C# combobox options dependent on another combobox

问题

I am working on a program in which a combobox's options are dependent on another combobox's selected option. The selected item from the first combobox chooses which options are in the second combobox. Does anyone know how to do this?

This is the button that adds the information to the first combobox

    try
        {
            CustomerAccount aCustomerAccount = new CustomerAccount(txtAccountNumber.Text, txtCustomerName.Text,
            txtCustomerAddress.Text, txtPhoneNumber.Text);
            account.Add(aCustomerAccount);

            cboClients.Items.Add(aCustomerAccount.GetCustomerName());
            ClearText();
        }
        catch (Exception)
        {
            MessageBox.Show("Make sure every text box is filled in!", "Error", MessageBoxButtons.OK);
        }

And here is the selectedIndex for the first combobox.

 private void cboClients_SelectedIndexChanged(object sender, EventArgs e)
    {

        CustomerAccount custAccount = account[cboClients.SelectedIndex] as CustomerAccount;
        if (custAccount != null)
        {
            txtAccountNumberTab2.Text = custAccount.GetAccountNumber();
            txtCustomerNameTab2.Text = custAccount.GetCustomerName();
            txtCustomerAddressTab2.Text = custAccount.GetCustomerAddress();
            txtCustomerPhoneNumberTab2.Text = custAccount.GetCustomerPhoneNo();
        }
    }

回答1:

Add a SelectedIndexChanged event handler for the first ComboBox. Use it to clear the content of the second ComboBox and populate it with the related items:

public Form1()
  {
    InitializeComponent();
    for(int i = 0; i < 10; i++) {
        comboBox1.Items.Add(String.Format("Item {0}", i.ToString()));
    }
    comboBox1.SelectedIndex = 0;
  }

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
  {
    comboBox2.Items.Clear();
    for (int i = 0; i < 5; i++)
    {
      comboBox2.Items.Add(String.Format("Item_{0}_{1}", 
                          comboBox1.SelectedItem, i.ToString()));
    }
    comboBox2.SelectedIndex = 0;
  }

来源：https://stackoverflow.com/questions/10239392/c-sharp-combobox-options-dependent-on-another-combobox

标签

combobox