ViewBag在另一个动作中为null

debugcn 发表于 Dev

吉拉泽

我有以下代码：

public PartialViewResult studentsDiv(int? id)
        {
            if (id == null)
            {
                id = ViewBag.studentId;
            }
            else
            {
                ViewBag.studentId = id;
            }

            ACD_UNI_STUDENTS students = db.ACD_UNI_STUDENTS.Find(id);

            return PartialView(students);
        }

        public PartialViewResult personalStudentDetails()
        {
            int? id = int.Parse(ViewBag.studentId);
            ACD_UNI_STUDENTS students = db.ACD_UNI_STUDENTS.Find(id);

            return PartialView(students);
        }

但它抛出异常，int? id = int.Parse(ViewBag.studentId);表示我的viewbag为null。但这实际上不是null，因为在我的studentsDiv动作中它还是第一次出现。当我调试id时，例如1，但在我的personalStudentDetails上，此ViewBag始终为null

这是我的看法：

@Ajax.ActionLink("Full details", "studentsDiv", new
        {

        }, new AjaxOptions()
        {
            HttpMethod = "GET",
            UpdateTargetId = "studentsDiv",
            InsertionMode = InsertionMode.Replace
        }, new { @class = "sactive", id = Model.ID })
|
@Ajax.ActionLink("Partial details", "personalStudentDetails", new
        {

        }, new AjaxOptions()
        {
            HttpMethod = "GET",
            UpdateTargetId = "studentsDiv",
            InsertionMode = InsertionMode.Replace
        }, new { @class = "sactive", id = Model.ID })

用户名

更改您的ActionLink（）方法，以将idroute参数作为路由参数传递给您的方法（用于的同上personalStudentDetails）

@Ajax.ActionLink("Full details", "studentsDiv", 
    new { id = Model.ID }, 
    new AjaxOptions()
    {
        HttpMethod = "GET",
        UpdateTargetId = "studentsDiv",
        InsertionMode = InsertionMode.Replace
    },
    new { @class = "sactive" }) // assume you don't really need an id attribute

然后方法就可以了（假设ID属性不可为空）

public PartialViewResult studentsDiv(int id)
{
    ACD_UNI_STUDENTS students = db.ACD_UNI_STUDENTS.Find(id);
    return PartialView(students);
}

 public PartialViewResult personalStudentDetails(int id)
{
    ACD_UNI_STUDENTS students = db.ACD_UNI_STUDENTS.Find(id);
    return PartialView(students);
}

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