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private void PRV_CheckSliver(IFeatureClass IN_Featureclass)        {            List
   
     Temp_AllError = new List
    
     ();//记录所有错误OID            //提取所有要素            IFeatureCursor Temp_GetEachFeature = IN_Featureclass.Search(null, true);            IFeature Temp_EachFeature = Temp_GetEachFeature.NextFeature();            if (Temp_EachFeature != null)            {                //尽量不在循环中创建变量                IPointCollection Temp_Vertices;                IPoint First_Point = new Point();                IPoint Center_Point = new Point();                IPoint Last_Point = new Point();                int i;                //将错误的OID提到List里                while (Temp_EachFeature != null)                {                    //获取要素的点集                    Temp_Vertices = Temp_EachFeature.Shape as IPointCollection;                    Temp_Vertices.AddPoint(Temp_Vertices.get_Point(1));                    for (i = 0; i < Temp_Vertices.PointCount - 3; i++)                    {                        Temp_Vertices.QueryPoint(i, First_Point);                        Temp_Vertices.QueryPoint(i + 1, Center_Point);                        Temp_Vertices.QueryPoint(i + 2, Last_Point);                        double angle = PRV_GetAngle(Center_Point, First_Point, Last_Point);                        if (angle < 30|| angle > 360 - 30)//这里设狭长角为30度                            Temp_AllError.Add(Temp_EachFeature.OID.ToString());                    }                    Temp_EachFeature = Temp_GetEachFeature.NextFeature();                }            }            System.Runtime.InteropServices.Marshal.FinalReleaseComObject(Temp_GetEachFeature);//释放        }
    
   

计算角度的函数

//三个点计算角度        private double PRV_GetAngle(IPoint cen, IPoint first, IPoint second)        {            double ma_x = first.X - cen.X;            double ma_y = first.Y - cen.Y;            double mb_x = second.X - cen.X;            double mb_y = second.Y - cen.Y;            double v1 = (ma_x * mb_x) + (ma_y * mb_y);            double ma_val = Math.Sqrt(ma_x * ma_x + ma_y * ma_y);            double mb_val = Math.Sqrt(mb_x * mb_x + mb_y * mb_y);            double cosM = v1 / (ma_val * mb_val);            double angleAMB = Math.Acos(cosM) * 180 / System.Math.PI;            return angleAMB;        }

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