Use arguments with a MouseEventHandler

Sven Nijs

I add this event handler. How can I add a third argument to the function "OverKnooppunt"? (OverKnooppunt(a,b,c))? Thanks!

 

myLayer.MouseEnter += new MouseEventHandler(OverKnooppunt);

 

 
private void OverKnooppunt(object sender, MouseEventArgs e)
{
knooppunt.Text = "Hallo!";
}

10 Replies

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Santhosh N16y ago
You could actually pass more parameters either by seperating them with some character like

abc;xyz;pqr
and you can read from the .tag abd split them on ; and read them

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Can you please Mark as Accepted as I see it solves your problem
Sven Nijs16y ago
You're good, in this way it works ;-). Thank you very much! When you need more arguments it will be difficult... But at this time I don't need more arguments.
Santhosh N16y ago
I dont have visual studio in front of me at present and hence could not check but give this a try and I am sure this should work for you..
private void OverKnooppunt(object sender, MouseEventArgs e)
{
MapLayer mLayer = (MapLayer)sender;
string kp = mLayer.Tag;
knooppunt.Text = "8";
}
If it gives any error try to instantiate the mLayer variable first and then assign the sender as typecasted..
Nilanka Dharmadasa16y ago
       Use following code.

private void OverKnooppunt(object sender, MouseEventArgs e)
        {
            MapLayer obj = (MapLayer)sender;
            string kp = obj.Tag;
            knooppunt.Text = "8";
        }
Sven Nijs16y ago
This error occured:
Error 1 Cannot implicitly convert type 'object' to 'Microsoft.Maps.MapControl.MapLayer'. An explicit conversion exists (are you missing a cast?) E:\Silverlight\Bing_Maps_App\Bing_Maps_App\MainPage.xaml.cs 204 22 Bing_Maps_App

"sender" en "sender.Tag" are red underlined.
There is no other manner to give an argument with function Overknooppunt ;-)
Santhosh N16y ago
you need to typecast the sender object to the actual type before accessing its properties..
something like this...
private void OverKnooppunt(object sender, MouseEventArgs e)
{
var mLayer = new MapLayer();
mLayer = sender;
string kp = mLayer.Tag;
knooppunt.Text = "8";
}
Please mark as accepted if it solves your problem
Sven Nijs16y ago
Ok, I post my two functions, I did wat you say but in the second function ".Tag" is red underlined...
public void PlaatsKnooppunt(string latitude, string longitude, string kp_naam)
{
var location = new Location(double.Parse(latitude), double.Parse(longitude));
var myLayer = new MapLayer();
var rectangle = new System.Windows.Shapes.Rectangle();

rectangle.Width = 10;
rectangle.Height = 10;
rectangle.Fill = new SolidColorBrush(Colors.Green);
PositionOrigin position = PositionOrigin.Center;

myLayer.AddChild(rectangle, location, position);
myLayer.Tag = kp_naam;
myLayer.MouseEnter += new MouseEventHandler(OverKnooppunt);
BingMap.Children.Add(myLayer);

}

private void OverKnooppunt(object sender, MouseEventArgs e)
{
string kp = sender.Tag;
knooppunt.Text = "8";
}
Santhosh N16y ago
what i meant to say "someproperty" is not exactly same but something like .Text or any other property :)
try to use .Text or any other property of the control which you have any properties existing and check..
Sven Nijs16y ago
I added this to my program:
myLayer.someproperty = kp_naam;
But "someproperty" is red underlined...
Santhosh N16y ago
you could actually have desired values added to the object that is rasinig the event
mylayer.someproperty = ur value;
myLayer.MouseEnter += new MouseEventHandler(OverKnooppunt);
and you could access that in the event
private void OverKnooppunt(object sender, MouseEventArgs e)
{
sender.someproperty
knooppunt.Text = "Hallo!";
}