private void button4_Click_1(object sender, EventArgs e) { comboBox1.Items.Clear(); comboBox2.Items.Clear(); comboBox4.Items.Clear(); comboBox5.Items.Clear(); comboBox6.Items.Clear(); for (int i = 0; i < grp1.Get_City_Num(); i++) { comboBox1.Items.Add(grp1.IDToName(i)); comboBox2.Items.Add(grp1.IDToName(i)); } if (grp1.Get_City_Num() > 0) { comboBox1.Text = grp1.IDToName(0); comboBox2.Text = grp1.IDToName(0); comboBox3.Text = "飞碟"; } Init_Time_Menu(); }