C# 在c中调用时，手动初始化的combobox不会显示

我刚刚创建了一个包含许多组合框的表单，但它们只使用相同的数据。第一次，我每次点击radiobutton都会加载数据，但这需要一些时间，而且非常烦人。因此，我希望在应用程序启动时只加载一次组合框，而不是每次单击单选按钮时都加载组合框

下面的代码是创建全局组合框，它可以在表单中的任何位置调用

    public partial class Form1 : Form
    {
       //code to get the requester below
       public List<XMLSoccerCOM.Team> all_team = requester.GetAllTeams();
       public List<XMLSoccerCOM.League> all_league = requester.GetAllLeagues();

       public ComboBox combo_team = new ComboBox();   //global combo_team
       public ComboBox combo_league = new ComboBox();  //global combo_league

       //the rest of the code
    }

看起来已经完成了，我只需要随时分配它。在radiobutton checkchange事件中，我将其设置为：

    private void history_league_CheckedChanged(object sender, EventArgs e)
    {
        his_combobox = combo_league;   // Assign the global league combobox to a local combobox.

        his_odds_label.Text = "Choose the league:"; //This label is next to the his_combobox
        his_odds_label.Visible = true;
        his_combobox.Visible = true;   //Show them if it's hidden by another radiobutton

    }

    private void history_team_CheckedChanged(object sender, EventArgs e)
    {
        his_combobox = combo_team;   // Assign the global team combobox to a local combobox.

        his_odds_label.Text = "Choose the team:"; //This label is next to the his_combobox
        his_odds_label.Visible = true;
        his_combobox.Visible = true;   //Show them if it's hidden by another radiobutton

    }

但当我按住Ctrl+F5键时，它不会显示，只有标签显示，his_组合框不会显示，就像它永远不会出现一样

---

请随时询问更多信息。谢谢您的时间。

分配数据源非常重要

his_combobox.DataSource=combo_league.DataSource

但我会用更简单的方法来做类似的事情

private void checkBox1_CheckedChanged(object sender, EventArgs e)
    {
        var checkbox = (CheckBox) sender;
        comboBox1.DataSource = checkbox.Checked ? all_team : all_league;
        comboBox1.Visible = true;
    }

通过这种方法，您不必创建额外的组合框，但这取决于您的需要

编辑： 在我的示例中，我将all_team和all_league作为字符串类型，但您可以根据自己的属性进行调整

public List<String> all_team = new List<string>
    {
        "Team A",
        "Team B"
    };

    public List<String> all_league = new List<string>
    {
        "League a",
        "League b"
    };

    public ComboBox combo_team = new ComboBox();   //global combo_team
    public ComboBox combo_league = new ComboBox();  //global combo_league

    public Form1()
    {
        InitializeComponent();
        comboBox1.Visible = false;

    }

    /// <summary>
    /// Method 1
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void checkBox1_CheckedChanged(object sender, EventArgs e)
    {
        var checkbox = (CheckBox) sender;
        comboBox1.DataSource = checkbox.Checked ? all_team : all_league;
        comboBox1.Visible = true;
    }

    /// <summary>
    /// Method2
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void checkBox2_CheckedChanged(object sender, EventArgs e)
    {
        combo_league.DataSource = all_league;
        combo_team.DataSource = all_team;
        var checkbox = (CheckBox)sender;

        comboBox1.DataSource = checkbox.Checked?combo_league.DataSource:combo_team.DataSource;
        comboBox1.Visible = true;

    }

---

最后我从Kalyan那里得到了一些建议。我创建了一个全局变量：

 public List<String> teams = new List<string>();

最后，让团队成为数据源：

   combobox1.DataSource = teams;

---

仅此而已：谢谢。

看看这里，也许会有帮助：|我不知道怎么了，但这些对我不起作用。第一种方法给我一个空的组合框，第二种较短的方法给我一个这种类型的组合框，比如XMLSoccerCOM.Team或XMLSoccerCOM.league如何只添加一列作为数据源？有什么建议吗？@tranhoi:您是否尝试添加显示成员和值成员，这些值应该是您的属性。检查这个网址谢谢，我从你的理想答复中找到了我的答案。

    foreach (XMLSoccerCOM.Team te in all_team)
        {
            teams.Add(te.Name.ToString());
        }

   combobox1.DataSource = teams;