Question

我的ASP网站上有一个gridview需要处理每一行，并根据条件保留行或删除它并将其添加到另一个gridview。我已经想出了如何通过简单地使用其中一个内置方法来删除行。我在网上找到的所有东西都告诉我使用“gridview.Rows.Add（row）”属性，但它在Visual Studio中创建了以下错误：

“'添加'不是'System.Web.UI.WebControls.GridViewRowCollection'的成员。”

grdTraining是包含要检查结果的“主”gridview。
grdExpTraining是“辅助”网格视图，它从“主”中获取行。

grdTraining_RowDataBound是每当网站找到要放入grdTraining的记录时调用的方法。

Protected Sub grdTraining_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles grdTraining.RowDataBound

   ' Grey out expired training courses
   Dim row As GridViewRow
   row = e.Row
   Dim incomingDate As String
   incomingDate = row.Cells(4).Text.ToString()

   If (e.Row.RowType <> DataControlRowType.DataRow) Then
       Exit Sub
   End If

   Try
       Dim expDate As Date = incomingDate
       If (expDate < DateTime.Today) Then
           grdExpTraining.Rows.Add(row)    'The line that is causing the error
           grdTraining.DeleteRow(trnIndex)
       End If
   Catch ex As Exception
   End Try

   trnIndex += 1
End Sub

Answer 1

我可以使用以下代码在网格视图中添加一行。我基本上不得不重新完成整个过程，将嵌套的gridview视为一个全新的gridview。这仅适用于您计划在嵌套网格视图中放置一行的情况。您可以使用DataTable和DataRow声明的范围来执行其他操作。

            'Create datatable and columns
            Dim dtable As New DataTable
            dtable.Columns.Add(New DataColumn("StateCode"))
            dtable.Columns.Add(New DataColumn("CourseDesc"))
            dtable.Columns.Add(New DataColumn("Hours"))
            dtable.Columns.Add(New DataColumn("EffectiveDate"))
            dtable.Columns.Add(New DataColumn("ExpirationDate"))
            dtable.Columns.Add(New DataColumn("LastChange"))

            'Create counter to prevent out of bounds exception
            Dim i As Integer = row.Cells.Count

            'Create object for RowValues
            Dim RowValues As Object() = {"", "", "", "", "", ""}

            'Fill row values appropriately
            For index As Integer = 0 To i - 1
                RowValues(index) = row.Cells(index).Text
            Next

            'create new data row
            Dim dRow As DataRow
            dRow = dtable.Rows.Add(RowValues)
            dtable.AcceptChanges()

            'now bind datatable to gridview... 
            grdExpTraining.DataSource = dtable
            grdExpTraining.DataBind()

Answer 2

我认为您需要在grdExpTraining上使用CopyTo，将该行添加到ArrayList，然后再次初始化GridViewRowCollection。

Answer 3

如果你想在gridview上自动行，比如从db记录计数得到一些学生信息是n，那么这可能会有所帮助。

HTML

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
    CellPadding="2" CellSpacing="1" DataKeyNames="Roll_No,ID_Number,Marks,Remarks" ForeColor="#333333" GridLines="None">
        <AlternatingRowStyle BackColor="White" />
        <Columns>
          <asp:TemplateField HeaderText="Roll No">
            <ItemTemplate>
              <asp:Label ID="txtRoll_No" runat="server"></asp:Label>
            </ItemTemplate>
          </asp:TemplateField>
          <asp:TemplateField HeaderText="ID Number">
            <ItemTemplate>
              <asp:Label ID="txtID_Number" runat="server"></asp:Label>
            </ItemTemplate>
          </asp:TemplateField>
          <asp:TemplateField HeaderText="Marks">
            <ItemTemplate>
              <asp:TextBox ID="txtMarks" runat="server" Width="50px" CssClass="text" 
            Text=""></asp:TextBox>
            </ItemTemplate>
          </asp:TemplateField>
          <asp:TemplateField HeaderText="Remarks">
            <ItemTemplate>
              <asp:TextBox ID="txtRemarks" runat="server" CssClass="text" Width="200"></asp:TextBox>
            </ItemTemplate>
          </asp:TemplateField>
        </Columns>
        <EditRowStyle BackColor="#2461BF" />
        <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
        <RowStyle BackColor="#EFF3FB" />
        <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
        <SortedAscendingCellStyle BackColor="#F5F7FB" />
        <SortedAscendingHeaderStyle BackColor="#6D95E1" />
        <SortedDescendingCellStyle BackColor="#E9EBEF" />
        <SortedDescendingHeaderStyle BackColor="#4870BE" />
      </asp:GridView>

VB.NET代码

Dim dt As New DataTable()
Dim i As Integer
dt.Columns.Add(New DataColumn("Roll_No"))
dt.Columns.Add(New DataColumn("ID_Number"))
dt.Columns.Add(New DataColumn("Marks"))
dt.Columns.Add(New DataColumn("Remarks"))
For i = 1 To 10
  Dim dRow As DataRow      
  dRow = dt.NewRow
  dt.Rows.Add(dRow)    
  dt.AcceptChanges()      
Next i
'now bind datatable to gridview... 
GridView1.DataSource = dt
GridView1.DataBind()

With GridView1
  For i = 0 To .Rows.Count - 1
    Dim Roll_No As Label = DirectCast(.Rows(i).Cells(1).FindControl("txtRoll_No"), Label)
    Dim ID_Number As Label = DirectCast(.Rows(i).Cells(2).FindControl("txtID_Number"), Label)        
    Roll_No.Text = i + 1
    ID_Number.Text = "2014-01-" & i + 1
  Next
End With

如果要逐个插入单行，可以编辑标记和备注以及INSERT INTO DB，然后只需删除循环。

在Visual Basic中向gridview添加行

3 个答案: