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Returns the fill pattern.
Use this method to retrieve the PatternType applied to the shape's fill after the fill has been configured as a pattern fill.
PatternType Pattern { get; }
ReadOnly Property Pattern As PatternType
IShape shape = worksheet.Shapes.AddShape(AutoShapeType.Rectangle, 20, 20, 100, 60);
IFillFormat fillFormat = shape.Fill;
fillFormat.Patterned(PatternType.Percent10);
PatternType pattern = fillFormat.Pattern;