我有一个带有按钮的 asp.net 页面，该按钮向 gridview 添加额外的行以输入数据库。网格视图由 3 个文本框（模板字段）组成，当我添加一行时，已经输入的信息会以某种方式在回发中消失。我希望按钮添加其他行而不消除其他行中的数据，直到我点击提交按钮。这是我的代码
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