asp.net 控件查找

Question

如何在后台通过调用控件ID ，获取所对应的值： 
前台代码，如下：
<ul class="ul_1">
                <li>
                    <asp:RadioButtonList runat="server" ID="RadioButtonLis1" RepeatColumns="5" RepeatLayout="Table">
                        <asp:ListItem Text="5分" Value="5"></asp:ListItem>
                        <asp:ListItem Text="4分" Value="4"></asp:ListItem>
                        <asp:ListItem Text="3分" Value="3"></asp:ListItem>
                        <asp:ListItem Text="2分" Value="2"></asp:ListItem>
                        <asp:ListItem Text="1分" Value="1"></asp:ListItem>
                    </asp:RadioButtonList></li>
                <li>
                    <asp:RadioButtonList runat="server" ID="RadioButtonList1" RepeatColumns="5" RepeatLayout="Table">
                        <asp:ListItem Text="5分" Value="5"></asp:ListItem>
                        <asp:ListItem Text="4分" Value="4"></asp:ListItem>
                        <asp:ListItem Text="3分" Value="3"></asp:ListItem>
                        <asp:ListItem Text="2分" Value="2"></asp:ListItem>
                        <asp:ListItem Text="1分" Value="1"></asp:ListItem>
                    </asp:RadioButtonList></li>
                <li>
                    <asp:RadioButtonList runat="server" ID="RadioButtonList2" RepeatColumns="5" RepeatLayout="Table">
                        <asp:ListItem Text="5分" Value="5"></asp:ListItem>
                        <asp:ListItem Text="4分" Value="4"></asp:ListItem>
                        <asp:ListItem Text="3分" Value="3"></asp:ListItem>
                        <asp:ListItem Text="2分" Value="2"></asp:ListItem>
                        <asp:ListItem Text="1分" Value="1"></asp:ListItem>
                    </asp:RadioButtonList></li>
                <li>
                    <asp:RadioButtonList runat="server" ID="RadioButtonList3" RepeatColumns="5" RepeatLayout="Table">
                        <asp:ListItem Text="5分" Value="5"></asp:ListItem>
                        <asp:ListItem Text="4分" Value="4"></asp:ListItem>
                        <asp:ListItem Text="3分" Value="3"></asp:ListItem>
                        <asp:ListItem Text="2分" Value="2"></asp:ListItem>
                        <asp:ListItem Text="1分" Value="1"></asp:ListItem>
                    </asp:RadioButtonList></li>
                <li>
                    <asp:RadioButtonList runat="server" ID="RadioButtonList4" RepeatColumns="5" RepeatLayout="Table">
                        <asp:ListItem Text="5分" Value="5"></asp:ListItem>
                        <asp:ListItem Text="4分" Value="4"></asp:ListItem>
                        <asp:ListItem Text="3分" Value="3"></asp:ListItem>
                        <asp:ListItem Text="2分" Value="2"></asp:ListItem>
                        <asp:ListItem Text="1分" Value="1"></asp:ListItem>
                    </asp:RadioButtonList></li>
            </ul>后台代码如下：
public void button_click(object sender, EventArgs e)
    {
        
        string[] rdl1 = new string[4];
        for (int i = 1; i < 5; i++)
        {
            RadioButtonList rdl = new RadioButtonList();
            rdl = (RadioButtonList)Page.FindControl("RadioButtonLis" + i + "");
            rdl1[i] = rdl.SelectedValue;
        }
    }错误信息如下：行 45:             rdl.ID = "RadioButtonList_"+i;
行 46:             rdl = (RadioButtonList)Page.FindControl("RadioButtonLis" + i + "");
行 47:             rdl1[i] = rdl.SelectedValue;
行 48:         }先谢谢了~~~~~~

Answer 1

 rdl = (RadioButtonList)Page.FindControl("RadioButtonLis" + i + ""); 

Answer 2

rdl = (RadioButtonList)Page.FindControl("RadioButtonList" + i + ""); 

Answer 3

上面代码有以下问题：1.前台代码中空间id重复了RadioButtonList1，应该是从RadioButtonLis1到RadioButtonLis5
2.这句rdl = (RadioButtonList)Page.FindControl("RadioButtonLis" + i + ""); 中
    RadioButtonLis少了个t，应该是“RadioButtonList”+i+“”
3.for循环中i要从0到到5,
4.数组rdl1的大小是5，即string[] rdl1 = new string[5]; 下面是修改后的部分代码：
string[] rdl1 = new string[5]; 
for (int i = 0; i < 5; i++) 
{ 
    RadioButtonList rdl = new RadioButtonList(); 
    rdl = (RadioButtonList)Page.FindControl("RadioButtonList" + i + ""); 
    rdl1[i] = rdl.SelectedValue; 
} 

Answer 4

同三楼请将Page.FindControl改为Form.FindControl

Answer 5

两个RadioButtonLis1 不会报错嘛？
rdl = (RadioButtonList)Page.FindControl("RadioButtonLis" + i + ""); 
应该是RadioButtonList”+i+“” 

Answer 6

前台那个控件ID已改，没有重复了，后台更改后的代码如下：
public void button_click(object sender, EventArgs e)
    {
        RadioButtonList rbl = new RadioButtonList();
        string[] rdl_1 = new string[5];
        for (int i = 0; i < 5; i++)
        {
            rbl = (RadioButtonList) form1.FindControl("RadioButtonList" + i+"");
            rdl_1[i] = rdl.SelectedValue;
        }
    }调试后错误信息如下：
编译器错误信息: CS0103: 当前上下文中不存在名称“rdl”源错误: 行 42:         {
行 43:             rbl = (RadioButtonList) form1.FindControl("RadioButtonList" + i);
行 44:             rdl_1[i] = rdl.SelectedValue;
行 45:         }
行 46:     }
 

Answer 7

接上说明下，
  那个rbl ,我改过来了，不是那个错误！

Answer 8

rdl_1[i] = rbl.SelectedValue; 

Answer 9

rbl没有定义：RadioButtonList rdl = (RadioButtonList)Form.FindControl("RadioButtonList" + i + "");