Question

我是这个ASP.net MVC的新手，并且真的陷入了ListBoxFor和DropDownListFor。

我该如何使用它们？任何例子？

Answer 1

真的不是那么难。与往常一样，您首先要定义一个视图模型：

Public Class MyViewModel
    Public Property SelectedItems As IEnumerable(Of String)
    Public Property SelectedItem As String
    Public Property Items As IEnumerable(Of SelectListItem)
End Class

然后是控制器：

Public Class HomeController
    Inherits System.Web.Mvc.Controller

    Function Index() As ActionResult
        Dim model = New MyViewModel With {
            .Items = {
                New SelectListItem() With {.Value = "1", .Text = "item 1"},
                New SelectListItem() With {.Value = "2", .Text = "item 2"},
                New SelectListItem() With {.Value = "3", .Text = "item 3"}
            }
        }
        Return View(model)
    End Function

    Function Index(model As MyViewModel) As ActionResult
        ' Here you can use the model.SelectedItem which will
        ' return you the id of the selected item from the DropDown and 
        ' model.SelectedItems which will return you the list of ids of
        ' the selected items in the ListBox.
        ...
    End Function
End Class

最后是一个相应的强类型视图：

@ModelType MvcApplication1.MyViewModel

@Using Html.BeginForm()
    @Html.DropDownListFor(Function(x) x.SelectedItem, Model.Items)
    @Html.ListBoxFor(Function(x) x.SelectedItems, Model.Items)
    @<input type="submit" value="OK" />
End Using

VB.NET - 使用ListBoxFor和DropDownList

1 个答案: