ASP.NET MVC Multiselect ListBox没有选择多个值

Question

这是我的模特班

public class OperationStudyInputViewModel
{
   public IEnumerable<string> AttachmentId { get; set; }
}

这是我的控制器方法：

public ActionResult OperationStudyInput()
{
    var attachmentList = _dbContext.AttachmentAndFolders
        .Where(x => x.IsAttachementOrFolder == "Attachment")
        .Select(x => new 
        {
            x.AttchmentFolderId,
            x.Name
        }).ToList();
    ViewBag.AttachmentList = new MultiSelectList(attachmentList, "AttchmentFolderId", "Name");
}

这是View：

<div class="input-group input-group-lg col-md-6">
    @Html.LabelFor(model => model.AttachmentId, htmlAttributes: new { @class = "input-group-addon" })
    @Html.ListBoxFor(model => model.AttachmentId,(MultiSelectList)ViewBag.AttachmentList)
</div>

MultiSelet文本框可以正确呈现，但是它只选择一个值，而不选择多个值。

无法确定问题出在哪里！ 任何帮助请！

Answer 1

多选列表框要求您按住Ctrl才能选择多个项目。