请问怎样对GridView模板列EditItem中的DropDownList进行数据绑定

Question

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
             string sCgyNam = ((Label)e.Row.Cells[1].FindControl("lbCgyNam")).Text.Trim();
             DropDownList drop = (DropDownList)e.Row.FindControl("dropCgyNam");  // 找不到dropCgyNam           
                Function.BindDropDownList(drop, "nam", "id", "类别");
                //drop.Items.FindByText(sCgyNam).Selected = true;
            
        }
    }

Answer 1

Function.BindDropDownList(drop, "nam", "id", "类别");
这个是自己写的一个绑定DropDownList的函数----
关键是怎么获得EditItem中ID为dropCgyNam的DropDownList

Answer 2

把你的.aspx中这个模版列的定义也贴出来，另外：
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{ 
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
string sCgyNam = ((Label)e.Row.Cells[1].FindControl("lbCgyNam")).Text.Trim();
DropDownList drop = (DropDownList)e.Row.FindControl("dropCgyNam");  // 找不到dropCgyNam            if(drop!=null)
{
Function.BindDropDownList(drop, "nam", "id", "类别");
}
    }
}

Answer 3

aspx:
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
                        Width="337px" OnRowDataBound="GridView1_RowDataBound" OnRowEditing="GridView1_RowEditing" OnRowUpdating="GridView1_RowUpdating">
                        <Columns>
                            <asp:BoundField DataField="id" HeaderText="车号" />
                            <asp:TemplateField HeaderText="类型">
                                <EditItemTemplate>
                                    <asp:DropDownList ID="dropCgyNam" runat="server" Style="position: relative" Width="107px">  <<----------在这里
                                    </asp:DropDownList>
                                </EditItemTemplate>
                                <ItemTemplate>
                                    <asp:Label ID="lbCgyNam" runat="server" Text='<%# Bind("nam") %>'></asp:Label>
                                </ItemTemplate>
                            </asp:TemplateField>
                            <asp:CommandField ShowEditButton="True" />
                        </Columns>
                    </asp:GridView>

Answer 4

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if(e.Row.RowType == DataControlRowType.DataRow)
        {
                //保存当前行的au_id的值
                string au_id = this.GridView1.DataKeys[e.Row.RowIndex]["au_id"].ToString();
        
        //对DropDownList做数据绑定
                DropDownList dropTemp = (DropDownList)e.Row.Cells[0].FindControl("dropTemp");                SqlConnection cn = new SqlConnection(@"server=.\SQLExpress;uid=sa;pwd=password;database=pubs");
                string strSQL = "select au_id from authors";
                SqlCommand cmd = new SqlCommand(strSQL, cn);
                cn.Open();                dropTemp.DataSource = cmd.ExecuteReader();
        dropTemp.DataTextField = "au_id";
        dropTemp.DataBind();                //到DropDownList中根据au_id的值去找需要设置为选中状态的项目，将其设置为选中
                ListItem item = dropTemp.Items.FindByText(au_id);
                if(item != null)
                {
                    item.Selected = true;
                }
                cn.Close();
        }
        }

Answer 5

你关键的问题在这里，没有指明单元格
DropDownList dropTemp = (DropDownList)e.Row.Cells[0].FindControl("dropTemp");

Answer 6

TO:amandag(高歌) 
//对DropDownList做数据绑定
DropDownList dropTemp = (DropDownList)e.Row.Cells[0].FindControl("dropTemp");-------这个也找不到EditItem里的DropDownList

Answer 7

你要学会看位置啊你的第一个是 <asp:BoundField DataField="id" HeaderText="车号" />所以现在就是
DropDownList dropTemp = (DropDownList)e.Row.Cells[1].FindControl("dropTemp");

Answer 8

TO:amandag(高歌) 
//对DropDownList做数据绑定
DropDownList dropTemp = (DropDownList)e.Row.Cells[0].FindControl("dropTemp");
-----
这个是你的我的是：DropDownList drop = (DropDownList)e.Row.Cells[1].FindControl("dropCgyNam");
单步执行完这句后发现drop 为null

Answer 9

问题是可以访问ItemTemplate中的drop 
但是取不到EditTemplate中的drop

Answer 10

当然访问不到
应该是：
(DropDownList)GridView1.Rows[e.RowIndex].FindControl("drpCgyNam")