using System;
using System.Data;
using System.ComponentModel;
using System.Windows.Forms;
using System.Diagnostics;

namespace BindingListChanged
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }

    BindingList<Person> personen = new BindingList<Person>();
    BindingSource bs;

    private void Form1_Load(object sender, EventArgs e)
    {
      FülleDaten(personen);
      bs = new BindingSource();
      bs.DataSource = personen; dgv.DataSource = bs;
      bs.CurrentItemChanged +=new EventHandler(bs_CurrentItemChanged);
      dgv.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.AllCells;
      dgv.Columns["PrivatAnschrift"].ReadOnly = true;
      textBox1.DataBindings.Add("Text", bs, "Name");
      textBox2.DataBindings.Add("Text", bs, "Alter");
      textBox3.DataBindings.Add("Text", bs, "PrivatAnschrift.Strasse");
      foreach (Control tb in tlPanel1.Controls)
        if (tb is TextBox)
          tb.TextChanged += new EventHandler(tb_TextChanged);
    }

    int counter = 0;
    void tb_TextChanged(object sender, EventArgs e)
    {
      ZeigeEreignis("TextChanged");
      if (MitResetCurrentItem())
        bs.ResetCurrentItem(); // <<-- Workaround, wenn ohne INotifyPropertyChanged

            }

    private bool MitResetCurrentItem()
    {
      return !chkReset.Checked;
    }

    void bs_CurrentItemChanged(object sender, EventArgs e)
    {
      ZeigeEreignis("CurrentItemChanged");
    }

    private void ZeigeEreignis(string ereignis)
    {
      txtInfos.AppendText(String.Format("{0}:{1}\r\n", counter++,ereignis));
      txtInfos.ScrollToCaret();
    }

    private void FülleDaten(BindingList<Person> personen)
    {
      personen.Add(new Person(42, "Alpha", new Anschrift("A Strasse 1")));
      personen.Add(new Person(21, "Beta", new Anschrift("B Strasse 2")));
      personen.Add(new Person(53, "Gamma", new Anschrift("G Strasse 3")));
      personen.Add(new Person(19, "Delta", new Anschrift("D Strasse 4")));
    }

    class Person : INotifyPropertyChanged
    {
      public Person(int alter, string Name, Anschrift privatAnschrift)
      {
        this.Alter = alter;
        this.name = Name;
        this.privatAnschrift = privatAnschrift;
        this.privatAnschrift.PropertyChanged += new PropertyChangedEventHandler(privatAnschrift_PropertyChanged);
      }

      void privatAnschrift_PropertyChanged(object sender, PropertyChangedEventArgs e)
      {
        NotifyPropertyChanged("PrivatAnschrift");
      }

      private int alter;
      public int Alter
      {
        get { return alter; }
        set { alter = value; }
      }

      private string name;
      public string Name
      {
        get { return name; }
        set { name = value; }
      }

      private Anschrift privatAnschrift;
      public Anschrift PrivatAnschrift
      {
        get { return privatAnschrift; }
        set
        {
          privatAnschrift = value;
          NotifyPropertyChanged("PrivatAnschrift");
        }
      }

      public event PropertyChangedEventHandler PropertyChanged;
      private void NotifyPropertyChanged(String info)
      {
        if (PropertyChanged != null)
          PropertyChanged(this, new PropertyChangedEventArgs(info));
      }
   }

    class Anschrift : INotifyPropertyChanged
    {
      public Anschrift(string strasse)
      {
        this.strasse = strasse;
      }

      private string strasse;
      public string Strasse
      {
        get { return strasse; }
        set
        {
          strasse = value;
          NotifyPropertyChanged("Strasse");
        }
      }

      public override string ToString()
      {
        return strasse;
      }

      public event PropertyChangedEventHandler PropertyChanged;
      private void NotifyPropertyChanged(String info)
      {
        if (PropertyChanged != null)
          PropertyChanged(this, new PropertyChangedEventArgs(info));
      }
    }

    private void chkReset_CheckedChanged(object sender, EventArgs e)
    {
      chkReset.Text = (chkReset.Checked ? "Ohne" : "Mit") + " ResetCurrentItem";
    }
  }
}