Question

我有一个类clsAnswers的列表：

这是那个班级

<Serializable()> Public Class clsAnswer
Public Property Text As String
Public Property AnswerID As Integer
Public Property IsCorrect As Boolean
Public Sub New(Text As String, IsCorrect As Boolean, Id As Integer)
    Me.Text = Text
    Me.IsCorrect = IsCorrect
    Me.AnswerID = Id
End Sub

结束班

我将它绑定到Gridview。这工作正常，我在网格中看到了我的数据。

我遇到的问题是，当我点击网格中的编辑并输入新值并单击更新时，新值显然已丢失。

这可能是正确保存数据的问题。我不太了解它应该如何在网页中工作。

当代码到达GridView1_RowUpdating时，新值已丢失且旧值为空。

我假设我在做回传错了，这是我的页面加载：

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If Not IsPostBack Then

       Answers.Add(New clsAnswer("Answer 1", False, 1))
        Answers.Add(New clsAnswer("Answer 2", False, 2))
        Answers.Add(New clsAnswer("Answer 3", False, 3))
        Answers.Add(New clsAnswer("Answer 4", False, 4))

        ViewState("Grid") = Answers
        GridView1.DataSource = Answers
        GridView1.DataKeyNames = {"AnswerID"}
        GridView1.DataBind()
   Else
        Answers = ViewState("Grid")
        GridView1.DataSource = Answers
        GridView1.DataBind()
   End If

我已经尝试了所有我能想到的你能发现我做错了吗？

我已将页面加载修改为：

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If Not IsPostBack Then

        Answers.Add(New clsAnswer("Answer 1", False, 1))
        Answers.Add(New clsAnswer("Answer 2", False, 2))
        Answers.Add(New clsAnswer("Answer 3", False, 3))
        Answers.Add(New clsAnswer("Answer 4", False, 4))

        ViewState("Grid") = Answers
        GridView1.DataSource = Answers
        GridView1.DataKeyNames = {"AnswerID"}
        GridView1.DataBind()
    Else
        Answers = ViewState("Grid")
    End If

End Sub

我将GridView1_RowUpdating as：

    Private Sub GridView1_RowUpdating(sender As Object, e As GridViewUpdateEventArgs) Handles GridView1.RowUpdating

    Answers(e.RowIndex).Text = e.NewValues!Text.ToString
    Answers(e.RowIndex).IsCorrect = e.NewValues!IsCorrect
    ViewState("Grid") = Answers
    Answers = ViewState("Grid")
    GridView1.EditIndex = -1
    bindgrid()

End Sub

网格正确地保存数据，但我发现我必须点击“编辑”＃39;并且＆＃39;更新＆＃39;两次任何想法为什么

Answer 1

删除以下代码

Else
    Answers = ViewState("Grid")
    GridView1.DataSource = Answers
    GridView1.DataBind()

原因是您在PostBack上将原始数据重新绑定到GridView，因此您所做的所有更改都会被ViewState("Grid")

中的值覆盖

尝试将列表绑定到gridview更新更改将丢失

1 个答案: