下拉事件未触发

Question

我在网格的HeaderTemplate中有一个DropdownLIst 我在此下拉列表的selectedINdexChanged事件上写了一些服务器端代码 但是这个事件永远不会发生。 我还启用了ViewState的下拉菜单和Page为true Ant ide必须是什么问题

Answer 1

我已经在我的环境中解决了这个问题....请查看以下代码..

这是我在aspx页面中的gridview。

 <asp:GridView ID="grvGrid" runat="server" AllowPaging="True"   
            AllowSorting="True" AutoGenerateColumns="False" DataKeyNames="CustomerID" OnRowDataBound="grvGrid_RowDataBound">  
            <Columns>  
                <asp:BoundField DataField="CustomerID" HeaderText="CustomerID" ReadOnly="True"   
                    SortExpression="CustomerID" />  
                <asp:BoundField DataField="CompanyName" HeaderText="CompanyName"   
                    SortExpression="CompanyName" />  
               <asp:TemplateField>
                    <HeaderTemplate>
                        <%--<asp:Label ID="lblMon1" runat="server"></asp:Label>--%>
                        <asp:DropDownList id="ddlMon" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlMon_SelecdtedIndexChanges">
                            <asp:ListItem Text="1" Value="1" Selected="True">1</asp:ListItem>
                            <asp:ListItem Text="2" Value="2">2</asp:ListItem>
                            <asp:ListItem Text="3" Value="3">3</asp:ListItem>
                        </asp:DropDownList>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <asp:Label ID="lblblbl" runat="server"></asp:Label>
                    </ItemTemplate>
               </asp:TemplateField>
            </Columns>  
        </asp:GridView> 

获取网格视图在页面加载事件中绑定

protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            GetTable();
            grvGrid.DataSource = dstable;
            grvGrid.DataBind();
        }
    }

查找DropDown控件并绑定它的事件

protected void grvGrid_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (Page.IsPostBack)
        {
            if (e.Row.RowType == DataControlRowType.Header)
            {
                DropDownList ddlmon = e.Row.FindControl("ddlMon") as DropDownList;
                ddlmon.SelectedIndexChanged += new EventHandler(ddlMon_SelecdtedIndexChanges);
            }
        }
    }

DropDown SelectedIndex更改事件

protected void ddlMon_SelecdtedIndexChanges(object sender, EventArgs e)
    {
        // Your Code paste here
    }

Answer 2

此处可能出现的问题是DropDownList可能未设置属性

AutoPostBack="true" try add this to your `DropDownList`