从存储过程中填充下拉列表错误：超出有效值范围

Question

由于某种原因，我的 DataGrid 中的下拉列表给了我错误：

Specified argument was out of the range of valid values.
Parameter name: index

从行：

 CType(dgAdmins.Controls(0).Controls(dgAdmins.Controls(0).Controls.Count - 1).Controls(0).FindControl("ddlAddGroup"), DropDownList).DataSource = rdr

我以前见过此代码设置工作，所以不确定我缺少什么。我的 templateColumn 是 DataGrid 中的第二列。

vb.net

Sub dg_Edit(ByVal s As Object, ByVal e As DataGridCommandEventArgs)
    fillGroups()
End sub

Sub fillGroups()

    Using con2 As New MySqlConnection

        con2.ConnectionString = GetconnString(strFloor, lblDB.Text)

        Dim cmd2 As New MySqlCommand()
        con2.Open()
        cmd2.Connection = con2
        cmd2.CommandText = "stp_Select_GroupNames"

        cmd2.CommandType = System.Data.CommandType.StoredProcedure

        Dim rdr As MySqlDataReader

        rdr = cmd2.ExecuteReader

        CType(dgAdmins.Controls(0).Controls(dgAdmins.Controls(0).Controls.Count - 1).Controls(0).FindControl("ddlAddGroup"), DropDownList).DataSource = rdr
        CType(dgAdmins.Controls(0).Controls(dgAdmins.Controls(0).Controls.Count - 1).Controls(0).FindControl("ddlAddGroup"), DropDownList).DataValueField = "ID"
        CType(dgAdmins.Controls(0).Controls(dgAdmins.Controls(0).Controls.Count - 1).Controls(0).FindControl("ddlAddGroup"), DropDownList).DataTextField = "GroupName"
        CType(dgAdmins.Controls(0).Controls(dgAdmins.Controls(0).Controls.Count - 1).Controls(0).FindControl("ddlAddGroup"), DropDownList).DataBind()
        rdr.Close()
        con2.Close()
    End Using
End sub

ASP.net

<asp:TemplateColumn HeaderText="'Group'" ItemStyle-Width="225" FooterStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center">
         <FooterTemplate>
            <asp:DropDownList ID="ddlAddGroup" runat="server" />
         </FooterTemplate>
         <ItemTemplate>
             <%#Container.DataItem("GroupName")%>
         </ItemTemplate>
         <EditItemTemplate>
             <asp:DropDownList ID="ddlEditGroup" runat="server" />
          </EditItemTemplate>
   </asp:TemplateColumn>

更新

存储过程

CREATE DEFINER=`root`@`%` PROCEDURE `stp_Select_GroupNames`()
BEGIN
SELECT ID, GroupName from tblg;
END  

当我从存储过程中运行数据集时，我会返回一个计数，因此我知道我也会返回记录。

Answer 1

当前解决方法：

所以要填充你使用的页脚：

Sub fillAddGroups()
    Dim ds As DataSet = getGroups()
    Dim dd As DropDownList = CType(dgAdmins.Controls(0).Controls(dgAdmins.Controls(0).Controls.Count - 1).Controls(0).FindControl("ddlAddGroup"), DropDownList)
    dd.DataSource = ds
    dd.DataValueField = "ID"
    dd.DataTextField = "GroupName"
    dd.DataBind()
End Sub

要填充单击编辑按钮后显示的下拉列表：

Sub dg_Edit(ByVal s As Object, ByVal e As DataGridCommandEventArgs)
    Dim intempId As Integer
    Dim strGroup As String = ""
    intempId = CType(e.Item.Cells(0).FindControl("lblEmployeeNumber"), Label).Text
    strGroup = CType(e.Item.Cells(0).FindControl("lblGroup"), Label).Text
    dgAdmins.EditItemIndex = e.Item.ItemIndex
    sdsGroups.ConnectionString = GetconnString(strF, lblDB.Text)
    ShowEmpTable(intempId)
    fillAddGroups()
End Sub

其中 sdsGroups 是 HTML 中的 SqlDataSource：

<asp:SqlDataSource ID="sdsGroups"
               ProviderName="MySql.Data.MySqlClient" SelectCommandType="StoredProcedure" SelectCommand="stp_Select_FloortblGroupNames" runat="server" />

网格视图修改

<asp:TemplateColumn HeaderText="'Group'" ItemStyle-Width="225" FooterStyle-HorizontalAlign="Center" ItemStyle-HorizontalAlign="Center">
      <FooterTemplate>
          <asp:DropDownList ID="ddlAddGroup" runat="server" />
            </FooterTemplate>
                <ItemTemplate>
                   <asp:Label ID="lblGroup" Text='<%#Container.DataItem("GroupName")%>' runat="server" />
                </ItemTemplate>
             <EditItemTemplate>
                <asp:DropDownList ID="ddlEditGroup" runat="server" DataSourceID="sdsGroups" DataTextField="GroupName" DataValueField="ID"/>
              </EditItemTemplate>
       </asp:TemplateColumn>