StrokeStyle astrokeStyle = new StrokeStyle(d2dFactory, new StrokeStyleProperties()
{
DashCap = CapStyle.Flat,
DashStyle = DashStyle.Solid,
LineJoin = LineJoin.Miter,
StartCap = CapStyle.Flat,
EndCap = CapStyle.Flat,
MiterLimit = 0,
DashOffset = 0
}, new float[0]);
This was missing:
region Using declarations
using SharpDX;
using SharpDX.Direct2D1;

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