在表單上的用戶控件之間進行交流

Question

當我的用戶控件父級為窗體時，我想通過按鈕單擊從另一個調用usercontrol函數/方法。

通知; 我加載並添加用戶控件：

//Controls enum holding names of all our user controls
public enum ControlsEnum
{
    SPLASH_CONTROL,
    MAIN_CONTROL,
    CATEGORY_CONTROL,
}
public partial class MainForm : Form
{
    //Dictionary that holds all our instantiated user controls.
    private IDictionary<ControlsEnum, Control> controls = new Dictionary<ControlsEnum, Control>();

    public MainForm()
    {
        InitializeComponent();
        //When the program runs for the first time, lets call the ShowControl method that
        //will show the first control
        ShowControl(ControlsEnum.SPLASH_CONTROL);
    }

    public void ShowControl(ControlsEnum ctrl)
    {
        Control new_ctrl = null;

        //If our dictionary already contains instance of
        if (controls.ContainsKey(ctrl))
        {
            new_ctrl = controls[ctrl];
        }
        else
        {
            new_ctrl = CreateControl(ctrl);
            controls[ctrl] = new_ctrl;
        }

        new_ctrl.Parent = this;
        new_ctrl.Dock = DockStyle.Fill;
        new_ctrl.BringToFront();
        new_ctrl.Show();
    }

    private Control CreateControl(ControlsEnum ctrl)
    {
        switch (ctrl)
        {
            case ControlsEnum.SPLASH_CONTROL:
                return new Splash_uc();
            case ControlsEnum.MAIN_CONTROL:
                return new Main_uc();
            case ControlsEnum.CATEGORY_CONTROL:
                return new Categoty_uc();
            default:
                return null;
        }
    }

並在Category_uc中：

private void btn_categorySave_Click(object sender, EventArgs e)
{
   // i want refresh datagridview and add new category to list by save in database
}

並在main_uc中：

private void datagridview_Refresh()
{
  //rebind datagridview datasource
  // i want call this function from "category_uc" when click on Save Button
}

請幫我！ TNX;

Answer 1

您可以將事件添加到控件中：

class Categoty_uc
{
  public event EventHandler ButtonClicked;

  protected OnButtonClicked()
  {
    var tmp = ButtonClicked;

    if(tmp != null)
    {
      tmp(this, EventArgs.Empty);
    }
  }

  private void btn_categorySave_Click(object sender, EventArgs e)
  {
    OnButtonClicked();
  }
}

然后以您的主要形式：

private Main_uc main_uc = null;

private Control CreateControl(ControlsEnum ctrl)
{
  Control ret = null;

  switch (ctrl)
  {
    case ControlsEnum.CATEGORY_CONTROL:
    {
      if(main_uc != null)
      {
        ret = new Categoty_uc();
        ((Categoty_uc)ret).ButtonClicked += (sender, e) => 
                          {main_uc.datagridview_Refresh();}
      }
      else
      {
        throw new Exception("Create Main_uc first!");
      }
    }
    break;
    case ControlsEnum.MAIN_CONTROL:
    {
      if(main_uc == null)
      {
        main_uc = new Main_uc();
      }
      ret = main_uc;
    }
  }

  return ret;
}