Trying to create a simple line symbol. But getting an error: "The type 'ESRI.ArcGIS.Display.RgbColorClass' has no constructors defined"

public override void OnClick()
        IDocument pdoc = m_application.Document;
        IMxDocument pmxdoc = (IMxDocument)pdoc;
        IActiveView pactive = pmxdoc.ActiveView;
        IRgbColor rgbColorCls = new RgbColorClass();
        rgbColorCls.Red = 138;
        rgbColorCls.Green = 151;
        rgbColorCls.Blue = 255;
        ISimpleLineSymbol simpleLineSymbol = new SimpleLineSymbol();
        simpleLineSymbol.Color = rgbColorCls;            
  • I don't program in c# so may be what I am suggesting is incorrect but in VB I would not have put () after RgbColorClass.
    – Hornbydd
    May 4, 2016 at 13:59
  • 2
    Your syntax is correct according to the Create RGBColor Snippet
    – kenbuja
    May 4, 2016 at 15:38

1 Answer 1


Got this fixed. For those facing similar issue: expand the "References", find the ESRI.ArcGIS.Display reference. Right click it and select properties, and change "Embed Interop Types" to false.

  • 1
    Yep, that's a trap for young players... this one did my head in for a few days. This is on the borderline between GIS.SE and StackOverflow as it's a Visual Studio build problem and not an ArcObjects issue. While it's here though it's worth a +1, no doubt someone else will have the same problem and search this site. May 6, 2016 at 5:38
  • Thanks - I had this problem when debugging some existing project and had to adopt the code to run against a different version of ArcMap - then I got all these weird errors when I did a clone of the project from Git. This helped alleviate the head scratching!!
    – Vidar
    May 23, 2018 at 9:35

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