DropDownList SelectedIndexChanged事件在GridView HeaderTemplate中未触发

问题描述

我正在工作单位网站上工作，特别是职位搜索页面。我将所发现的工作返回到 DataBound GridView （即 gvwJobs ），并且在 HeaderTemplate 中，我有一个 DropDownList 命名为 ddlSortDirection 它指定执行排序的方向：

I am working on a job board website and specifically the job search page at the moment. I am returning the jobs found into a DataBound GridView (namely gvwJobs), and within the HeaderTemplate I have a DropDownList named ddlSortDirection which specifies the direction in which the sorting is performed:

<asp:DropDownList runat="server" ID="ddlSortDirection" AutoPostBack="true" OnSelectedIndexChanged="ddlSortDirection_SelectedIndexChanged">

    <asp:ListItem Value="DESC">DOWN</asp:ListItem>
    <asp:ListItem Value="ASC">UP</asp:ListItem>

</asp:DropDownList>

如您所见，我确保 AutoPostBack 开了。我还在 GridView 的 DataBound 事件中创建了一个自定义事件处理程序：

As you can see, I have ensured that AutoPostBack is on. I have also created a custom event handler on the GridView's DataBound event as so:

Protected Sub gvwJobs_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvwJobs.RowDataBound

    If e.Row.RowType = DataControlRowType.Header Then

                ddlSortDirection.AutoPostBack = True
                AddHandler ddlSortDirection.SelectedIndexChanged, AddressOf ddlSortDirection_SelectedIndexChanged


     End If

End Sub

我发现 ddlSortDirection_SelectedIndexChanged 当在 ddlSortDirection 中更改选择时，不会调用SubProcedure。我可以看到发生了一个 PostBack ，但该方法绝对不被调用。我尝试的是在 GridView 之外创建一个类似的 DropDownList ，并成功触发了 SelectedIndexChanged 事件，甚至没有一个自定义的事件处理程序！

I am finding that the ddlSortDirection_SelectedIndexChanged SubProcedure is not called when the selection is changed in ddlSortDirection. I can see that a PostBack occurs, but the method is definitely not called. What I have tried doing is creating a similar DropDownList outside of the GridView and that successfully triggered the SelectedIndexChanged event without even having a custom event handler!

请帮助我实现我的目标，一个 DropDownList 在$ code的 HeaderTemplate 内触发 SelectedIndexChanged 事件> GridView ？

Please could you help me to achieve my goal of having a DropDownList firing the SelectedIndexChanged event when within a HeaderTemplate of a GridView?

推荐答案

设置 EnableViewState 该GridView为false

set the EnableViewState of that GridView to false

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