Add additional string parameter into DispatcherTimer EventHandler

Question

How can I add extra string parameter into Dispatchertimer Eventhandler ?.

I would like achieve something like this:

string ObjectName = "SomeObjectName";
System.Windows.Threading.DispatcherTimer dispatcherTimer = new System.Windows.Threading.DispatcherTimer();
dispatcherTimer.Tick += new EventHandler(dispatcherTimer_Tick(ObjectName));

And function:

private void dispatcherTimer_Tick(object sender, EventArgs e, string ObjectName)
{
    [...]
}

How Can I achieve that?

Edit:

My intention is add some animation for moving object. I've got canvas with few objects. I can move this objects on canvas by mouse clicking, i would like to add animations for this movement.

Answer 1

You can use a closure for that:

... 
{    
    string objectName = "SomeObjectName";
    var dispatcherTimer = new DispatcherTimer();

    dispatcherTimer.Tick += (sender, e) => { myTick(sender, e, objectName); };
}

private void myTick(object sender, EventArgs e, string objectName)
{
    [...]
}

---

Note, though, that the variable objectName is captured, rather than it's current value. That means if you do this:

... 
{    
    string objectName = "SomeObjectName";
    var dispatcherTimer = new DispatcherTimer();

    dispatcherTimer.Tick += (sender, e) => { myTick(sender, e, objectName); };
    objectName = "SomeOtherObjectName";
}

myTick will be called with SomeOtherObjectName , which might be counter-intuitive at a first glance. The reason for this is that, under the hood, a separate object instance with an objectName field is created -- very similar to what Chris' solution is doing explicitly.

Answer 2

You can use this trick to pass along as much data as you'd like:

class Foo
{
    public string PropertyA { get; set; }
    public string PropertyB { get; set; }
    // ...

    public void OnTick( object sender, EventArgs e )
    {
        // logic here
    }
}

var f = new Foo() { PropertyA = "some stuff here",
                    PropertyB = "some more stuff here" };
dispatcherTimer.Tick += f.OnTick;

Obviously, if you only ever have one event handler for the same timer you could just as well store the required data in whatever class is using this.