如何通过单击按钮从GridView中的多个DropDown列表中获取值？

Question

我的asp.net webform上有一个GridView，后面用C＃代码创建了所有列和行。除第一列外，每列中的每个单元格都是DropDownList，其中DataSource。

这是我的GridView：

 <asp:GridView ID="gv_Rota" runat="server" AutoGenerateColumns="false" OnRowDataBound="gv_Rota_RowDataBound">
                     <HeaderStyle BackColor="#6a3d98" ForeColor="White" Height="20" />
                     <RowStyle HorizontalAlign="Center" Height="20px" Width="100px" />
                     <AlternatingRowStyle Height="20px" />
                 </asp:GridView>

列和单元格的c＃创建：

 private void BindGrid(int Amount)
    {
        gv_Rota.DataSource = null;
        gv_Rota.Columns.Clear();

        BoundField bfield = new BoundField();
        bfield.HeaderText = "Days";
        bfield.DataField = "Days";
        gv_Rota.Columns.Add(bfield);

        for (int i = 0; i < Amount; i++)
        {
            int week = i + 1;
            string sWeek = "Week " + week.ToString();

            TemplateField tfield = new TemplateField();
            tfield.HeaderText = sWeek;
            gv_Rota.Columns.Add(tfield);
        }

        DataTable dt = new DataTable();
        dt.Columns.Add(new DataColumn("Days", typeof(string)));
        dt.Rows.Add("M");
        dt.Rows.Add("T");
        dt.Rows.Add("W");
        dt.Rows.Add("T");
        dt.Rows.Add("F");
        dt.Rows.Add("S");
        dt.Rows.Add("S");
        gv_Rota.DataSource = dt;
        gv_Rota.DataBind();
    }

然后在我RowDataBound的{​​{1}}触发器上，我将GridView控件添加到每个单元格中：

DropDownList

例如在我的页面上显示的内容：

所以我的问题和问题是我现在想要将每个列（第一个除外）保存到数据库，作为＆＃34;计划周＆＃34;，并且不知道如何获取所选项的值在所有或任何protected void gv_Rota_RowDataBound(object sender, GridViewRowEventArgs e) { for (int i = 1; i <= ColumnCount; i++) { if (e.Row.RowType == DataControlRowType.DataRow) { ddlShift = new DropDownList(); ddlShift.ID = "ddlShift"; ddlShift.DataSource = DCListOfShifts; ddlShift.DataValueField = "SHIFT_ID"; ddlShift.DataTextField = "SHIFT_NAME"; ddlShift.DataBind(); ddlShift.Items.Insert(0, new ListItem("Shift...")); ddlShift.CssClass = "ddl_rotamanager"; e.Row.Cells[i].Controls.Add(ddlShift); } } } 中，然后将其传递回数据库。 请注意，这不是DropDownLists。我将从所有selectedindexchanged中选择项目，然后按一个按钮提交值。请有人给我一些关于如何做到这一点的重点介绍？感谢。

编辑1：响应说明了如何在一行或单个单元格中获取DropDownList的每个值。但是，现在我需要更具体地了解如何获取列中的特定单元格的值而不是行。是否有可能进一步突出这一点？

Answer 1

使用Gridview.Rows属性

protected void MyButton_Click(object sender, EventArgs e)
{
    foreach(GridViewRow row in gv_Rota.Rows)
    {
       //find this control in this row
       DropDownList dd = row.FindControl("MyDropdown") as DropDownList;

       //OR
       //find this control in a specific cell
       DropDownList day = row.Cells[0].FindControl("MyDropdown") as DropDownList;
       DropDownList Week1 = row.Cells[1].FindControl("ddShift") as DropDownList;

       //this is just a pseudo-code to determine which dropdown was selected per row. 
       //You can improve on this
       if(dd1.SelectedValue != string.Empty)
         thisDay.SelectedWeek = dd1.SelectedValue;
       else if(dd2.SelectedValue != string.Empty)
         thisDay.SelectedWeek = dd2.SelectedValue;
       ....
    }
}