Question

我在用户注册时将城市和城镇信息保存到用户表。我想要做的是：当用户进入用户个人资料编辑页面时，我希望有选择地看到城市和城镇的DropDownList，但同时我想为城市中的所有其他数据填写DropDownList和镇表。例如：当我注册时，我选择波特兰作为城市，我选择胡德河作为城镇。我希望这两个人成为一个选定的人，但我想在同一个下拉列表中列出所有其他城镇和城市。

这是我在用户表中获取城市和城镇信息的地方：

private void GetUserCityAndTown()
{
    if(Session["userid"] != null)
    {
        DataRow dr = function.GetDataRow("SELECT city.name, town.name FROM kullanici LEFT JOIN city on city.city_no = user.city LEFT JOIN town on town.town_no = user.town WHERE userid=" + Session["userid"].ToString());
        if (dr != null)
        {
            DrpDwnLstCity.Text = dr[0].ToString();
            DrpDwnLstTown.Text = dr[1].ToString();
        }
}

这是我从城市表中获取所有城市信息的地方：

private void GetCity()
{
    SqlConnection conn;
    SqlCommand comm;
    SqlDataReader reader;
    string connectionString = ConfigurationManager.ConnectionStrings["aytasarimConnectionString"].ConnectionString;
    conn = new SqlConnection(connectionString);
    comm = new SqlCommand("SELECT * FROM city", conn);
    try
    {
        conn.Open();
        reader = comm.ExecuteReader();
        DrpDwnLstCity.DataSource = reader;
        DrpDwnLstCity.DataValueField = "city_no";
        DrpDwnLstCity.DataTextField = "name";
        DrpDwnLstCity.DataBind();
        reader.Close();
    }
    catch
    {
        string message = "<script>alert('Error!');</script>";
        Response.Write(message);
    }
}

这就是我从城镇表中获取所有城镇信息的地方：

private void GetTown()
{
    SqlConnection conn;
    SqlCommand comm;
    SqlDataReader reader;
    string connectionString = ConfigurationManager.ConnectionStrings["aytasarimConnectionString"].ConnectionString;
    conn = new SqlConnection(connectionString);
    comm = new SqlCommand("SELECT * FROM town WHERE city_no='" + DrpDwnLstCity.SelectedValue + "'", conn);
    try
    {
        conn.Open();
        reader = comm.ExecuteReader();
        DrpDwnLstTown.DataSource = reader;
        DrpDwnLstTown.DataValueField = "town_no";
        DrpDwnLstTown.DataTextField = "name";
        DrpDwnLstTown.DataBind();
        reader.Close();
    }
    catch
    {
        string message = "<script>alert('Error!');</script>";
        Response.Write(message);
    }
}

protected void DrpDwnLstCity_SelectedIndexChanged(object sender, EventArgs e)
{
    GetTown();
}

我在哪里犯错误？我应该使用类似的东西来选择DropDownList：

DrpDwnLstCity.Items.FindByValue(dr["city_no"].ToString()).Selected = true;

选择性地将数据带到DropDownList并将所有其他数据带到Sametime

0 个答案: