1   public void LineSplit(IFeature feature, IGeometry other)
  2         {
  3             try
  4             {
  5                 ITopologicalOperator shape = feature.Shape as ITopologicalOperator;
  6                 IPoint point = new PointClass();
  7                 IGeometry geometry2 = shape.Intersect(other, esriGeometryDimension.esriGeometry0Dimension);
  8                 if (!geometry2.IsEmpty)
  9                 {
 10                     IPointCollection points2 = geometry2 as IPointCollection;
 11                     for(int i = 0; i < points2.PointCount; i++)
 12                     {
 13                         point = points2.get_Point(i);
 14                         ISet set = (feature as IFeatureEdit).Split(point);
 15                         set.Reset();
 16                         for (IFeature feature2 = set.Next() as IFeature; feature2 != null; feature2 = set.Next() as IFeature)
 17                         {
 18                             if (!IsSplitOk(feature2,other))
 19                             {
 20                                 feature = feature2;
 21                             }
 22                             else
 23                             {
 24                                 ISimpleLineSymbol symbol = new SimpleLineSymbolClass();
 25                                 IRgbColor color = new RgbColorClass
 26                                 {
 27                                     RGB = Color.FromArgb(0xff, 0, 0).ToArgb()
 28                                 };
 29                                 symbol.Color = color;
 30                                 symbol.Width = 2.0;
 31                                 this.pMapControl.FlashShape(feature2.Shape, 1, 450, symbol as ISymbol);
 32                                 pMapControl.ActiveView.FocusMap.SelectFeature(pCurrentLayer, feature2);
 33                             }
 34
 35                         }
 36
 37                     }
 38                 }
 39             }
 40             catch (Exception)
 41             {
 42                 return ;
 43             }
 44
 45         }
 46
 47         public bool IsSplitOk(IFeature feature, IGeometry splitLine)
 48         {
 49             bool ok = false;
 50             try
 51             {
 52                 ITopologicalOperator shape = feature.Shape as ITopologicalOperator;
 53                 IGeometry geometry = shape.Intersect(splitLine, esriGeometryDimension.esriGeometry0Dimension);
 54                 if (!geometry.IsEmpty)
 55                 {
 56                     IPointCollection points = geometry as IPointCollection;
 57                     if(points.PointCount==1)
 58                     {
 59                         IPoint point = points.get_Point(0);
 60                         if (IsLineStartEndPoint(feature,point))
 61                         {
 62                             ok = true;
 63                         }
 64
 65                     }
 66                     else if (points.PointCount == 2)
 67                     {
 68                         IPoint point1 = points.get_Point(0);
 69                         IPoint point2 = points.get_Point(1);
 70                         if (IsLineStartEndPoint(feature, point1) && IsLineStartEndPoint(feature, point2))
 71                         {
 72                             ok = true;
 73                         }
 74                     }
 75
 76                 }
 77                 return ok;
 78             }
 79             catch (Exception)
 80             {
 81                 return false;
 82             }
 83         }
 84
 85
 86         public bool IsLineStartEndPoint(IFeature feature,IPoint point)
 87         {
 88             bool yes = false;
 89             try
 90             {
 91                 IPolyline line = feature.Shape as IPolyline;
 92                 double len = line.Length;
 93                 IPoint pStart = line.FromPoint;
 94                 if (Math.Abs(pStart.X - point.X) < 0.1 && Math.Abs(pStart.Y - point.Y) < 0.1)
 95                 {
 96                      yes = true;
 97                 }
 98                 else
 99                 {
100                     IPoint pEnd = line.ToPoint;
101                     if (Math.Abs(pEnd.X - point.X) < 0.1 && Math.Abs(pEnd.Y - point.Y) < 0.1)
102                     {
103                         yes = true;
104                     }
105                 }
106                 return yes;
107             }
108             catch (Exception)
109             {
110                 return false;
111             }
112         }