Constructs a UniqueValue object.
Syntax
| Visual Basic (Declaration) | |
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Public Function New() |
| Visual Basic (Usage) |  Copy Code |
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Dim instance As UniqueValue()
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Example
The following example displays capital and non-capital cities with different
symbols: larger star and smaller circle. A ValueMapRenderer is created, and two
UniqueValue objects are created, one for capitals and one for non-capitals. These
are added to the renderer, and the renderer is assigned to the existing cities
layer.
| Visual Basic | Copy Code |
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Dim valueMapRend As New ValueMapRenderer()
valueMapRend.ValueField = "CAPITAL"
valueMapRend.DefaultLabel = "Other"
valueMapRend.DefaultSymbol = New SimpleMarkerSymbol(Drawing.Color.Gray, 5)
Dim uniqueValue As UniqueValue
uniqueValue = New UniqueValue()
uniqueValue.Value = "Y"
uniquevalue.ComparisonMethod = ComparisonMethod.IsExact
uniqueValue.SymbolLabel = "Capital"
uniqueValue.Symbol = New SimpleMarkerSymbol(Drawing.Color.OrangeRed, 20, MarkerSymbolType.Star)
valueMapRend.Values.Add(uniqueValue)
uniqueValue = New UniqueValue()
uniqueValue.Value = "N"
uniqueValue.SymbolLabel = "Non-capital"
uniqueValue.Symbol = New SimpleMarkerSymbol(Drawing.Color.Gray, 10)
valueMapRend.Values.Add(uniqueValue)
Dim layer As FeatureLayer = mapView.Layers.FindByName("Cities")
layer.Renderer = valueMapRend
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| C# | Copy Code |
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// Create a new ValueMapRenderer and set value field
ValueMapRenderer valueMapRend = new ValueMapRenderer();
valueMapRend.ValueField = "CAPITAL";
// Ranges below should cover all population sizes, but just in case we miss any...
valueMapRend.DefaultLabel = "Other";
valueMapRend.DefaultSymbol = new SimpleMarkerSymbol(Drawing.Color.Gray, 5);
UniqueValue uniqueValue;
// Create unique values for capitals and non-capitals
uniqueValue = new UniqueValue();
uniqueValue.Value = "Y";
uniquevalue.ComparisonMethod = ComparisonMethod.IsExact;
uniqueValue.SymbolLabel = "Capital";
uniqueValue.Symbol = new SimpleMarkerSymbol(Drawing.Color.OrangeRed, 20, MarkerSymbolType.Star);
valueMapRend.Values.Add(uniqueValue);
uniqueValue = new UniqueValue();
uniqueValue.Value = "N";
uniqueValue.SymbolLabel = "Non-capital";
uniqueValue.Symbol = new SimpleMarkerSymbol(Drawing.Color.Gray, 10);
valueMapRend.Values.Add(uniqueValue);
// Assign the ValueMapRenderer to an existing point layer
FeatureLayer layer = mapView.Layers.FindByName("Cities");
layer.Renderer = valueMapRend;
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See Also
