动态生成菜单项

Question

I have a database row with a primary key index and strUsername and I'm using these to dynamically generate dropdown items in a menu strip. The code gives the dropdown item the username string as it's text value and creates an event handler. I want to pass the primary key integer to the click event method but the code I've got gives all the click event methods the database row.count value. Can anyone help please?

//  Generate drop down items from database

daUsers.Fill(dtUsers);

// Update mnuFileNew drop down list
if (dtUsers.Rows.Count != 0)
{
    mnuFileNew.DropDownItems.Clear();

    foreach (dbAutoBloggerDataSet.dbTblUsersRow row in dtUsers.Rows)
    {
        ToolStripMenuItem newItem = new ToolStripMenuItem(row.strUsername);
        newItem.Click += new EventHandler((sender, e) => mnuFileNewUser_Click(sender, e, row.nId));
        mnuFileNew.DropDownItems.Add(newItem);
    }
}

//  Drop down item event handler
private void mnuFileNewUser_Click(object sender, EventArgs e, int nId)
{
    frmLogin frmLogin = new frmLogin(nId);
    DialogResult result = frmLogin.ShowDialog();
    if (result == DialogResult.OK)
    {
        frmProfile frmProfile = new frmProfile(frmLogin.nId);
        frmProfile.ShowDialog();
        screenRefresh();
    }
}

Answer 1

I think this sample code is useful

void AddMenuItem(string text, string action)
{
   ToolStripMenuItem item = new ToolStripMenuItem();
   item.Text = text;
   item.Click += new EventHandler(item_Click);
   item.Tag = action;

   //first option, inserts at the top
   //historyMenu.Items.Add(item);

   //second option, should insert at the end
   historyMenuItem.DropDownItems.Insert(historyMenuItem.DropDownItems.Count, item);
}

private void someHistoryMenuItem_Click(object sender, EventArgs e)
{
   ToolStripMenuItem menuItem = sender as ToolStripMenuItem;

   string args = menuItem.Tag.ToString();

   YourSpecialAction(args);
}