/// <summary>

         /// 得到输入点在输入图层上的最近点

         /// </summary>

         /// <param name="randomPoints">输入的点，注意小数位数不能太长，具体支持多长没有测试，我用小数点2位可以成功，但是七八位肯定不行</param>

         /// <param name="feaPoints">输出在featureclass上距离最近的要素，这里是点类型输出的是点</param>

         /// <param name="length">输入点到featureclass上最近点的距离</param>

         /// <returns></returns>

         public bool NearestPoint(IPoint[] randomPoints, out IPoint[] feaPoints, out double length)

         {

             feaPoints = new IPoint[randomPoints.Length];

             length = ;

             try

             {

                 fd = (LinkReady.ReadPipeLineWorkspace() as IFeatureWorkspace).OpenFeatureDataset(LY.UG.Common.DictionaryConfig.DatasetName["道路网络数据集名称"]);//("SDE.地下管线");

                 nc = fd as INetworkCollection;

                 IFeatureClass feaRoadJunction = (fd as IFeatureClassContainer).get_ClassByName(LY.UG.Common.DictionaryConfig.DatasetName["道路网络点图层"]);

                 int[] feaID = new int[randomPoints.Length];

                 double[] feaDis = new double[randomPoints.Length];

                 IFeatureIndex pFeatureIndex = new FeatureIndex();

                 IIndexQuery pIndexQuery;

                 IGeoDataset geodataset = (IGeoDataset)feaRoadJunction;

                 ITrackCancel trackCancel = new TrackCancel();

                 pFeatureIndex.FeatureClass = feaRoadJunction;//.setFeatureClassByRef(pFeatureClass1);

                 pFeatureIndex.Index(trackCancel, geodataset.Extent);

                 pIndexQuery = pFeatureIndex as IIndexQuery;

                 for (int i = ; i < randomPoints.Length; i++)

                 {

                     pIndexQuery.NearestFeature(randomPoints.GetValue(i) as IPoint, out feaID[i], out feaDis[i]);

                     feaPoints[i] = new PointClass();

                     feaPoints[i] = feaRoadJunction.GetFeature(feaID[i]).ShapeCopy as IPoint;

                     length = length + feaDis[i];

                 }

                 return true;

             }

             catch (Exception ee)

             {

                 return false;

             }

         }