未将对象引用设置到对象的实例?

[aaa361755438]

我做了个Repeater的批量删除，
页面上是这样的
<asp:Repeater ID="Repeater1" runat="server">

<ItemTemplate>
<tr bgcolor="#FFFFFF">
<td width="4%" align="center" class="txt12_18_cg">
<asp:CheckBox ID="CheckBox" runat="server" />
<input id= "idname" type="hidden" name= "fieldname " runat= "server" value='<%#DataBinder.Eval(Container.DataItem,"Id") %>'/></td>
<td width="10%" class="txt12_18_cg"><%#DataBinder.Eval(Container.DataItem,"Id") %></td>
<td class="txt12_18_cg"><%#DataBinder.Eval(Container.DataItem,"ISBN") %></td>
<td width="8%" class="txt12_18_cg" align="center"><%#DataBinder.Eval(Container.DataItem,"bookName") %></td>
<td width="12%" class="txt12_18_cg" align="center"><%#DataBinder.Eval(Container.DataItem,"price") %></td>
<td width="10%" class="txt12_18_cg" align="center"><%#DataBinder.Eval(Container.DataItem,"number") %></td>
<td width="10%" class="txt12_18_cg" align="center"><%#DataBinder.Eval(Container.DataItem,"myang") %></td>
<td width="10%" class="txt12_18_cg" align="center"><%#DataBinder.Eval(Container.DataItem, "bookSpec")%></td>
</tr>
</ItemTemplate>

</asp:Repeater>
cs里代码：
protected void Button1_Click(object sender, EventArgs e)
{
//Button1.Attributes["onclick"] = "return confirm('你确实要删除吗?')";

string ID= "";
foreach (RepeaterItem item in this.Repeater1.Items)
{
CheckBox ck = (CheckBox)item.FindControl("CheckBox");
if (ck.Checked)
{
HtmlInputHidden inputhidden = (HtmlInputHidden)item.FindControl("fieldname ");
ID += inputhidden.Value.Trim() + ",";
}
}
if (ID.Length == 0)
{
this.Page.RegisterStartupScript(" ", " <script> alert( '没有选定删除项 ');window.location.href=window.location.href; </script> ");
}
else
{
ID = ID.Remove(ID.Length - 1, 1);
Info.DelId = ID;
Fun fun = new Fun();
fun.DelshaixuanId();
Response.Write("<script language='javascript'>alert('删除成功');</script>");
}

}




它说我这句话ID += inputhidden.Value.Trim() + ",";
未将对象引用设置到对象的实例。什么意思啊？

[oyjd614]

楼主在找repeter中的控件方法有无，必须要在repeter的时间中用findcontrol来寻找才有效，不然会告诉你未将对象实例化。
例如：

 protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {

        if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item)
        {
            ((Button)Repeater1.Controls[Repeater1.Controls.Count-1].FindControl("Delete")).Attributes["onclick"] = "if(!confirm('你真的要删除这条记录么?'))return   false;";
        }

或者：

  protected void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)
    {
        String Index = ((Label)Repeater1.Items[e.Item.ItemIndex].FindControl("lblID")).Text;

[sunrain_yingxi]

HtmlInputHidden inputhidden = (HtmlInputHidden)item.FindControl("idname");

[feng5799]

HtmlInputHidden inputhidden = (HtmlInputHidden)item.FindControl("idname"); 
if(inputhidden  != null)
{
    ID += inputhidden.Value.Trim() + ","; 
}

[aaa361755438]

我先试试

[aaa361755438]

一楼二楼的都不行啊，你们的答案效果都一样
如果像二楼的那样写的话，程序根本就不会运用ID += inputhidden.Value.Trim() + ",";

[Plougher]

inputhidden有没有啊？？

[robertwang0499]

可能是你重复初始化了这个控件吧！这个问题能经常遇到。

[aaa361755438]

看我页面上就知道了阿

[aaa361755438]

什么重复使用啊，说的具体点好吗？问题解决了我就给分