razor - 剃刀选择框无法转换 lambda 表达式

Question

我需要将其转换<select id="degreemultiselect" multiple="multiple"></select为剃刀控件@Html.DropDownList，但我收到错误消息“无法将 lambda 表达式转换为类型字符串？” 是因为模型是一个列表public List<DegreeModel> selectedRequesterDegrees { get; set; }，有没有解决这个问题的方法？

@Html.DropDownList(x => x.selectedRequesterDegrees, new { id = "degreemultiselect", @class = "form-control" })
@Html.ValidationMessageFor(model => model.selectedRequesterDegrees)

标签： razorasp.net-core-mvcrazor-pages

Answer 1

这是一个工作演示：

模型：

public class Test
{
    public List<DegreeModel> selectedRequesterDegrees { get; set; }
}

看法：

@model Test
@Html.DropDownListFor(x => x.selectedRequesterDegrees, new SelectList(Model.selectedRequesterDegrees, "Id", "Name"), null, new { id = "degreemultiselect", @class = "form-control" })

控制器：

[HttpGet]
public ActionResult Index()
{
    var model = new Test()
    {
        selectedRequesterDegrees = new List<DegreeModel>()
        {
            new DegreeModel(){ Id=1,Name="aa"},
            new DegreeModel(){ Id=2,Name="bb"},
            new DegreeModel(){ Id=3,Name="cc"}
        }
    };
    return View(model);
}  

结果：