Use arguments with a MouseEventHandler

Question

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!";
}

Santhosh N · Answer

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 -------------------------------------------------------------------------------------- Can you please Mark as Accepted as I see it solves your problem

Sven Nijs · Answer

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 N · Answer

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 Dharmadasa · Answer

Use following code. private void OverKnooppunt(object sender, MouseEventArgs e) { MapLayer obj = (MapLayer)sender; string kp = obj.Tag; knooppunt.Text = "8"; }

Sven Nijs · Answer

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 N · Answer

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 Nijs · Answer

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 N · Answer

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 Nijs · Answer

I added this to my program: myLayer.someproperty = kp_naam; But "someproperty" is red underlined...

Santhosh N · Answer

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!" ; }

Use arguments with a MouseEventHandler

Answers (10)