如果您已将gridviews的AllowPaging属性设置为“true”，但未处理PageIndexChanging事件，则会引发此错误。

要使用分页，请将PageIndexChanging事件处理程序添加到grid，并将标记和代码更改为：

<asp:GridView ID="SubmitAppraisalGrid" runat="server" 
                AutoGenerateColumns="False" BorderWidth="0px" 
                onrowcreated="SubmitAppraisalGrid_RowCreated" ShowHeader="False" 
                style="margin-right: 0px" AllowPaging="True" PageSize="1" 
                onselectedindexchanging="SubmitAppraisalGrid_SelectedIndexChanging"
                OnPageIndexChanging="SubmitAppraisalGrid_PageIndexChanging">
               </asp:GridView>

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///

protected void gvList_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
    SubmitAppraisalGrid.PageIndex = e.NewPageIndex;
    SubmitAppraisalGrid.DataBind();

    //bindGrid(); 
    //SubmitAppraisalGrid.PageIndex = e.NewPageIndex;
    //SubmitAppraisalGrid.DataBind();
}

protected void SubmitAppraisalGrid_SelectedIndexChanging(object sender, GridViewSelectEventArgs e)
{
   /// you selected index related logic here.
}

型
以编程方式设置PageIndex属性时不会引发此事件。请查看GridView.PageIndexChanging Event的MSDN文档
供参考：The GridView fired event PageIndexChanging which wasn't handled

您的代码应该在OnPageIndexChanging事件中

protected void SubmitAppraisalGrid_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        SubmitAppraisalGrid.PageIndex = e.NewPageIndex;
        SubmitAppraisalGrid.DataBind();
    }

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设计图：

<asp:GridView ID="SubmitAppraisalGrid" runat="server" 
            AutoGenerateColumns="False" BorderWidth="0px" 
            onrowcreated="SubmitAppraisalGrid_RowCreated" ShowHeader="False" 
            style="margin-right: 0px" AllowPaging="True" PageSize="1" 
            OnPageIndexChanging="SubmitAppraisalGrid_PageIndexChanging">
           </asp:GridView>

型

尝试

OnPageIndexChanging="SubmitAppraisalGrid_PageIndexChanging"

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而不是

onselectedindexchanging="SubmitAppraisalGrid_SelectedIndexChanging"

protected void SubmitAppraisalGrid_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
    SubmitAppraisalGrid.PageIndex = e.NewPageIndex;
    BindGrid();
}

型

代替使用

SubmitAppraisalGrid.PageIndex = e.NewSelectedIndex;

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您必须使用

SubmitAppraisalGrid.PageIndex = e.NewPageIndex;

型
如果你再次出错，请把错误也贴出来。

一步一步：
1.从design中选择gridview，然后转到property并触发事件（PageIndexChanging）
1.产品编号：gridviewname.pageindex=e.NewPageIndex;

您需要从已选择的索引更改事件中调用Pageindex更改事件。

protected void PageDropDownList_SelectedIndexChanged(Object sender, EventArgs e)
{
     // Retrieve the pager row.
    GridViewRow pagerRow = SubmitAppraisalGrid.BottomPagerRow;

    // Retrieve the PageDropDownList DropDownList from the bottom pager row.
    DropDownList pageList = (DropDownList)pagerRow.Cells[0].FindControl("PageDropDownList");

    // Set the PageIndex property to display that page selected by the user.
    GridViewPageEventArgs evt = new GridViewPageEventArgs(pageList.SelectedIndex);
    SubmitAppraisalGrid_PageIndexChanging(sender, evt);
}

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