Question

我有以下表PurchaseQuery，供应商。但是，PurchaseQuery可以拥有多个供应商，因此添加了第三个表PurchaseQuerySupplier以保留两个表的ID。 enter image description here

我有PurchaseQuery表单，其中我添加了一个多选列表来选择多个供应商。

                            @Html.ListBoxFor(model => model.PurchaseQuerySuppliers, new MultiSelectList(Suppliers.AsEnumerable(), "ID", "Name"), new { @class = "chosen-select"})

但在我的Action Controller中，我获得了PurchaseQuerySuppliers的null对象。虽然我可以在FormCollection中逗号分隔Supplier值，但我想将PurchaseQuerySuppliers作为Action Controller中的PurchaseQuery内的对象。有什么想法吗？

Answer 1

您可以编写一个可以解决问题的视图模型。

public class PurchaseSupplierViewModel
{
    public List<int> SelectedSupplies { get; set; } 
    public List<SelectListItem> Suppliers { get; set; } 
}

和您的控制人员：

public ActionResult YourAction()
{
    List<Supplier> SupplierList = (get all Suppliers from DB here) 
    var model = new PurchaseSupplierViewModel()
    {
       Suppliers = SupplierList.Select(x => new SelectListItem
                        {
                            Value = x.ID.ToString(),
                            Text = x.Name,
                        }).ToList()
    };
    return View(model);
}

[HttpPost]
public ActionResult YourAction(PurchaseSupplierViewModel model)
{
    // model.SelectedSupplies will contain the selected Supplier IDs here
}

然后是观点：

@model PurchaseSupplierViewModel

@using (Html.BeginForm())
{
    @Html.ListBoxFor(x => x.SelectedSupplies, Model.Suppliers, new { @class = "chosen-select" })
    <input type="submit" value="Submit"/>
}

Answer 2

以下是我将如何使用一些测试示例：

型号：

    public class SuppliersModel
    {
        public List<Supplier> Suppliers { get; set; }
        public string[] PurchaseQuerySuppliers { get; set; }
    }

    public class Supplier
    {
        public int ID { get; set; }
        public string Name { get; set; }
    }

操作：

    public ActionResult ListTest()
    {
        var model = new SuppliersModel();
        model.Suppliers = new List<Supplier>();
        model.Suppliers.Add(new Supplier { ID = 1, Name = "Name1"});
        model.Suppliers.Add(new Supplier { ID = 2, Name = "Name2" });
        return View(model);
    }

    [HttpPost]
    public ActionResult ListTest(SuppliersModel model)
    {
        string[] selectedItems = model.PurchaseQuerySuppliers;

        return View(model);
    }

查看：

@model SuppliersModel
@using (Html.BeginForm())
{
@Html.ListBoxFor(model => model.PurchaseQuerySuppliers, new MultiSelectList(Model.Suppliers.AsEnumerable(), "ID", "Name"), new { @class = "chosen-select"})
<input type="submit" value="submit" />
}

在ASP.NET MVC中获取服务器端的多选值

2 个答案: