无法加载视图状态 [英] Failed to load view State
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问题描述
您好!
我正在尝试更新gridview的行。当我点击编辑按钮时没有任何反应。当我再次点击它时,它会显示我的错误。
Hello!
I am trying to update the row of a gridview . When i click on edit button nothing happens. when i again click on it , it shows me this error.
Failed to load viewstate. The control tree into which viewstate is being loaded must match the control tree that was used to save viewstate during the previous request. For example, when adding controls dynamically, the controls added during a post-back must match the type and position of the controls added during the initial request.
在我的网页上我正在调用此函数
on my pageload i am calling this function
Public Sub BindGrid()
Dim cd As String = Session("usercd")
Dim x As String = "select e.index_no , e.ref_no ,n.nature_detail as natureD,e.[subject] , e.outside_details,e.outside_copy_details from let_entry e "
x += "inner join nature as n on n.nature_cd=nature_code "
x += "where index_no like '%-D-%'"
x += " and org_usr_code='" + cd + "'"
x += "and let_no not in (select let_no from dispatch_det) order by 1 desc"
Dim dt As New DataTable()
dt = Dal.GettDS(x).Tables(0)
GridView3.DataSource = dt
GridView3.DataBind()
这些是活动
these are the events
Protected Sub GridView3_RowEditing(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewEditEventArgs) Handles GridView3.RowEditing
GridView3.EditIndex = e.NewEditIndex
End Sub
Protected Sub GridView3_RowCancelingEdit(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCancelEditEventArgs) Handles GridView3.RowCancelingEdit
e.Cancel = True
GridView3.EditIndex = -1
End Sub
Protected Sub GridView3_RowUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewUpdateEventArgs) Handles GridView3.RowUpdating
Dim gvrow As GridViewRow = GridView3.Rows(e.RowIndex)
Dim NatureCode As DropDownList = DirectCast(gvrow.FindControl("ddlNature"), DropDownList)
Dim txtReferenceNo As TextBox = DirectCast(gvrow.FindControl("txtRefNo"), TextBox)
Dim txtSubject As TextBox = DirectCast(gvrow.FindControl("txtSubject"), TextBox)
Dim txtOutsideDetails As TextBox = DirectCast(gvrow.FindControl("txtOutsideDetails"), TextBox)
Dim txtOutsideCopyDetail As TextBox = DirectCast(gvrow.FindControl("txtOutsideCopyDetails"), TextBox)
Dim lblDisNo As Label = DirectCast(gvrow.FindControl("lblDisNo"), Label)
Dim DisNo As String = lblDisNo.Text
Dim Ncode As Int32 = NatureCode.SelectedValue
Dim RefNo As String = txtReferenceNo.Text
Dim Subj As String = txtSubject.Text
Dim OutsideDetails As String = txtOutsideDetails.Text
Dim OutsideCopyDetails As String = txtOutsideCopyDetail.Text
Dim constring As String = ConfigurationManager.ConnectionStrings("patravaliConnectionString").ConnectionString
Dim con As New SqlConnection(constring)
Dim trns As SqlTransaction
con.Open()
trns = con.BeginTransaction()
Dim x As String
x = UpdateDetails(DisNo, RefNo, Ncode, Subj, OutsideDetails, OutsideCopyDetails, trns)
Try
If Val(x) > 0 Then
trns.Commit()
Else
trns.Rollback()
End If
Catch ex As Exception
Finally
con.Close()
BindGrid()
End Try
End Sub
Public Function UpdateDetails(ByVal Disno As String, ByVal RefrenceNo As String, ByVal Naturecode As Int32, ByVal Subject As String, ByVal OutsideDetails As String, ByVal OutsideCopyDetails As String, ByVal trns As SqlTransaction) As String
Dim update As String = "update let_entry set ref_no=@ref_no ,nature_code=@nature_cd, [subject]=@subject , outside_details=@outside_details, outside_copy_details=@outside_copy_details where index_no =@index_no"
Dim cmd As New SqlCommand(update, trns.Connection)
cmd.Transaction = trns
cmd.Parameters.AddWithValue("@ref_no", RefrenceNo)
cmd.Parameters.AddWithValue("@index_no", Disno)
cmd.Parameters.AddWithValue("@nature_cd", Naturecode)
cmd.Parameters.AddWithValue("@subject", Subject)
cmd.Parameters.AddWithValue("@outside_details", OutsideDetails)
cmd.Parameters.AddWithValue("@outside_copy_details", OutsideCopyDetails)
UpdateDetails = cmd.ExecuteNonQuery().ToString()
End Function
推荐答案
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读取评论作者:PhilM99。
Go through this whole discussion and see what you learn: http://forums.asp.net/t/940975.aspx/4/10[^]
Do read comment by PhilM99.
您应该向更新事件添加代码以检查事件中的行是否为itemtemplate或edittemplate。
ddlNature控件位于编辑模板内部,因此您需要首先检查它是否会解析。
You should add code to the update event to check if the row in event arg e is itemtemplate or edittemplate.
The ddlNature control is inside edit template so you need to check that first then it will resolve.
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