如何阻止选择标记帮助程序自动添加“多个”属性 [英] How to stop select tag helper from automatically adding 'multiple' attribute

问题描述

我正在使用 .Net Core VS2017

，并尝试使用来自模型。为此，我将选择列表声明为

and trying to populate my dropdown with data from the model. For this purpose I declared my select list as

<select class="form-control" asp-for="TicketTypes" asp-items="@(new SelectList(Model.TicketTypes,"Id","Name"))"></select>

它可以正确加载数据，但会自动向其中添加multiple属性。如何停止此操作，因为我需要在下拉菜单中显示此操作

It is loading the data correctly but it automatically adds the multiple attribute to it. How to stop this because I need to show this in dropdown

推荐答案

因此，选择标签帮助程序将自动生成一个-选择是否在asp-for属性中指定的属性是IEnumerable。

So it turns out the select tag helper will automatically generate a multi-select if the property specified in the asp-for attribute is an IEnumerable.

public IEnumerable<Models.TicketTypeList> TicketTypes { get; set; }

所以我更改了代码并将数据存储在 ViewBag 作为 SelectList ，方法是将控制器中的代码更改为

So I changed the code and stored the data in ViewBag as SelectList by changing the code in controller to

var ticketTypes = _context
                .TicketType
                .Where(w => w.Deleted == false)
                .Select(s => new {
                                                    id = s.Id,
                                                    Name = s.Name
                    }).OrderBy(o=>o.Name).ToList();

ViewBag.ticketTypeList = new SelectList(ticketTypes, "id", "Name");

，然后在视图中将代码更改为

and then in the view changed the code to

@Html.DropDownList("TicketTypes",ViewBag.ticketTypeList as SelectList, new { @class = "form-control" })

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