我有一个嵌套的GridView到5级（对于演示我给了2个级别）我很难访问在GridView的第二级选择哪个RadioButtonList。 （第一级被命名为gvSecondLevel，所以请不要混淆）。我现在必须从gvThirdLevel 访问（实际上是二级网格，你会在代码中看到）。< / em>的
这是aspx代码：
<table align="left">
<tr>
<td colspan="2">
<asp:GridView ID="gvSecondLevel" runat="server" AutoGenerateColumns="False" Width="800px"
ShowFooter="True" BorderStyle="none" DataKeyNames="CallCategory_ID" OnRowDataBound="gvSecondLevel_OnRowDataBound"
OnRowCommand="gvSecondLevel_RowCommand" OnRowDeleting="gv_RowDeleting" AllowPaging="true"
PageSize="10" OnPageIndexChanging="gvSecondLevel_PageIndexChanging" OnRowCreated="gvSecondLevel_RowCreated" >
<Columns>
<asp:TemplateField ItemStyle-Width="20px">
<ItemTemplate>
<a href="JavaScript:divexpandcollapse('div<%# Eval("CallCategory_ID") %>','<%# Eval("CallCategory_Name") %>','td_div<%# Eval("CallCategory_ID") %>');">
<img id="imgdiv<%# Eval("CallCategory_ID") %>" border="0" src="ProjectImages/expandDown.png"
alt="" /></a>
</ItemTemplate>
<ItemStyle Width="20px" VerticalAlign="Middle"></ItemStyle>
</asp:TemplateField>
<asp:TemplateField HeaderText="ID" HeaderStyle-Width="20px">
<ItemTemplate>
<asp:Label ID="lblBusinessID" runat="server" Text='<%#DataBinder.Eval(Container.DataItem,"CallCategory_ID") %>'></asp:Label>
</ItemTemplate>
<HeaderStyle Width="20px" />
</asp:TemplateField>
<asp:BoundField DataField="CallCategory_Name" HeaderText="Call Category Name 2nd" />
<asp:TemplateField HeaderText="" ItemStyle-Width="20px">
<ItemTemplate>
<asp:LinkButton ID="lbtnDeleteSecondLevel" CommandArgument='<%# Eval("CallCategory_ID") %>'
CommandName="Delete" runat="server"></asp:LinkButton>
</ItemTemplate>
<ItemStyle Width="20px" />
</asp:TemplateField>
<asp:TemplateField HeaderStyle-BorderStyle="None" FooterStyle-BorderStyle="None"
ItemStyle-BorderStyle="None">
<ItemTemplate>
<tr>
<td id="td_div<%# Eval("CallCategory_ID") %>" colspan="100%" style="border: none;">
<div id="div<%# Eval("CallCategory_ID") %>" style="overflow: auto; display: none;
position: relative; left: 15px; overflow: auto">
<asp:GridView ID="gvThirdLevel" runat="server" Width="95%" AutoGenerateColumns="false"
ShowFooter="true" BorderStyle="none" DataKeyNames="CallCategory_ID" OnRowDataBound="gvThirdLevel_OnRowDataBound"
OnRowCommand="gvThirdLevel_RowCommand" OnRowDeleting="gv_RowDeleting">
<Columns>
<asp:TemplateField ItemStyle-Width="20px">
<ItemTemplate>
<a href="JavaScript:divexpandcollapseThird('div1<%# Eval("CallCategory_ID") %>','<%# Eval("CallCategory_Name") %>','td_div1<%# Eval("CallCategory_ID") %>');">
<img id="imgdiv1<%# Eval("CallCategory_ID") %>" border="0" src="ProjectImages/expandDown.png"
alt="" /></a>
</ItemTemplate>
<ItemStyle Width="20px" VerticalAlign="Middle"></ItemStyle>
</asp:TemplateField>
<asp:TemplateField HeaderText="ID" Visible="true" HeaderStyle-Width="20px">
<ItemTemplate>
<asp:Label ID="lblCallCategoryID" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "CallCategory_ID") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="CallCategory_Name" HeaderText="Call Category Name 3rd" />
<asp:TemplateField HeaderText="" ItemStyle-Width="20px">
<ItemTemplate>
<asp:LinkButton ID="lbtnDeleteThirdLevel" CommandArgument='<%# Eval("CallCategory_ID") %>'
CommandName="Delete" runat="server">Deactivate</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
</Columns>
<EmptyDataTemplate>
<div style="color: #CC3300">
No Category Found!</div>
</EmptyDataTemplate>
<HeaderStyle BackColor="#0063A6" ForeColor="White" />
<FooterStyle BackColor="#0063A6" ForeColor="White" />
</asp:GridView>
<p>rbThirdLevel below gvThirdLevel</p>
<asp:RadioButtonList ID="rbThirdLevel" runat="server" onselectedindexchanged="rbThirdLevel_SelectedIndexChanged" RepeatDirection="Horizontal" AutoPostBack="True">
<asp:ListItem Selected="True">Active</asp:ListItem>
<asp:ListItem>Inactive</asp:ListItem>
</asp:RadioButtonList>
<p></p>
New Category:
<asp:TextBox ID="txtAddCategorySecondLevel" runat="server" ></asp:TextBox>
<asp:Button ID="btnAddCategorySecondLevel" runat="server" Text="Add 2nd" OnClick="btnAddCategorySecondLevel_Click" CssClass="btn" />
</div>
</td>
</tr>
</ItemTemplate>
<HeaderStyle BackColor="#FFFFFF"></HeaderStyle>
<FooterStyle BackColor="#FFFFFF" BorderStyle="None"></FooterStyle>
<ItemStyle BorderStyle="None" />
</asp:TemplateField>
</Columns>
<EmptyDataTemplate>
<div style="color: #CC3300">
No Data Found!</div>
</EmptyDataTemplate>
<HeaderStyle BackColor="#003E66" ForeColor="White" />
<FooterStyle BackColor="#003E66" ForeColor="White" BorderStyle="None" />
<PagerStyle BackColor="White" BorderStyle="None" BorderColor="White" />
</asp:GridView>
<p>2nd Level below </p>
<asp:RadioButtonList ID="rbSecondLevel" runat="server" onselectedindexchanged="rbSecondLevel_SelectedIndexChanged" RepeatDirection="Horizontal" AutoPostBack="True">
<asp:ListItem Selected="True">Active</asp:ListItem>
<asp:ListItem>Inactive</asp:ListItem>
</asp:RadioButtonList>
<p></p>
<asp:Label ID="lblMainLevel" runat="server" Text="New Category:" Visible="false"></asp:Label>
<asp:TextBox ID="txtAddCategoryMainLevel" runat="server" Visible="false"></asp:TextBox>
<asp:Button ID="btnAddCategoryMainLevel" runat="server" Text="Add Main" OnClick="btnAddCategoryMainLevel_Click" CssClass="btn" Visible="false" />
</td>
</tr>
</table>
这是cs代码。 rbThirdLevel返回null，行字符串radiovalue，我尝试访问所选的单选按钮的值抛出错误，＆＃34;对象引用未设置为对象的实例。＆＃34; 我将非常感谢你的帮助。
protected void rbThirdLevel_SelectedIndexChanged(object sender, EventArgs e)
{
string ItemStatus = String.Empty;
DataTable Categories = new DataTable();
foreach (GridViewRow row in gvSecondLevel.Rows)
{
if (row.RowType == DataControlRowType.DataRow)
{
GridView gvThirdLevel = (GridView)row.FindControl("gvThirdLevel");
if (gvThirdLevel != null)
{
foreach (GridViewRow row2 in gvThirdLevel.Rows)
{
RadioButtonList rbThirdLevel = gvThirdLevel.Rows[row2.RowIndex].FindControl("rbThirdLevel") as RadioButtonList;
string radiovalue = (gvThirdLevel.Rows[row2.RowIndex].FindControl("rbThirdLevel") as RadioButtonList).SelectedItem.Value;
if (radiovalue == "Inactive")
{
ItemStatus = "N";
Categories = BLL.BLCommon.Select_CallCategoryListbyStatus(ItemStatus);
}
if (radiovalue == "Active")
{
ItemStatus = "Y";
Categories = BLL.BLCommon.Select_CallCategoryListbyStatus(ItemStatus);
}
}
}
}
}
}