Asp.net Core MVC 6 - bootstrap modal bind bool？复选框

问：

我在布尔值在部分模态引导视图上保持其值时遇到了问题。

在模型中有一个布尔属性

        [Required]
        public bool? IsActive { get; set; }
          

在索引控制器中，我有几个正在生成的 Viewbag 列表。ViewBag.IsActive 将生成列表，但在加载部分视图时未选择正确的值。列表的其余部分正在工作，并且在单击编辑按钮时选择了正确的值。

   ViewBag.IsActive = new List<SelectListItem>
   {
       new SelectListItem {Text = "--Not Set--", Value = ""},
       new SelectListItem {Text = "True", Value=true.ToString()},
       new SelectListItem {Text = "False", Value=false.ToString()}
  };

  ViewBag.ExamType = new List<SelectListItem>
   {
   new SelectListItem{ Text="Credentialed", Value = "C" },
   new SelectListItem{ Text="Review", Value = "R" },
   new SelectListItem{ Text="Scantron", Value = "S" },
   new SelectListItem{ Text="Practice", Value = "P" }
   };

  ViewBag.ExamTime = new List<SelectListItem>
  {
              new SelectListItem{ Text="1 Hour", Value = "3600" },
              new SelectListItem{ Text="1.25 Hour", Value = "4500" },
              new SelectListItem{ Text="1.5 Hours", Value = "5400" },
              new SelectListItem{ Text="1.75 Hours", Value = "6300" },
              new SelectListItem{ Text="2 Hours", Value = "7200" },
              new SelectListItem{ Text="2.5 Hours", Value = "9000" },
              new SelectListItem{ Text="3 Hours", Value = "10800" },
              new SelectListItem{ Text="4.5 Hours", Value = "16200" },
              new SelectListItem{ Text="No Time Limit", Value = "0" }
  };

   ViewBag.CredentialId = new SelectList(db.Credentials.Where(x => x.IsActive == true || x.CredentialCode == "5YEAR").OrderBy(x => x.CredentialDesc), "CredentialId", "CredentialDesc");

   ViewBag.CredentialStatusId = new SelectList(db.CredentialStatuses.OrderBy(x => x.CredentialStatusDescription), "CredentialStatusId", "CredentialStatusDescription");

在“索引”视图中，有一个函数更新下面的值，我有 val.（data.IsActive） 用于 ddlActiveStatusOption，IsActive 用于测试尝试并返回值。

    function FunctionEdit(element) {
    var id = $(element).closest('tr').find('#hdncode').val();
    CreateNew();
    $.ajax({
        type: 'post',
        url: '@Url.Action("GetById", "Exams")/' + id,
        data: { code: id },
        async: false,
        success(data) {
            console.log("what is this",data)
            console.log("isActive", data.isActive)
            if (data != null) {
                $('#CredentialId').val(data.credentialId);
                $('#CredentialStatusId').val(data.credentialStatusId);
                $('#ExamTime').val(data.examTime);
                $('#ExamType').val(data.examType);
                $('#IsActive').val(data.isActive);
                $('#ddlActiveStatusOption').val(data.isActive)
            }
        },          
        error() {

        }
    });
}

console.logs 来自上面的代码块

The GetById

  public Exam GetById(int Id)
  {
      var exam = db.Exams.FirstOrDefault(x => x.ExamId == Id);
      return exam;
  }

然后调用局部视图

    <div class="form-group">
    <label asp-for="CredentialId" class="control-label"></label>
    <select asp-for="CredentialId" class="form-control" asp-items="ViewBag.CredentialId"></select>
    <span asp-validation-for="CredentialId" class="text-danger"></span>
    </div>

    <div class="form-group">
    <label asp-for="CredentialStatusId" class="control-label"></label>
    <select asp-for="CredentialStatusId" class="form-control" asp-items="ViewBag.CredentialStatusId"></select>
    <span asp-validation-for="CredentialStatusId" class="text-danger"></span>
    </div> 

    <div class="form-group">
    <label asp-for="ExamTime" class="control-label"></label>
    <select asp-for="ExamTime" class="form-control" asp-items="ViewBag.ExamTime"></select>
    <span asp-validation-for="ExamTime" class="text-danger"></span>
    </div>
   
    <div class="form-group">
    <label asp-for="ExamType" class="control-label"></label>
    <select asp-for="ExamType" class="form-control" asp-items="ViewBag.ExamType"></select>
    <span asp-validation-for="ExamType" class="text-danger"></span>
    </div>

   <div class="form-group">
   <label asp-for="IsActive" class="control-label"></label>
   <select asp-for="IsActive" class="form-control" asp-items="ViewBag.IsActive"></select>
   <span asp-validation-for="IsActive" class="text-danger"></span>

   <input id="ddlActiveStatusOption" class="form-control" /> 

如果我将 id 放在输入标记中，则可以获取 ddlActiveStatusOption 的 true 或 false 值，但是不会为 IsActive 保留任何值。我做错了什么？我已经阅读了以下链接的文档，并尝试了许多答案。

具有布尔值而不是字符串的 SelectListItem 复选框不适用于布尔值 viewmodel 属性