C#+AE 二次开发 打断相交的线

 //参数:IFeature类型的List ，IPoint类型的mapPoint
 private void splitFeature(List featureList, IPoint mapPoint)
        {
            if (featureList == null)
            {
                return;
            }
            if (mapPoint.X == 0 && mapPoint.Y == 0 && mapPoint.IsEmpty)
            {
                return;
            }
            IFeature nowFeature = (IFeature)null;
            IFeatureEdit featureEdit = (IFeatureEdit)null;
            for (int i = 0; i < featureList.Count; i++)
            {
                try
                {
                    nowFeature = featureList[i];
                    featureEdit = nowFeature as IFeatureEdit;
	    this.featureSplitSet = featureEdit.Split((IGeometry)mapPoint);
               
                    int flag= -1;
                    for (int index = 0;  index < this.pmc.Map.LayerCount; ++ index)
                    {
                        if (this.pmc.Map.get_Layer( index).Name == "点")
                        {
                            flag =  index;
                            break;
                        }
                    }
                    if flag> -1)
                    {
                        IFeatureLayer featureLayer = this.pmc.Map.get_Layer(flag) as IFeatureLayer;
                        IFeature feature1 = this.featureSplitSet.Next() as IFeature;
                        IFeature feature2 = this.featureSplitSet.Next() as IFeature;
                        IPolyline shape1 = feature1.Shape as IPolyline;
                        IPolyline shape2 = nowFeature.Shape as IPolyline;
                        if (shape1.FromPoint.X == shape2.FromPoint.X && shape1.FromPoint.Y == shape2.FromPoint.Y)
                        {
                            IFeature feature3 = featureLayer.FeatureClass.CreateFeature();
                            IPoint point = (IPoint)new PointClass();
                            if (i == 1)
                            {
                                point.X = mapPoint.X;
                                point.Y = mapPoint.Y;
                                feature3.Shape = (IGeometry)point;
                            }
                            feature3.Store();
                            ((IFeatureClassWrite)featureLayer.FeatureClass).WriteFeature(feature3);
                        }
                        else if (shape1.ToPoint.X == shape2.ToPoint.X && shape1.ToPoint.Y == shape2.ToPoint.Y)
                        {
                            IFeature feature3 = featureLayer.FeatureClass.CreateFeature();
                            IPoint point = (IPoint)new PointClass();
                            if (i == 1)
                            {
                                point.X = mapPoint.X;
                                point.Y = mapPoint.Y;
                                feature3.Shape = (IGeometry)point;
                            }
                            feature3.Store();
                            ((IFeatureClassWrite)featureLayer.FeatureClass).WriteFeature(feature3);
                        }
                        feature1.Store();
                        feature2.Store();
                    }

                }
                catch
                {
                    return;
                }
            }
        }