触发 SelectedIndexChanged 事件 ASP.NET

Question

我在 GridView 中有一个 DropDownList。我想对 SelectedIndexChanged 内的数据库进行一些更新，它没有被触发。

PS：我尝试了我在互联网上找到的所有解决方案，但总是出现同样的问题。

代码如下：

<asp:TemplateField HeaderText="Accepté" ControlStyle-Width="90px">
       <ItemTemplate >
            <asp:Label ID="lblState" runat="server" Text='<%# Eval("StateCode") %>' Visible = "False" />
            <asp:DropDownList ID="ddlState" runat="server" Visible = "False" OnSelectedIndexChanged="ddlState_SelectedIndexChanged">
            </asp:DropDownList>
       </ItemTemplate>
</asp:TemplateField >

以及背后的代码

protected void grwConsent_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        if (e.Row.Cells[0].Text != " ")
        {

            DropDownList ddlState = e.Row.FindControl("ddlState") as DropDownList;
            if (null != ddlState)
            {
                ddlState.Visible = true;
                string stateValue = (e.Row.FindControl("lblState") as Label).Text;

                ConsentHelper.LoadConsentStatesInList(ddlState,"-----",stateValue);

                ddlState.Items.RemoveAt(0);
                ddlState.Items.FindByText(stateValue).Selected = true;
            }
        }
    }

}

protected void ddlState_SelectedIndexChanged(object sender, EventArgs e)
{
    //Database Updates
}

谢谢！

Answer 1

尝试将这些属性添加到您的 DropDownList：

• ViewStateMode="Enabled"
• EnableViewState="true"
• AutoPostBack="true"

---

<asp:DropDownList ID="ddlState" AutoPostBack="true" EnableViewState="true"
    ViewStateMode="Enabled" runat="server" ...