Blazor 将多选绑定到一个值

Question

我正在尝试将多选绑定到一个值，然后将其传递给模型，但目前它只返回一个值，我尝试将其从字符串更改为字符串数组但出现很多错误并且无法找到解决办法。

有谁知道我如何返回用户选择的所有值？

谢谢！

<div class="form-group col-md-6">
   <label for="dur">Duration</label>
   <select @bind="Duration" class="custom-select" id="dur" multiple>
      <option value="12" selected>One Year</option>
      <option value="24">Two Year</option>
      <option value="36">Three Year</option>
      <option value="48">Four year</option>
      <option value="60">Five Year</option>
   </select>
   <small class="form-text text-muted">Hold <b>'CTRL'</b> to select multiple.</small>
</div>

@code {

 private string _Duration;

       private string Duration
        {
            get => _Duration;
            set
            {
                if (value != _Duration)
                {
                    _Duration = value;
                    UpdateModel();
                }
            }
        }
}

Answer 1

<select multiple >
@foreach (var item in myVar)
{
   <option value="@item.SlctValue" @onclick=@((e) => OptionClickEvent(@item.SlctValue,e))>@item.SlctName</option>
}
</select>

@foreach (var holderItem in myHolder)
{
   @holderItem
}



@code  {
   private List<string> myHolder = new List<string>();

   private List<SelectModel> myVar = new List<SelectModel>()
   {
      new SelectModel(){ SlctValue = 1, SlctName="One Year" },
      new SelectModel(){ SlctValue = 2, SlctName="Two Year" },
      new SelectModel(){ SlctValue = 3, SlctName="Three Year"},
      new SelectModel(){ SlctValue = 4, SlctName="Four Year" },
   };

   public void OptionClickEvent(int values,MouseEventArgs evnt)
   {
       if (evnt.CtrlKey)
       {
           myHolder.Add(values.ToString());
       }
   }

   public class SelectModel
   {
       public string SlctName { get; set; }
       public int SlctValue { get; set; }
   }

}