Question

我试图通过ajax将模型中的对象列表从视图传递给控制器它返回空白列表并抛出此错误

$ exception {“ 对象引用未设置为的实例 object。“} System.NullReferenceException模型 muproject.ViewModel.StudentsVM .Students.get返回null。

控制器

[HttpPost]
        public ActionResult AddStudents(StudentsVM students) {

            return new JsonResult
            {
                // students.Students.Count this line causes the excption
                Data = "Successfull " + students.Students.Count
        };

        }

模型

        public class StudentsVM
        {
            public List<Student> Students { get; set; }
        //other fields    
        }

Student is model in Models

查看

    @model myproject.ViewModel.StudentsVM
        <form id="StuForm">              
                 <input type="button" value="+" id="insert" class="btn btn-primary">
                @for (int i= 0;i< Model.Students.Count;i++)
          {
                <input type="hidden" name="Student.Index" value="@i" />
         @Html.EditorFor(model => model.Students[i].studentName, new
        {
            htmlAttributes = new { @Name = "Students[" + j + "].studentName", @class = "form-control required student" }
        })

           @Html.EditorFor(model => model.Students[i].studentId, new
        {
            htmlAttributes = new { @Name = "Students[" + i + "].studentId", @class = "form-control required student" }
        })
        <input type="button" value="-" class="btn btn-danger removeStu" style="margin-left:10px;">
        }
         </form>
       @{
                int j = 0;
            }

的Ajax

       $("#StuForm").submit(function (event) {
            event.preventDefault();

            $.ajax({
                url: '@Url.Action("AddStudents", "Test")',
                type: 'POST',
                cache: false,
                data:$('#StuForm').serialize(),
                success: function (result) {
                 //   $("#response").text(result);
                    alert(result);
                }

            });
        });

和javascript代码添加和删除学生

通过ajax通过NullReferenceException

0 个答案: