c# - DataGrid OnItemDataBound 干扰 DropDownList OnSelectedIndexChange 事件

Question

我有一个带有 DataGrid 的 ASP.Net 4.6.1 网页。在DataGrid 的一个TemplateColumn 中，我有一个DropDownList。DropDownList 有一个 OnSelectedIndexChanged 事件处理程序：

<asp:DataGrid runat="server" ID="dgPartnerApprovalPending" DataKeyField="OrderID" 
                       CellPadding="10" CellSpacing="10" AlternatingItemStyle-BackColor="WhiteSmoke" HeaderStyle-BackColor="WhiteSmoke" AutoGenerateColumns="false" 
                        AllowSorting="true" OnSortCommand="dgPartnerApprovalPending_SortCommand">
                        <Columns>
                            <asp:BoundColumn DataField="AttorneyName" HeaderText="Attorney Name" SortExpression="AttorneyName" />
                            <asp:BoundColumn DataField="Title" HeaderText="Title" SortExpression="Title" />
                            <asp:BoundColumn DataField="Description" HeaderText="Description" SortExpression="Description" />
                            <asp:BoundColumn DataField="RequestDate" HeaderText="Request Date" SortExpression="RequestDate" />
                            <asp:BoundColumn DataField="TotalAmount" HeaderText="Total Amount" SortExpression="TotalAmount" />
                            <asp:BoundColumn DataField="OrderStatus" HeaderText="Order Status" SortExpression="OrderStatus" />
                            <asp:TemplateColumn HeaderText="Status">
                                <ItemTemplate>
                                    <asp:DropDownList runat="server" ID="ddlStatus" OnSelectedIndexChanged="ddlStatus_SelectedIndexChanged" AutoPostBack="true" 
                                        DataSourceID="sdsStatuses" DataTextField="OrderStatus" DataValueField="OrderStatusID" /> 
                                </ItemTemplate>
                            </asp:TemplateColumn>
                            <asp:BoundColumn DataField="OrderID" HeaderText="Order ID" SortExpression="OrderID" />
                            <asp:HyperLinkColumn Text="Files" DataNavigateUrlField="OrderID" DataNavigateUrlFormatString="~/Files/{0}" />
                        </Columns>
                    </asp:DataGrid>

OnSelectedIndexChanged 事件处理程序工作正常，直到我将 OnItemDataBound 事件处理程序添加到 DataGrid：

<asp:DataGrid runat="server" ID="dgPartnerApprovalPending" DataKeyField="OrderID" OnItemDataBound="dgPartnerApprovalPending_ItemDataBound" 
                       CellPadding="10" CellSpacing="10" AlternatingItemStyle-BackColor="WhiteSmoke" HeaderStyle-BackColor="WhiteSmoke" AutoGenerateColumns="false" 
                        AllowSorting="true" OnSortCommand="dgPartnerApprovalPending_SortCommand">
                        <Columns>
                            <asp:BoundColumn DataField="AttorneyName" HeaderText="Attorney Name" SortExpression="AttorneyName" />
                            <asp:BoundColumn DataField="Title" HeaderText="Title" SortExpression="Title" />
                            <asp:BoundColumn DataField="Description" HeaderText="Description" SortExpression="Description" />
                            <asp:BoundColumn DataField="RequestDate" HeaderText="Request Date" SortExpression="RequestDate" />
                            <asp:BoundColumn DataField="TotalAmount" HeaderText="Total Amount" SortExpression="TotalAmount" />
                            <asp:BoundColumn DataField="OrderStatus" HeaderText="Order Status" SortExpression="OrderStatus" />
                            <asp:TemplateColumn HeaderText="Status">
                                <ItemTemplate>
                                    <asp:DropDownList runat="server" ID="ddlStatus" OnSelectedIndexChanged="ddlStatus_SelectedIndexChanged" AutoPostBack="true" 
                                        DataSourceID="sdsStatuses" DataTextField="OrderStatus" DataValueField="OrderStatusID" /> 
                                </ItemTemplate>
                            </asp:TemplateColumn>
                            <asp:BoundColumn DataField="OrderID" HeaderText="Order ID" SortExpression="OrderID" />
                            <asp:HyperLinkColumn Text="Files" DataNavigateUrlField="OrderID" DataNavigateUrlFormatString="~/Files/{0}" />
                        </Columns>
                    </asp:DataGrid>

这是触发 ItemDataBound 事件时调用的代码：

protected void dgPartnerApprovalPending_ItemDataBound(object sender, DataGridItemEventArgs e)
    {
        ListItemType itemType = (ListItemType)e.Item.ItemType;           

        if (itemType == ListItemType.Item || itemType == ListItemType.AlternatingItem)
        {
            DataRowView view = (DataRowView)e.Item.DataItem;
            string OrderID = view["OrderID"].ToString();

            for (int i = 0; i <= 6; i++)
            {
                e.Item.Cells[i].Attributes.Add("OnClick", "window.location.href='PartnerApprovalDetail.aspx?oid="
                + OrderID
                + "'"
                );
            }
        }
    }

简而言之，ItemDataBound 事件使每一行都可点击，并将用户重定向到不同的页面。添加此事件处理程序并加载页面后，每当我单击任何行中的 DropDownList 时，页面都会变为空白。如果我在调试器中执行此操作，则永远不会触发 SelectedIndexChanged 事件。在使行可单击后，我尝试将数据绑定到 OnItemDataBound 处理程序中的 DropDownList。我还尝试在 PostBack 之后将数据绑定到 PageLoad() 中的 DropDownList。两者都没有帮助。我该如何解决这个问题？

标签： c#asp.netdatagridevent-handling

Answer 1

您正在表格单元格中添加 onclick 事件处理程序，<td>并且下拉列表呈现在表格单元格内。因此，当您尝试单击下拉列表时，单击事件被父表格单元格级别定义的事件处理程序捕获，该事件处理程序将用户带走.

您可以创建一个新的模板列来呈现详细信息链接：

    <asp:TemplateColumn HeaderText="Status">
       <ItemTemplate>
          <asp:HyperLink ID="DetailsUrls" runat="server" href="PartnerApprovalDetail.aspx?oid=<%#Eval("OrderID")%>">Detail</asp:HyperLink>
      </ItemTemplate>
    </asp:TemplateColumn>