如何在不导致视图状态错误的情况下向数据绑定网格视图添加一行？
我正在尝试将行分组行添加到我的数据绑定网格视图中。它在第一次响应时工作正常，但在回发时我收到“无法加载视图状态”错误。
有 GridView 的 RowDataBound 事件的代码：
Private Sub AddGroupingRow(ByRef eRow As GridViewRow, ByVal Css As String, ByVal ColSpan As Integer, ByVal Txt As String)
Dim cell As New TableCell()
cell.ColumnSpan = ColSpan
cell.CssClass = "Spacing FieldCell"
cell.Text = Txt
Dim row As New GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Normal)
row.CssClass = Css
row.Cells.Add(cell)
Dim tbl As Table
tbl = eRow.Parent
tbl.Rows.AddAt(eRow.RowIndex + 1, row)
End Sub
Private Prev_Client_ID As Integer = -1
Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
If e.Row.RowType = DataControlRowType.DataRow Then
Dim dr As Data.DataRowView = TryCast(e.Row.DataItem, Data.DataRowView)
If dr IsNot Nothing AndAlso dr.Row.RowState <> Data.DataRowState.Added Then
Dim Client_ID As Integer = dr.Item("Client_ID")
If Client_ID <> Prev_Client_ID Then AddGroupingRow(e.Row, "Group", 8, dr.Item("Client_Name"))
Prev_Client_ID = Client_ID
End If
End If
End Sub
我知道在数据源中创建分组行更容易，但是从该代码派生，我想为站点上的其他网格创建一些基础。
I'm trying to add a row grouping row to my data-bound gridview. It works fine on the first response, but at the postback i got the "Failed to load viewstate" error.
There is the code for the GridView's RowDataBound event:
Private Sub AddGroupingRow(ByRef eRow As GridViewRow, ByVal Css As String, ByVal ColSpan As Integer, ByVal Txt As String)
Dim cell As New TableCell()
cell.ColumnSpan = ColSpan
cell.CssClass = "Spacing FieldCell"
cell.Text = Txt
Dim row As New GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Normal)
row.CssClass = Css
row.Cells.Add(cell)
Dim tbl As Table
tbl = eRow.Parent
tbl.Rows.AddAt(eRow.RowIndex + 1, row)
End Sub
Private Prev_Client_ID As Integer = -1
Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GridView1.RowDataBound
If e.Row.RowType = DataControlRowType.DataRow Then
Dim dr As Data.DataRowView = TryCast(e.Row.DataItem, Data.DataRowView)
If dr IsNot Nothing AndAlso dr.Row.RowState <> Data.DataRowState.Added Then
Dim Client_ID As Integer = dr.Item("Client_ID")
If Client_ID <> Prev_Client_ID Then AddGroupingRow(e.Row, "Group", 8, dr.Item("Client_Name"))
Prev_Client_ID = Client_ID
End If
End If
End Sub
I know that it's easier to create the grouping rows at the datasource, but deriving from this code, i want to create some base to other grids at the site.
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尝试 此链接。它应该对你有帮助。我也有同样的问题。解决这个问题的唯一方法是正确理解视图状态。
Try this link. it should help you. I too had the same problem. The only way to resolve is a proper understanding of viewstate.
经过一番思考，答案再简单不过了：禁用gridview的viewstate。
我在每次分页或排序时重新绑定数据源，因此对视图状态的需求是最小的，除了 PageSize 和 PageIndex 之外，我被迫手动跟踪。
这是一个相当大的权衡：像 PageSize 和 PageIndex 这样的东西必须在之后手动管理，因为它们的状态由 ViewState 保存。
因此，即使完全按照我的意图去做，我也决定采用一个简单的替代解决方案：
它仍然对列进行分组，但以另一种方式，并且更加排序友好。我可以使用行跨度并使单元格不可见，但它会更难保留。此外，当用户将鼠标移到线条上时，我需要绘制线条，而行跨度会阻碍很多。
After some thinking, the answer could not be simpler: disable the viewstate of the gridview.
I was re-binding the datasource at every paging or sorting, so the need for the viewstate was minimum, except for the PageSize and PageIndex, that i became forced to keep track manually.
This is a considerable trade-off: things like PageSize and PageIndex must be managed manually afterwards, since their state are keeped by the ViewState.
So, even doing exactly what i was meant to do, i've decided to adopt an simple alternative solution:
It still groups the column, but in another way, and is more sort friendly. I could use rowspans and turn cells invisible, but it would be harder to keep. Besides, I'll need to paint the line when the user moves the mouse over it, and a rowspan would hinder a lot.