C# 如何在dropdown selected index change事件中查找中继器内的dropdown selected值？

您只需将事件处理程序中的

sender

参数强制转换为

DropDownList

。它总是事件的源头。因此无需使用

FindControl

：

protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    //DropDownList DropDownList1 = (DropDownList)sender;
    //string SelectedValue = DropDownList1.SelectedValue;
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        DropDownList ddldrop = (DropDownList)e.Item.FindControl("DropDownList1");
        int  value =Convert.ToInt32( ddldrop.SelectedValue);
        Supervisor sup = new Supervisor();
    if (value ==1 ) {
            sup.Status = "Accept";
            sup.Save();
        }
    }
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
    //Supervisor sup = new Supervisor();
    //sup.Status = "Accept";
    //sup.Save();
}

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在上一篇文章中已经为您提供了解决方案。请参考并试一试

protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    //DropDownList DropDownList1 = (DropDownList)sender;
    //string SelectedValue = DropDownList1.SelectedValue;
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        DropDownList ddldrop = (DropDownList)e.Item.FindControl("DropDownList1");
        int  value =Convert.ToInt32( ddldrop.SelectedValue);
        Supervisor sup = new Supervisor();
    if (value ==1 ) {
            sup.Status = "Accept";
            sup.Save();
        }
    }
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
    //Supervisor sup = new Supervisor();
    //sup.Status = "Accept";
    //sup.Save();
}

protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
   DropDownList ddl = (DropDownList) sender;
   string selectedValue = ddl.SelectedValue;
   // ...
}