分配Gridview DropDownList值

<asp:GridView ID="GridView1" runat="server">
    <Columns>
        <asp:TemplateField HeaderText="下拉列表列">
            <ItemTemplate>
                <asp:DropDownList ID="DropDownList1" runat="server"></asp:DropDownList>
            </ItemTemplate>
        </asp:TemplateField>
        <!-- 其他列 -->
    </Columns>
</asp:GridView>

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        // 绑定下拉列表数据源
        DropDownList DropDownList1 = GridView1.FindControl("DropDownList1") as DropDownList;
        DropDownList1.DataSource = GetDropDownListData(); // 获取下拉列表数据源的方法
        DropDownList1.DataTextField = "Text"; // 下拉列表项的文本字段
        DropDownList1.DataValueField = "Value"; // 下拉列表项的值字段
        DropDownList1.DataBind();
    }
}

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        DropDownList DropDownList1 = e.Row.FindControl("DropDownList1") as DropDownList;
        string selectedValue = (e.Row.DataItem as DataRowView)["ColumnName"].ToString(); // 获取该行数据中用于选中的值的字段名
        DropDownList1.SelectedValue = selectedValue;
    }
}