topic Maptip Multiple Field Binding in ArcGIS API for Silverlight Questions

Maptip Multiple Field Binding

DanielSanders — Wed, 25 May 2011 15:55:10 GMT

I would like to format city, state, and zip (separate out fields) and display them in a maptip. It's possible to create separate text blocks with bindings for each field and then put them in a horizontal stackpanel, but it seems like there should be an easier way. I tried using a converter, but the object passed to the Convert method is of type ESRI.ArcGIS.Client.Graphics.ObservableDictionary and I can't figure out how to cast it correctly to get the values out. What is the best way to do this?

Thanks...

Re: Maptip Multiple Field Binding

DominiqueBroux — Sat, 11 Dec 2021 19:19:17 GMT

The datacontext of the maptip is set to the Attributes property of the current graphic.
Attributes is an ObservableDictionary, so if you bind to the datacontext itself (i.e. {Binding} without path) you get the Observable dictionary.
If you use a converter, this converter will get this dictionary as input, so you can use it to generate the string you want.
By supposing your attributes are called "City" and "State":

 
public object Convert(object value, .....)
{
  ObservableDictionary dict = value as ObservableDictionary;
  return format.String("City = {0}  State =  {1}", dict["City"], dict["State"]);
}

Re: Maptip Multiple Field Binding

DanielSanders — Wed, 25 May 2011 18:26:49 GMT

Thanks for you reply. This line gives an error:
ObservableDictionary dict = value as ObservableDictionary;

I think I'm missing a reference. Do you know what assembly ObservableDictionary is in?

Thanks

Re: Maptip Multiple Field Binding

DominiqueBroux — Sat, 11 Dec 2021 19:19:19 GMT

Sorry my mistake. Observable Dictionary is not public:confused:

Attributes is declared as 'IDictionary<string, object>'

so the code should be:

 
public object Convert(object value, .....)
{
  var dict = value as IDictionary<string, object>;
  return format.String("City = {0}  State =  {1}", dict["City"].ToString(), dict["State"].ToString());
}

Sorry for the confusion.

Re: Maptip Multiple Field Binding

DanielSanders — Thu, 26 May 2011 16:59:16 GMT

Awesome. That works. Thanks for your help!