Dynamic Objects

Question

Just curious as to how to modify a dynamic variable after creation.

I figure, I could just store them into some sort of list.

But I do assign them a name and event and wanted to know when the event is triggered would it be possible to modify the item with its name ?(object sender)

Edit Clarification:

On run time create new items and associate them with events.

Image img = new Image();
img.name = "Image" + someIntValue;
img.MouseDown += new MouseButtonEventHandler(selectedImageClick);
someGrid.Children.add(img);
void selectedImageClick(object sender, MouseButtonEventArgs e)
{
   //Modify that image e.g: border      
}

Can you clarify your question with perhaps a code sample?

Tejs
– Tejs

2011-03-29 16:29:53 +00:00
Commented Mar 29, 2011 at 16:29 — Tejs
– Tejs, Commented Mar 29, 2011 at 16:29
@Tejs, hope this clarifies things.

Reza M.
– Reza M.

2011-03-29 16:49:02 +00:00
Commented Mar 29, 2011 at 16:49 — Reza M.
– Reza M., Commented Mar 29, 2011 at 16:49

drovani · Accepted Answer · 2011-03-29 16:51:10Z

2

In order to modify the sender, you'll have to cast it. Your event handler would then look something like this:

void selectedImageClick(object sender, MouseButtonEventArgs e)
{
    Image img = sender as Image;
    if (img != null)  // In case someone calls this event handler with something other than an Image
    {
        //Modify that image e.g: border
    }
}

answered Mar 29, 2011 at 16:51

drovani

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2 Comments

Reza M. Over a year ago

Thanks, I figured as much, anyway for the object to be multiple types ?

drovani Over a year ago

Well, you could do some run-time reflection to get the type of the object and check to see if it implements the method/property you are trying to affect. Alternatively, you could use a nest of if/else's. Third, and this is probably what you really want, is that you can test for a base type. You may actually want to affect properties that are implemented by the Control class. I would caution sending more than one or two types to a single Event Handler as it can start to become a twisted mess of conditional statements, making it harder to debug in the future.

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