Question

我在asp.net.i中使用了Gridview_PageIndexChanging事件，使用了这样的代码：

gridFileDetails.PageIndex = e.NewPageIndex

在单击下一页的运行时间内，它会生成错误：

类型的例外   发生'System.InvalidCastException'   在FFK.DLL中但未在用户中处理   代码

其他信息：无法投射   对象类型   'System.Web.UI.WebControls.ContentPlaceHolder'   输入   'System.Web.UI.WebControls.GridViewRow'。

在RowCommand事件中

，

我使用了以下RowCommand事件：

Protected Sub gridFileDetails_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles gridFileDetails.RowCommand

    Dim row As GridViewRow = CType(CType(e.CommandSource, Control).NamingContainer, GridViewRow)
    Dim rowkey As DataKey = Me.gridFileDetails.DataKeys(row.DataItemIndex)
    Dim key As String = rowkey(0).ToString()
    If e.CommandName = "FileStatus" And e.CommandArgument <= 0 Then
        Response.Redirect("FFKFile.aspx?FileId=" + key)
    ElseIf e.CommandName = "TradexStatus" And e.CommandArgument <= 0 Then
        Response.Redirect("TradeX.aspx?FileId=" + key)
    ElseIf e.CommandName = "BondStatus" And e.CommandArgument <= 0 Then
        Response.Redirect("BondMaster.aspx?FileId=" + key)
    ElseIf e.CommandName = "FDStatus" And e.CommandArgument <= 0 Then
        Response.Redirect("FrmFileDocument.aspx?FileId=" + key)
    ElseIf e.CommandName = "InvoiceStatus" And e.CommandArgument <= 0 Then
        Response.Redirect("InvoiceMaster.aspx?FileId=" + key)
    ElseIf e.CommandName = "PDStatus" And e.CommandArgument <= 0 Then
        Response.Redirect("PackagingDetails.aspx?FileId=" + key)
    End If
End Sub

你可以解决这个问题吗？我在RowCommand事件的第一行收到错误，即。，

Dim row As GridViewRow = CType(CType(e.CommandSource, Control).NamingContainer, GridViewRow)

在PageIndexChanging事件中，我写了如下：

受保护的子gridFileDetails_PageIndexChanging（ByVal sender As Object，ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs）处理gridFileDetails.PageIndexChanging gridFileDetails.PageIndex = e.NewPageIndex 结束子

Answer 1

而不是：

Dim row As GridViewRow = CType(CType(e.CommandSource, Control).NamingContainer, GridViewRow)

使用EventArgs中的索引以编程方式抓取行：

Dim index As Integer = Convert.ToInt32(e.CommandArgument)
Dim row As GridViewRow = gridFileDetails.Rows(index)

Answer 2

引用System.Web.UI.WebControls.GridViewCommandEventArgs类的MSDN，提取gridviewrow的示例如下：

  ' Convert the row index stored in the CommandArgument
  ' property to an Integer.
  Dim index As Integer = Convert.ToInt32(e.CommandArgument)

  ' Retrieve the row that contains the button clicked 
  ' by the user from the Rows collection.
  Dim row As GridViewRow = ContactsGridView.Rows(index)

看看这是否有助于你获得没有施法错误的行。

Answer 3

这可能会有所帮助：

Dim index As Integer = Convert.ToInt32(e.CommandArgument)
Dim row As GridViewRow = gridFileDetails.Rows(index)

Asp.net Gridview分页的问题

3 个答案: