Asp.net 对象发送者属性值

我有一个问题，我想在单选按钮选择更改时检索后端数据绑定字段reg_id的值。请告诉我我做错了

<asp:GridView ID="GridView1" runat="server" class="gridview" AutoGenerateColumns="False" DataKeyNames="reg_id" onrowcommand="GridView1_RowCommand">                       

<Columns>
<asp:BoundField  DataField="reg_id" Visible="false" />

<asp:TemplateField>
<ItemTemplate>

<div style="width:100px; float:left;">
<asp:Label ID="Label2" runat="server" Text="<%# bind('username') %>" ></asp:Label>
</div>

<div style="width:100px; float:left;">
<asp:Label ID="Label4" runat="server" Text="<%# bind('country') %>" ></asp:Label>
</div>

<div style="width:100px; float:left;">
<asp:Label ID="Label6" runat="server" Text="<%# bind('city') %>" ></asp:Label>
</div>

<div style="width:100px; float:left;">
<asp:Label ID="Label7" runat="server" Text="<%# bind('locality') %>" ></asp:Label>
</div>

<div style="width:100px; float:left;">
<asp:Label ID="Label5" runat="server" Text="No of Posts"></asp:Label>
</div>

<asp:RadioButton GroupName="a" ID="RadioButton1" runat="server" AutoPostBack="true" OnCheckedChanged="change_attributes" value='<%#Eval("reg_id")%>'  />

<asp:RadioButton GroupName="a" ID="RadioButton2" runat="server" AutoPostBack="true" />


</ItemTemplate>

</asp:TemplateField>
</Columns>

</asp:GridView>

后端代码：这里我想通过对象发送方值属性检索数据绑定字段reg_id值的值

for (int i = 0; i < GridView1.Rows.Count; i++)
{

RadioButton radio1 = (RadioButton)GridView1.Rows[i].FindControl("RadioButton1");

RadioButton radio2 = (RadioButton)GridView1.Rows[i].FindControl("RadioButton2");

string id = "";

RadioButton btn = (RadioButton)sender;

id = btn.Attributes.ToString();              

}

for（int i=0；i

试试这个：

protected void change_attributes(object sender, EventArgs e)
{
    var value = (sender as RadioButton).Attributes["value"];
}

---

您需要获取所有行的值吗？为什么是循环？您不需要已绑定到单选按钮的值来导致回发？实际上，我希望在选中单选按钮的位置检索注册表id的值。不是全部。在单选按钮事件中选中ChangeThank@Amir Abbas Sherafatian