嘗試在GridView中填充下拉列表

Question

單擊網格視圖上的編輯時，我有以下代碼嘗試填充下拉列表，它給我以下錯誤：

" 'ddlgvRoom' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value"

關於我為什么需要在行編輯事件中添加代碼的任何想法，如果可以，您可以提供幫助嗎？ 我的gridview從objectdatasource獲取其值。

    protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow &&
            (e.Row.RowState & DataControlRowState.Edit) == DataControlRowState.Edit)
        {
            DropDownList dl = (DropDownList)e.Row.FindControl("ddlgvRoom");
        }
    }

    protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        DropDownList ddlgvRoom = (DropDownList)GridView1.Rows[e.RowIndex].FindControl("ddlgvRoom");
        string strgvRoom = ddlgvRoom.SelectedItem.Text.ToString();

        DropDownList ddlgvJack = (DropDownList)
            GridView1.Rows[e.RowIndex].FindControl("ddlgvJack");
        string strgvJack = ddlgvJack.SelectedItem.Text.ToString();

        DropDownList ddlgvVlan = (DropDownList)
            GridView1.Rows[e.RowIndex].FindControl("ddlgvVlan");
        string strgvVlan = ddlgvVlan.SelectedItem.Text.ToString();
        GridView1.DataBind();

    }
}

Answer 1

必須脫掉HTML端的selectedvalue，一切都開始起作用