修改键的代码

Question

 public partial class editbyview : Form
    {
        List<Friend> friends = new List<Friend>();
        public editbyview()
        {
            InitializeComponent();
            dataclass fd = new dataclass();
            friends = fd.SelectAll();
        }
       
        private void editbyview_Load(object sender, EventArgs e)
        {
            cmb2.DataSource = friends;
            cmb2.DisplayMember = "sName";
            cmb2.ValueMember = "iID";
            cmb2.SelectedIndex = 0;
        }              private void cmb2_SelectedIndexChanged(object sender, EventArgs e)
        {
            string id = cmb2.SelectedIndex.ToString();
            
            foreach(Friend f in friends)
            {
                if (f.iID ==Convert.ToInt32(id))
                {
                    txtid.Text = f.iID.ToString();
                    txtname.Text = f.sName;
                    txttel.Text = f.sTel;
                    txtmob.Text = f.sMob;
                    txtdanwei.Text = f.sDanwei;
                    txtadress.Text = f.sAdress;
                    txtqq.Text = f.sQQ;
                    txtemail.Text = f.sEmail;                     
                }
            }
        }        private void btnEdit_Click(object sender, EventArgs e)
        {
          这里应该写什么代码！！！！        }

Answer 1

要什么功能，修改并保存吗？新建Friend 类，然后给每一个属性赋值，然后连接数据库保存即可