Question

过去两天我一直遇到以下问题。

我想编辑用户名“Peter Chew”从“Staff”到“Admin”的角色。但它没有从我的数据库填充数据到radiobuttonlist

这是我的数据库表：

这是我的radiobuttonlist：

我的代码：

namespace BookReservation.Staff
{
    public partial class EditStaff : System.Web.UI.Page
    {
        int id = 0;
        SqlConnection conn = null;
        SqlCommand cmd = null;
        string connectionString = null;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                SqlDataReader dr = null;

                connectionString = ConfigurationManager.ConnectionStrings["LeaveManagementCS"].ConnectionString;

                conn = new SqlConnection(connectionString);

                string sql = "SELECT * FROM Staff";

                try
                {
                    cmd = new SqlCommand(sql, conn);

                    conn.Open();

                    dr = cmd.ExecuteReader();

                    while (dr.Read())
                    {
                        ListItem item = new ListItem(dr["Title"].ToString(), dr["StaffId"].ToString());
                        ddlTitle.Items.Add(item);
                    }
                    dr.Close();
                }
                catch (Exception ex)
                {
                    lblOutput.Text = "Error Message:" + ex.Message;
                }
                finally
                {
                    if (conn != null)
                        conn.Close();
                }

                if (Request.Params["username"] != null)
                {
                    string username = Request.QueryString["username"];

                    sql = "SELECT * FROM Staff where Username=@username";

                    try
                    {
                        cmd = new SqlCommand(sql, conn);

                        cmd.Parameters.AddWithValue("@username", username);

                        conn.Open();

                        dr = cmd.ExecuteReader();

                        dr.Read();


                       lblIdOut.Text = dr["StaffId"].ToString();
                       tbUsername.Text = username.ToString();
                       tbPassword.Text = dr["Password"].ToString();
                       tbStaffName.Text = dr["StaffName"].ToString();
                       tbEmail.Text = dr["Email"].ToString();
                       tbPhone.Text = dr["PhoneNo"].ToString();


                       dr.Close();

                    }
                    catch (Exception ex)
                    {
                        lblOutput.Text = "Error Message: " + ex.Message;
                    }
                    finally
                    {
                        if (conn != null)
                            conn.Close();
                    }

                }
                else
                {
                    lblOutput.Text = "Error. There is no ID to retrieve from the DB.";
                }
            }
        }

        protected void btnSubmit_Click(object sender, EventArgs e)
        {
            lblMessage.Text = "";
            lblMessage.Text += "Username " + tbUsername.Text + "<br />";
            lblMessage.Text += "Password " + tbPassword.Text + "<br />";
            lblMessage.Text += "Staff Name " + tbPassword.Text + "<br />";
            lblMessage.Text += "Email " + tbEmail.Text + "<br />";
            lblMessage.Text += "Phone No " + tbPhone.Text + "<br />";
            lblMessage.Text += "Title " + ddlTitle.SelectedItem.Text + "<br />";
            lblMessage.Text += "Role " + rblRole.SelectedItem.Text + "<br />";

            connectionString = ConfigurationManager.ConnectionStrings["LeaveManagementCS"].ConnectionString;

            conn = new SqlConnection(connectionString);

            string sql = "UPDATE Staff SET Username=@user, Password=@Pwd, StaffName=@staff, Email=@email, PhoneNo=@phone, Title=@title, Role=@role ";
            sql += " WHERE StaffId=@id";

            string ddl = ddlTitle.SelectedItem.Text;
            string rbl = rblRole.SelectedItem.Text;

            try
            {
                cmd = new SqlCommand(sql, conn);

                cmd.Parameters.AddWithValue("@id", lblIdOut.Text);
                cmd.Parameters.AddWithValue("@user", tbUsername.Text);
                cmd.Parameters.AddWithValue("@Pwd", tbPassword.Text);
                cmd.Parameters.AddWithValue("@staff", tbStaffName.Text);
                cmd.Parameters.AddWithValue("@email", tbEmail.Text);
                cmd.Parameters.AddWithValue("@phone", tbPhone.Text);
                cmd.Parameters.AddWithValue("@title", ddl);
                cmd.Parameters.AddWithValue("@role", rbl);

                conn.Open();

                int rows = cmd.ExecuteNonQuery();

                if (rows > 0)
                {
                    lblOutput.Text = "Record update successfully";
                }
            }
            catch (Exception ex)
            {
                lblOutput.Text = "Error Message: " + ex.Message;
            }
            finally
            {
                if (conn != null)
                    conn.Close();
            }

        }
    }
}

Answer 1

要根据当前数据库值设置RadioButtonList的初始值，请在Page.Reoad（）中将此行添加到dr.Read（）和dr.Close（）之间（您要设置其他控件的值）：

rblRole.SelectedValue = dr["Role"].ToString();

要根据所选的RadioButtonList项更新数据库值，请从以下位置更改此行：

string rbl = rblRole.SelectedItem.Text;

到此：

string rbl = rblRole.SelectedItem.Value;

SelectedItem.Text属性获取所选项目的可见文本（＆＃34; Admin＆＃34;或＆＃34; Staff＆＃34;），这是用于向用户显示所选项目的内容。但是，对于数据库条目，您需要所选项目的隐藏值（＆＃34; A＆＃34;或＆＃34; S＆＃34;），这些值可通过SelectedItem.Value（或SelectedValue）属性访问。 / p>

如何从我的数据库填充RadioButtonList

1 个答案: