topic Re: Labeling Features dynamically? in ArcGIS API for Silverlight Questions

Labeling Features dynamically?

UlfGrimhardt — Fri, 01 Apr 2011 05:49:05 GMT

Hi

I have an Silverlight App with lots of Point Features in my map. Now i would like to be able to label some of the features (selected by query) dynamically with some attributes. I dont want to use the Tooltip, instead each Point should be labeld with a specific Text. The Problem is, that i dont want to label attributes from the FeatureClass but Values from a SQLServer Database. Is that possible?

I use ArcGIS Server 9.3.1.

Thanks in advance!

Re: Labeling Features dynamically?

JenniferNery — Fri, 01 Apr 2011 14:15:20 GMT

Can you use a TextSymbol or a MarkerSymbol with TextBlock to display the attribute value?

Re: Labeling Features dynamically?

UlfGrimhardt — Wed, 06 Apr 2011 04:51:16 GMT

I tried that but if i use TextSymbols in my FeatureLayer, i couldnt get different Attributes for each Point in my map. I always got the same Symbol for every Point.

I dont know how to tell the FeatureLayer that it gets different Values for each Point.

Re: Labeling Features dynamically?

DominiqueBroux — Sat, 11 Dec 2021 11:54:47 GMT

You can either create one symbol by graphic (this thread may be helpful)
or you can bind the Text property to the attribute so you need only one symbol for all graphics:

 
<Grid.Resources>
<esriSymbols:TextSymbol x:Key="LegendTextSymbol">
                <esriSymbols:TextSymbol.ControlTemplate>
                    <ControlTemplate>
                        <Border Padding="10,5,10,5" Background="White" BorderBrush="Black">
                            <TextBlock 
                                FontSize="{Binding Symbol.Size}" 
                                Text="{Binding Attributes[NameOfTheAttributeUsedForLabeling]}" 
                                Foreground="Blue"
                                FontFamily="{Binding Symbol.FontFamily}"
                                HorizontalAlignment="Center" />
                        </Border>
                    </ControlTemplate>
                </esriSymbols:TextSymbol.ControlTemplate>
            </esriSymbols:TextSymbol>
</Grid.Resources>

Re: Labeling Features dynamically?

UlfGrimhardt — Thu, 07 Apr 2011 05:50:38 GMT

Is this possible with Attributes which i get from a SQLServer Database and not Attributes of an FeatureClass?

Re: Labeling Features dynamically?

DominiqueBroux — Thu, 07 Apr 2011 07:10:55 GMT

This is possible as soon as you symbolize graphics having theirs attributes populated.
THe attributes can come from a SQL server database.

Re: Labeling Features dynamically?

UlfGrimhardt — Mon, 11 Apr 2011 06:10:22 GMT

What exactly is meant by "populated attributes". I really have Problems getting this to work,....

Re: Labeling Features dynamically?

DominiqueBroux — Mon, 11 Apr 2011 06:42:38 GMT

How are you creating your graphics objects?

If you are using a FeatureLayer, the attributes will be populated automatically as soon as you set the OutFields property.

If you are creating the graphics by yourself, you have to populate the Attributes dictionary by code.

Re: Labeling Features dynamically?

UlfGrimhardt — Sat, 11 Dec 2021 11:54:50 GMT

Hi

I create a FeatureLayer by Code and by using the WHERE Clause i add Graphics to it

            l = new FeatureLayer();
            l.OutFields.Add("NHN"); 
            l.ID = "MyFeatureLayer";
            l.FeatureSymbol = TS;
            l.Url = "http://testestest";

l.Where = "Pointnumber"
                testmap.Layers.Add(l);

Another way i use is the results of Find and Identify-Tasks.
In my SQL Server Database i have a Field called "NHN" and "Pointnumber".
In my FeatureClass i also have the field "Pointnumber". Using the Pointnumber-Fields i get the Connection between SQL and FeatureClass.