public override bool HasM {get; set;}

// Use a builder convenience method or use a builder constructor.

MapPoint point1 = null;

// Builder constructors need to run on the MCT.
ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  using (MapPointBuilder mb = new MapPointBuilder(1.0, 2.0, 3.0))
  {
    bool bhasZ = mb.HasZ;          // hasZ = true
    bool bhasM = mb.HasM;          // hasM = false
    bool bhasID = mb.HasID;        // hasID = false

    // do something with the builder

    point1 = mb.ToGeometry();
  }
});

double x = point1.X;                  // x = 1.0
double y = point1.Y;                  // y = 2.0
double z = point1.Z;                  // z = 3.0
double m = point1.M;                  // m = Nan
int ID = point1.ID;                   // ID = 0
bool hasZ = point1.HasZ;              // hasZ = true
bool hasM = point1.HasM;              // hasM = false
bool hasID = point1.HasID;            // hasID = false
bool isEmpty = point1.IsEmpty;        // isEmpty = false

// Builder convenience methods don't need to run on the MCT.
MapPoint point2 = MapPointBuilder.CreateMapPoint(point1);
x = point2.X;                   // x = 1.0
y = point2.Y;                   // y = 2.0
z = point2.Z;                   // z = 3.0
m = point2.M;                   // m = Nan
hasZ = point2.HasZ;           // hasZ = true
hasM = point2.HasM;           // hasM = false
hasID = point2.HasID;         // hasID = false

// list of points
List<MapPoint> points = new List<MapPoint>
{
  MapPointBuilder.CreateMapPoint(0, 0, 2, 3, 1),
  MapPointBuilder.CreateMapPoint(1, 1, 5, 6),
  MapPointBuilder.CreateMapPoint(2, 1, 6),
  MapPointBuilder.CreateMapPoint(0, 0)
};

// will have attributes because it is created with convenience method
Polyline polylineWithAttrs = PolylineBuilder.CreatePolyline(points);

bool hasZ = polylineWithAttrs.HasZ;          // hasZ = true
bool hasM = polylineWithAttrs.HasM;          // hasM = true
bool hasID = polylineWithAttrs.HasID;        // hasID = true

// will have attributes because it is created with convenience method
Polygon polygonWithAttrs = PolygonBuilder.CreatePolygon(points);
hasZ = polygonWithAttrs.HasZ;               // hasZ = true
hasM = polygonWithAttrs.HasM;               // hasM = true
hasID = polygonWithAttrs.HasID;             // hasID = true

// Builder constructors need to run on the MCT.
ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  // will not have attributes because it is passed something other than an attributed polyline
  using (PolylineBuilder polylineB = new PolylineBuilder(points))
  {
    hasZ = polylineB.HasZ;                      // hasZ = false
    hasM = polylineB.HasM;                      // hasM = false
    hasID = polylineB.HasID;                    // hasID = false
  }

  // will have attributes because it is passed an attributed polyline
  using (PolylineBuilder polylineB = new PolylineBuilder(polylineWithAttrs))
  {
    hasZ = polylineB.HasZ;                      // hasZ = true
    hasM = polylineB.HasM;                      // hasM = true
    hasID = polylineB.HasID;                    // hasID = true
  }

  // will not have attributes because it is passed something other than an attributed polygon
  using (PolygonBuilder polygonB = new PolygonBuilder(points))
  {
    hasZ = polygonB.HasZ;                       // hasZ = false
    hasM = polygonB.HasM;                       // hasM = false
    hasID = polygonB.HasID;                     // hasID = false
  }

  // will have attributes because it is passed an attributed polygon
  using (PolygonBuilder polygonB = new PolygonBuilder(polygonWithAttrs))
  {
    hasZ = polygonB.HasZ;                       // hasZ = true
    hasM = polygonB.HasM;                       // hasM = true
    hasID = polygonB.HasID;                     // hasID = true
  }
});