简单的模板列也出问题了

Question

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"  AllowPaging="True" 
OnPageIndexChanging="GridView1_PageIndexChanging" PageSize="15">
                    <Columns>
                        <asp:TemplateField>
                            <ItemTemplate>
                                <asp:CheckBox ID="chkSelect" runat="server" />
                            </ItemTemplate>
                            <HeaderTemplate>
                                <asp:CheckBox ID="ckAll" runat="server" Text="选择" OnCheckedChanged="ckAll_CheckedChanged" AutoPostBack="True" />
                            </HeaderTemplate>
                        </asp:TemplateField>
                        <asp:BoundField DataField="led_id" HeaderText="屏幕ID" />
                   </Columns>
</asp:GridView>为什么模板列中的ID,如chkSelect，ckAll在后台获得不到？还是我的代码有问题？

Answer 1

因为你是在GridView1里添加的，生成后它的id就改变了，你可以查看下页面源码就会发现这个问题了
解决办法是用FindControl方法在你对应的行里去找这个CheckBox

Answer 2

 protected void ckAll_CheckedChanged(object sender, EventArgs e)
    {
        for (int i = 0; i < GridView1.Rows.Count; i++)
        {
            CheckBox checkbox1 = (CheckBox)GridView1.Rows[i].FindControl("chkSelect");
            if (ckAll.Checked == true)
            {
                checkbox1.Checked = true;
          
            }
            else
            {
                checkbox1.Checked = false;
            }        }
    }我只是在后台使用，然后ckAll总是提示不存在

Answer 3

ckAll 也要CheckBox checkbox1 = (CheckBox)GridView1.Rows[i].FindControl("chkSelect");这样拿

Answer 4

 
for (int i = 0; i < this.GridView1.Items.Count; i++)
{
     CheckBox cbox = (CheckBox)GridView1.Items[i].FindControl("chkSelect");
     if(cbox.Checked)
     {
          ....
     }
 }

Answer 5

谢谢
解决办法是用FindControl方法在你对应的行里去找这个CheckBox