我有一个下拉列表（客户）和复选框列表（销售订单），具体取决于当前选择的客户。如果我选择一个新客户，我希望复选框会清除，但它们会从一个到另一个维护，尽管模型在回发中被清除。
我不是经验丰富的 MVC 开发人员，但我不确定为什么会这样。在调试我发送回视图的 ViewModel 时，它显示所有复选框的 IsSelected = false，但在视图中，它们被选中。我究竟做错了什么？（提前致谢）
查看型号：
namespace MvcTest1.Models
{
public class Customer
{
public int CustomerID { get; set; }
public string Name { get; set; }
}
public class SalesOrder
{
public int SalesOrderID { get; set; }
public string Reference { get; set; }
public bool IsSelected { get; set; }
}
public class SalesOrderPageViewModel
{
public List<Customer> Customers { get; set; }
public int SelectedCustomerID { get; set; }
public List<SalesOrder> SalesOrders { get; set; }
}
}
控制器：
namespace MvcTest1.Controllers
{
public class SalesOrderPageController : Controller
{
[HttpGet]
public ActionResult Index()
{
SalesOrderPageViewModel viewModel = BuildViewModel(1);
return View(viewModel);
}
[HttpPost]
public ActionResult Index(SalesOrderPageViewModel viewModelInput)
{
SalesOrderPageViewModel viewModel = BuildViewModel(viewModelInput.SelectedCustomerID);
return View(viewModel);
}
public SalesOrderPageViewModel BuildViewModel(int customerID)
{
SalesOrderPageViewModel viewModel = new SalesOrderPageViewModel
{
Customers = new List<Customer>
{
new Customer { CustomerID = 1, Name = "Alan" },
new Customer { CustomerID = 2, Name = "Bob" },
new Customer { CustomerID = 3, Name = "Charlie" }
}
};
viewModel.SelectedCustomerID = customerID;
if (customerID == 1)
{
viewModel.SalesOrders = new List<SalesOrder>
{
new SalesOrder { SalesOrderID = 11, Reference = "AA11" },
new SalesOrder { SalesOrderID = 12, Reference = "AA22" },
new SalesOrder { SalesOrderID = 13, Reference = "AA33" }
};
}
if (customerID == 2)
{
viewModel.SalesOrders = new List<SalesOrder>
{
new SalesOrder { SalesOrderID = 21, Reference = "BB11" },
new SalesOrder { SalesOrderID = 22, Reference = "BB22" },
new SalesOrder { SalesOrderID = 23, Reference = "BB33" }
};
}
if (customerID == 3)
{
viewModel.SalesOrders = new List<SalesOrder>
{
new SalesOrder { SalesOrderID = 31, Reference = "CC11" },
new SalesOrder { SalesOrderID = 32, Reference = "CC22" },
new SalesOrder { SalesOrderID = 33, Reference = "CC33" }
};
}
return viewModel;
}
}
}
看法：
@model MvcTest1.Models.SalesOrderPageViewModel
@{
ViewBag.Title = "SalesOrderPage";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>SalesOrderPage</h2>
<br /><br />
@using (Html.BeginForm())
{
@Html.DropDownListFor(model =>
model.SelectedCustomerID,
new SelectList(
Model.Customers,
"CustomerID",
"Name",
Model.SelectedCustomerID
),
new { id = "customerSelect" }
);
<script type="text/javascript">
$(function () {
$('#customerSelect').change(function () {
this.form.submit();
});
})
</script>
<br /><br />
for (int i = 0; i < Model.SalesOrders.Count(); i++)
{
@Html.DisplayFor(m => Model.SalesOrders[i].Reference)
@Html.CheckBoxFor(m =>
m.SalesOrders[i].IsSelected
)
<br />
}
}