WPF: Compare two brushes using IsEquals

Introduction 

Code to compare two brushes using IsEquals in WPF.

Using the code

public static bool IsEqual(Brush aBrush1, Brush aBrush2)
{
    if (aBrush1.GetType() != aBrush2.GetType())
        return false;
    else
    {
        if (aBrush1 is SolidColorBrush)
        {
            return (aBrush1 as SolidColorBrush).Color == 
              (aBrush2 as SolidColorBrush).Color && 
              (aBrush1 as SolidColorBrush).Opacity == (aBrush2 as SolidColorBrush).Opacity;
        }
        else if (aBrush1 is LinearGradientBrush)
        {
            bool result = true;
            result = (aBrush1 as LinearGradientBrush).ColorInterpolationMode == 
              (aBrush2 as LinearGradientBrush).ColorInterpolationMode && result;
            result = (aBrush1 as LinearGradientBrush).EndPoint == 
              (aBrush2 as LinearGradientBrush).EndPoint && result;
            result = (aBrush1 as LinearGradientBrush).MappingMode == 
              (aBrush2 as LinearGradientBrush).MappingMode && result;
            result = (aBrush1 as LinearGradientBrush).Opacity == 
              (aBrush2 as LinearGradientBrush).Opacity && result;
            result = (aBrush1 as LinearGradientBrush).StartPoint == 
              (aBrush2 as LinearGradientBrush).StartPoint && result;
            result = (aBrush1 as LinearGradientBrush).SpreadMethod == 
              (aBrush2 as LinearGradientBrush).SpreadMethod && result;
            result = (aBrush1 as LinearGradientBrush).GradientStops.Count == 
              (aBrush2 as LinearGradientBrush).GradientStops.Count && result;
            if (result && (aBrush1 as LinearGradientBrush).GradientStops.Count == 
                      (aBrush2 as LinearGradientBrush).GradientStops.Count)
            {
                for (int i = 0; i < (aBrush1 as LinearGradientBrush).GradientStops.Count; i++)
                {
                    result = (aBrush1 as LinearGradientBrush).GradientStops[i].Color == 
                      (aBrush2 as LinearGradientBrush).GradientStops[i].Color && result;
                    result = (aBrush1 as LinearGradientBrush).GradientStops[i].Offset == 
                      (aBrush2 as LinearGradientBrush).GradientStops[i].Offset && result;
                    if (!result)
                        return result;
                }
            }
            return result;
        }
        else if (aBrush1 is RadialGradientBrush)
        {
            bool result = true;
            result = (aBrush1 as RadialGradientBrush).ColorInterpolationMode == 
                         (aBrush2 as RadialGradientBrush).ColorInterpolationMode && result;
            result = (aBrush1 as RadialGradientBrush).GradientOrigin == 
                        (aBrush2 as RadialGradientBrush).GradientOrigin && result;
            result = (aBrush1 as RadialGradientBrush).MappingMode == (aBrush2 as RadialGradientBrush).MappingMode && result;
            result = (aBrush1 as RadialGradientBrush).Opacity == (aBrush2 as RadialGradientBrush).Opacity && result;
            result = (aBrush1 as RadialGradientBrush).RadiusX == (aBrush2 as RadialGradientBrush).RadiusX && result;
            result = (aBrush1 as RadialGradientBrush).RadiusY == (aBrush2 as RadialGradientBrush).RadiusY && result;
            result = (aBrush1 as RadialGradientBrush).SpreadMethod == (aBrush2 as RadialGradientBrush).SpreadMethod && result;
            result = (aBrush1 as RadialGradientBrush).GradientStops.Count == (aBrush2 as RadialGradientBrush).GradientStops.Count && result;
            if (result && (aBrush1 as RadialGradientBrush).GradientStops.Count == (aBrush2 as RadialGradientBrush).GradientStops.Count)
            {
                for (int i = 0; i < (aBrush1 as RadialGradientBrush).GradientStops.Count; i++)
                {
                    result = (aBrush1 as RadialGradientBrush).GradientStops[i].Color == 
                                  (aBrush2 as RadialGradientBrush).GradientStops[i].Color && result;
                    result = (aBrush1 as RadialGradientBrush).GradientStops[i].Offset == 
                                      (aBrush2 as RadialGradientBrush).GradientStops[i].Offset && result;
                    if (!result)
                        return result;
                }
            }
            return result;
        }
        else if (aBrush1 is ImageBrush)
        {
            bool result = true;
            result = (aBrush1 as ImageBrush).AlignmentX == (aBrush2 as ImageBrush).AlignmentX && result;
            result = (aBrush1 as ImageBrush).AlignmentY == (aBrush2 as ImageBrush).AlignmentY && result;
            result = (aBrush1 as ImageBrush).Opacity == (aBrush2 as ImageBrush).Opacity && result;
            result = (aBrush1 as ImageBrush).Stretch == (aBrush2 as ImageBrush).Stretch && result;
            result = (aBrush1 as ImageBrush).TileMode == (aBrush2 as ImageBrush).TileMode && result;
            result = (aBrush1 as ImageBrush).Viewbox == (aBrush2 as ImageBrush).Viewbox && result;
            result = (aBrush1 as ImageBrush).ViewboxUnits == (aBrush2 as ImageBrush).ViewboxUnits && result;
            result = (aBrush1 as ImageBrush).Viewport == (aBrush2 as ImageBrush).Viewport && result;
            result = (aBrush1 as ImageBrush).ViewportUnits == (aBrush2 as ImageBrush).ViewportUnits && result;

            result = (aBrush1 as ImageBrush).ImageSource == (aBrush2 as ImageBrush).ImageSource && result;
            return result;
        }
    }
    return false;
}