PropertyGrid doesn't notice properties changed in code?

Question

I have a Winform application which uses colour to highlight certain things. I would like to allow the users to change \'their\' colours. As an exercise, I thought I would cr

Answer 1

Just try refreshing it:

private void button1_Click(object sender, EventArgs e)
{
  Colours colours = this.propertyGrid1.SelectedObject as Colours;
  colours.Reset();
  this.propertyGrid1.Refresh();
}

Assuming you will have more properties, you can use your PropertyChanged event. I would modify your Colour class like this:

public class Colours : INotifyPropertyChanged {
  public event PropertyChangedEventHandler PropertyChanged;

  private Color _ColourP1;

  public void Reset() {
    this.ColourP1 = Color.Red;
  }

  private void OnChanged(string propName) {
    if (PropertyChanged != null)
      PropertyChanged(this, new PropertyChangedEventArgs(propName));
  }

  public Color ColourP1 {
    get { return _ColourP1; }
    set {
      _ColourP1 = value;
      OnChanged("ColourP1");
    }
  }
}

Then your form would look like this:

public Form1() {
  InitializeComponent();

  Colours colours = new Colours();
  colours.PropertyChanged += colours_PropertyChanged;
  this.propertyGrid1.SelectedObject = colours;
}

private void colours_PropertyChanged(object sender, PropertyChangedEventArgs e) {
  this.propertyGrid1.Refresh();
}

private void button1_Click(object sender, EventArgs e) {
  ((Colours)this.propertyGrid1.SelectedObject).Reset();
}