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Returns the fill type.
Use this method to determine which kind of fill is currently applied to the object, such as solid, patterned, gradient, textured, picture, or group fill.
FillType Type { get; }
ReadOnly Property Type As FillType
IShape shape = worksheet.Shapes.AddShape(AutoShapeType.Rectangle, 20, 20, 100, 60);
IFillFormat fillFormat = shape.Fill;
fillFormat.Solid();
FillType fillType = fillFormat.Type;