

在Partialview中

    @model  Portal.Domain.ReportingModule.ReportDefinition.DashboardDefinition

    <div class="nav navbar navbar-default navbar-no-margin submenu">

        @Html.DropDownList("Mobiledropdown1",IEnumerable<Model.DashboardName>)   

        <a id="SubMenuIntegratorNew" class="btn btn-default submenu-item" href="#">
            <i class="fa fa-file-o fa-lg"></i>
            <span class="submenu-item-text">New</span>
        </a>
        <a id="SubMenuIntegratorSave" class="btn btn-default submenu-item" href="#">
            <i class="fa fa-floppy-o fa-lg"></i>
            <span class="submenu-item-text">Save</span>
        </a>
        <a id="SubMenuIntegratorSaveAs" class="btn btn-default submenu-item" href="#">
            <i class="fa fa-files-o  fa-lg"></i>
            <span class="submenu-item-text">Save As</span>
        </a>
        <a id="SubMenuIntegratorAddChart" class="btn btn-default submenu-item" href="#">
            <i class="fa fa-picture-o fa-lg"></i>
            <span class="submenu-item-text">Add Chart</span>
        </a>
    </div>

但是我得到了null模型的错误。

我不知道如何在局部视图中实现

Answer 1

您应该使用视图模型，因此您可以同时包含列表和所选属性，例如：

public class DashboardViewModel
{
    public IEnumerable<SelectListItem> Data { get; set; }
    //Might not be an int, but just an example
    public int SelectedId { get; set; }
}

然后在控制器中填充它：

public ActionResult _ReportingMenu()
{
    var DashboardList = GetAllDashboards();

    var dropdownData = DashboardList
        .Select(d => new SelectListItem
        {
            Text = d.Name, //Need to apply the correct text field here
            Value = d.Id.ToString() //Need to apply the correct value field here
        })
        .ToList();

    var model = new DashboardViewModel
    {
       Data = dropdownData 
    };

    return View(model);
}

然后在您的两个视图中，设置模型：

 @model DashboardViewModel

然后在你的部分你可以做：

 @Html.DropDownListFor(m => m.SelectedId, Model.Data)

如何使用模型在mvc 4中部分视图中绑定下拉列表？

1 个答案: