如何将我的列表框项目传递到我的组合框

Question

大家晚上好！我正在寻求帮助，我有一个问题..当我从列表框中删除数据时，如何在组合框中再次传递数据？ 首先

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    if(comboBox1.Text == "withTax")
    {
        listBox1.Items.Add(comboBox1.Text);
        withtax.Text = "Yes";
        comboBox1.Items.Remove(comboBox1.Text);
    }
    else if (comboBox1.Text == "SSS")
    {
        listBox1.Items.Add(comboBox1.Text);
        SSS.Text = "Yes";
        comboBox1.Items.Remove(comboBox1.Text);
    }
    else if (comboBox1.Text == "PhilHealth")
    {
        listBox1.Items.Add(comboBox1.Text);
        PhilHealth.Text = "Yes";
        comboBox1.Items.Remove(comboBox1.Text);
    }
    else if (comboBox1.Text == "Pag-Ibig")
    {
        listBox1.Items.Add(comboBox1.Text);
        Pagibig.Text = "Yes";
        comboBox1.Items.Remove(comboBox1.Text);
    }
}
private void button1_Click(object sender, EventArgs e)
{
    for (int i = listBox1.SelectedItems.Count -1; i>=0; i--)
    {
        listBox1.Items.Remove(listBox1.SelectedItems[i]);
        comboBox1.Items.Add(listBox1.Items.ToString());
    }            
}

Answer 1

切换这两行

constructor(props) {
    super(props);
    this._didFocusSubscription = props.navigation.addListener('didFocus', payload =>
      BackHandler.addEventListener('hardwareBackPress', this.onBackButtonPressAndroid)
    );
  }

  componentDidMount() {
    this._willBlurSubscription = this.props.navigation.addListener('willBlur', payload =>
      BackHandler.removeEventListener('hardwareBackPress', this.onBackButtonPressAndroid)
    );
  }

  onBackButtonPressAndroid = () => {
BackHandler.exitApp();
return true;
}

像这样

listBox1.Items.Remove(listBox1.SelectedItems[i]);
comboBox1.Items.Add(listBox1.Items.ToString());

在第一行中，您已将其从列表框项中删除，然后您将无法使用它，则应以这种方式进行切换。

并更改此

comboBox1.Items.Add(listBox1.Items.ToString());
listBox1.Items.Remove(listBox1.SelectedItems[i]);

对此

comboBox1.Items.Add(listBox1.Items.ToString());