将数据从UserControl传递到另一个

Question

I have a form and two custom UserControl that I made myself. one control has some buttons that each of these button have theire Tag property set to an array of PointF . I have another UserControl that has a ObservableCollection<PointF[]> that I set its event handler to draw the lines if data is being added to it. This works fine If I put the data points on its own class...just make to sure it works.

No my problem is, having this two control in one form, how can I set the click event of buttons in the first control, to add data points to the second control?

This two controls are both in two different projects in my soloution. and the form that these to controls are being showed in, is also in a different project (it is the launching project of soloution)

Answer 1

You could add a public method on the second usercontrol that receive an array of PointF, then inside this method you could add the PointF to your collection.

EDIT: To handle the click event inside the first user control

inside the first usercontrol add the event and the delegate required

public delegate void OnClickPointDataEvent(object sender, PointF[] data);
public event OnClickPointDataEvent ClickPointData;

then form_load event subscribe to the usercontrol1 event

uc1.ClickPointData += new UserControl1.OnClickPointDataEvent(form_subscribe_event);

private void form_subscribe_event(object sender, PointF[] data)
{
    uc2.SomePublicMethod(data);
}

and finally, inside the first usercontrol button click call the code that handle the event inside the form

....
if(ClickPointData != null)
    ClickPointData(pointf_array);
...

Answer 2

Add an event to the first control.

public event EventHandler<EventArgs> Control1ButtonClicked;
private void OnClicked()
{
    var handler = Control1ButtonClicked;
    if (handler != null)
    {
        handler(this, new EventArgs());
    }
}

private void Button1_Click(object sender, EventArgs e)
{
    OnClicked();     
}

Add a property to the second control

public ObservableCollection<PointF[]> MyPoints{ get; set;};

Then in your main application add a listener

userControl1.Control1ButtonClicked += new EventHandler<EventArgs>(userControl1_Control1ButtonClicked);

void userControl1_Control1ButtonClicked()
{
    //Do Something to control 2
    userControl2.MyPoints.Add() = //Whatever
}