static void Main()
 {
     Application.EnableVisualStyles();
     Application.SetCompatibleTextRenderingDefault(false);
     SqliteHelper.InitDBFile(out string msg);
     if (!string.IsNullOrEmpty(msg))
     {
         MessageBox.Show(msg, "提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
         return;
     }
     using (UserLogin dialog = new UserLogin(false))
     {
         if (dialog.ShowDialog() == DialogResult.OK)
         {
             Application.Run(new MainForm(dialog.User));
         }
         else
         {
             SqliteHelper.CloseDBFile();
             return;
         }
     }
     SqliteHelper.CloseDBFile();
 }