Question

我有一个带DataGrid的ASP.Net 4.6.1网页。在DataGrid内部，在TemplateColumn中，我有一个DropDownList。 DropDownList具有一个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，直到我向DataGrid添加一个OnItemDataBound事件处理程序：

<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事件使每一行都可单击，并将用户重定向到另一个页面。添加此事件处理程序并加载页面后，每当我单击任意行中的DropDownList时，页面将变为空白。如果我在调试器中执行此操作，则永远不会触发SelectedIndexChanged事件。在使行可单击之后，我尝试将数据绑定到OnItemDataBound处理程序中的DropDownList。我还尝试了在PostBack之后将数据绑定到PageLoad（）中的DropDownList。都没有帮助。我该如何解决？

Answer 1

您要在表单元格<td>上添加onclick事件处理程序，并且下拉列表将呈现在表单元格内。因此，当您尝试单击下拉列表时，click事件会被父级定义的事件处理程序捕获。表格单元格级别，使用户感到迷惑。

您可以创建一个新的模板列以呈现“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>

DataGrid OnItemDataBound干扰了DropDownList OnSelectedIndexChange事件

1 个答案: