UniqueValueRenderer change polygon fill color dynamically

[xariaD]

How to change the fill color of a particular polygon at runtime?

[xariaD]

Did you set the OutFields property on the FeatureLayer?

Yeah I missed that.

[xariaD]

But I still don't understand how to dynamically apply the renderer.
The status of all graphic when the map is loaded is 0.
The status changes after the application starts.
So when I set the graphic.Attributes["status"] to newstatus value, it is not rendered.
How to refresh renderer or apply new renderer?

[DominiqueBroux]

It should be automatic when you change the value of an attribute which is used in the renderer.

How looks your renderer which is using the attribute 'status'?

[xariaD]

 <esriSymbols:SimpleFillSymbol x:Key="MyYellowFillSymbol" Fill="YellowGreen" BorderBrush="Transparent" BorderThickness="2" />
            <esriSymbols:SimpleFillSymbol x:Key="MyRedFillSymbol" Fill="Red" BorderBrush="Transparent" BorderThickness="2" />
            <esri:UniqueValueRenderer x:Key="MyUniqueValueRenderer" Attribute="Status" >
                <esri:UniqueValueRenderer.Infos>
                    <esri:UniqueValueInfo Value="Off" Symbol="{StaticResource MyRedFillSymbol}" />
                    <esri:UniqueValueInfo Value="On" Symbol="{StaticResource MyYellowFillSymbol}"/>                    
                </esri:UniqueValueRenderer.Infos>
            </esri:UniqueValueRenderer>

And the feature layer is

<esri:FeatureLayer ID="towers" Url="http://MyMapURL/MapServer/0"
       Where="1=1" Renderer="{StaticResource MyUniqueValueRenderer}"
        MouseLeftButtonDown="FeatureLayer_MouseLeftButtonDown">
 <esri:FeatureLayer.OutFields>
         <sys:String>RefName</sys:String>
         <sys:String>Status</sys:String>
         <sys:String>Text</sys:String>
 </esri:FeatureLayer.OutFields>
</esri:FeatureLayer>

[DominiqueBroux]

So when I set the graphic.Attributes["status"] to newstatus value, it is not rendered.

<esri:UniqueValueRenderer x:Key="MyUniqueValueRenderer" Attribute="Status" >

Looks like you are using status in code and Status in XAML.
Attribute names are case sensitive.

[xariaD]

NOoooooooooooooooooooooooooo

I know it is case-sensitive, and I am using "Status" in code behind.

[DominiqueBroux]

Might be that the status is initialized with coded values such as 0 and 1   and your renderer is using strings "On"/"Off".

[xariaD]

No, that is not the case either.
The status is defined as String "On"/"Off" and I am assigning the same in code behind.
😞

[xariaD]

 private void FeatureLayer_MouseLeftButtonDown(object sender, GraphicMouseButtonEventArgs e)
        {
            Graphic feature = e.Graphic;          
            feature.Attributes["Status"] = "On";
        }

This is what I have in code behind.
What to do??

[DominiqueBroux]

I tested with your code and I didn't get any problem.
So I don't understand:confused:

I guess you have verified that your event handler 'FeatureLayer_MouseLeftButtonDown' is executed?

Which ArcGIS SL API version are you using?