Error when assigning ClassBreaksRenderer to BiUniqueValueRenderer

BarbaraSchneider1

I am creating a BiUniqueValueRenderer:

IBivariateRenderer bivariateRenderer = new BiUniqueValueRendererClass();

// Assign renderers it to biunique value renderer     

bivariateRenderer.MainRenderer = (IFeatureRenderer)uniqueValueRend;

bivariateRenderer.VariationRenderer = (IFeatureRenderer)classBreaksRend;

When I'm assigning the classBreaksRend to the bivariateRenderer, there is following error message: "Value is outside expected range".

I have assigned both the uniqueValueRenderer and the ClassBreaksRenderer separately to the layer, and both work fine.

Here is the code for creating the ClassBreaksRenderer:

IClassBreaksRenderer classBreaksRend = new ClassBreaksRenderer();

// Define the table histogram

ITableHistogram tableHistogram = (ITableHistogram) new TableHistogram();

tableHistogram.Field = fieldName;

tableHistogram.Table = (ITable)featLayer;

IHistogram histogram = (IHistogram) tableHistogram;

object doubleArrayValues;

object longArrayFequencies;

histogram.GetHistogram(out doubleArrayValues, out longArrayFequencies);

// Set up classification method

IClassifyGEN classifyGen = new EqualInterval();

classifyGen.Classify(doubleArrayValues, longArrayFrequencies, ref numClasses);

double[] classBreaks = (double[]) classifyGen.ClassBreaks;

// Set renderer properties

classBreaksRend.Field = fieldName;

classBreaksRend.FieldCount = numClasses;

classBreaksRend.MinimumBreak = classBreaks[0];

// Interpolate marker sizes

List<double> markerSizes = InterpolateMarkerSizes(numClasses, markerSymbol.Size, maxSymbolSize);

// Step through breaks and assign breaks, labels, and symbols

for (int i = 0; i < numClasses; i++)

{

   classBreaksRend.set_Break(i, classBreaks[i+1]);

   classBreaksRend.set_Label(i, classBreaks + " - " + classBreaks[i + 1]);

   markerSymbol.Size = markerSizes;

   classBreaksRend.set_Symbol(i, (ISymbol)markerSymbol);

}

Any help is appreciated!

BarbaraSchneider1

Hi Yuan,

the symbol types match: I'm using Simple Marker Symbols for both the UniqueValueRenderer and the ClassBreaksRenderer.

I have manually set these two renderers in ArcMap and it works.