Asp.net 文本框值在回发时消失

我有一个asp.net页面，页面上有一个按钮，可以在gridview中添加一行，以便输入数据库。gridview由3个文本框（模板字段）组成，当我添加一行时，已经输入的信息会在回发中消失。我希望按钮可以添加额外的行，而不必取消其他行中的数据拼写，直到我点击submit按钮。这是我的密码

Private Sub AddNewRowToGrid()
    Dim rowIndex As Integer = 0
    If ViewState("CurrentTable") IsNot Nothing Then
        Dim dtCurrentTable As DataTable = DirectCast(ViewState("CurrentTable"), DataTable)
        Dim drCurrentRow As DataRow = Nothing
        If dtCurrentTable.Rows.Count > 0 Then
            For i As Integer = 1 To dtCurrentTable.Rows.Count
                'extract the TextBox values
                Dim box1 As TextBox = DirectCast(gvOLIAdj.Rows(rowIndex).Cells(1).FindControl("txtAdjAppr"), TextBox)
                Dim box2 As TextBox = DirectCast(gvOLIAdj.Rows(rowIndex).Cells(2).FindControl("txtAdjAmt"), TextBox)
                Dim box3 As TextBox = DirectCast(gvOLIAdj.Rows(rowIndex).Cells(3).FindControl("txtCmmts"), TextBox)
                drCurrentRow = dtCurrentTable.NewRow()
                drCurrentRow("Approval Date") = box1.ToString
                dtCurrentTable.Rows(i - 1)("Total Amount") = box2.ToString
                dtCurrentTable.Rows(i - 1)("Comments") = box3.ToString
                'dtCurrentTable.Rows(i - 1)("Initials") = 
                rowIndex += 1
            Next
            dtCurrentTable.Rows.Add(drCurrentRow)
            ViewState("CurrentTable") = dtCurrentTable
            gvOLIAdj.DataSource = dtCurrentTable
            gvOLIAdj.DataBind()
        End If
    Else
        Response.Write("ViewState is null")
    End If
    'Set Previous Data on Postbacks
    'SetPreviousData()
End Sub

Private Sub SetPreviousData()
    Dim rowIndex As Integer = 0
    If ViewState("CurrentTable") IsNot Nothing Then
        Dim dats As DataTable = DirectCast(ViewState("CurrentTable"), DataTable)
        If dats.Rows.Count > 0 Then
            For i As Integer = 0 To dats.Rows.Count - 1
                Dim box1 As TextBox = DirectCast(gvOLIAdj.Rows(rowIndex).Cells(1).FindControl("txtAdjAppr"), TextBox)
                Dim box2 As TextBox = DirectCast(gvOLIAdj.Rows(rowIndex).Cells(2).FindControl("txtAdjAmt"), TextBox)
                Dim box3 As TextBox = DirectCast(gvOLIAdj.Rows(rowIndex).Cells(3).FindControl("txtCmmts"), TextBox)
                box1.Text = dats.Rows(i)("Approval Date").ToString()
                box2.Text = dats.Rows(i)("Total Amount").ToString()
                box3.Text = dats.Rows(i)("Comments").ToString()
                rowIndex += 1
            Next
        End If
    End If
End Sub

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我能想到这可能发生的两个原因：

动态创建控件时，很难 回发后检索代码中的值

控件在原始HTML中设置了只读属性

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您可能想尝试传统的方法，如Request.Form

您是否有页面加载功能？我猜想，这将帮助你得到答案。是的，页面加载是存在的，但与此无关，它们之间没有任何连接。页面加载可以在回发时发挥作用。你能详细说明吗？你有解决办法吗？当我调试时，它甚至没有达到页面加载，所以我不知道你的意思是什么，当你刷新页面时，每次都会触发页面加载事件。