做了线性参考的线要素，可否指定该线上一点，找到该点处的测量值？

【解决办法】：
可以，使用IRouteLocator2.Identify 方法，参数输入的是IEnvelope（可以将IPoint做一个很小的缓冲区，然后获取Envelope），该方法的返回值为IRouteLocation，将其转为IRouteMeasurePointLocation，获取其Measure属性，即为该点的测量值。可以参考下面代码：

  private void FindRout(IFeatureClass _pRouteFC, string _pPKName, object _pID)

        {

            IDataset pDataset = (IDataset)_pRouteFC;

            IName pName = pDataset.FullName;

            IRouteLocatorName pRouteLocatorName = new RouteMeasureLocatorNameClass();

            pRouteLocatorName.RouteFeatureClassName = pName;



            pRouteLocatorName.RouteIDFieldName = _pPKName;

            pRouteLocatorName.RouteMeasureUnit = esriUnits.esriFeet;

            pName = (IName)pRouteLocatorName;

            IRouteLocator2 pRouteLocator = (IRouteLocator2)pName.Open();

         

            IPoint point = new PointClass();

            point.PutCoords(2481479.3658, 758698.4729);

            ITopologicalOperator topo = point as ITopologicalOperator;



            IEnvelope enve = topo.Buffer(0.1).Envelope;

           IEnumRouteIdentifyResult enumresult = pRouteLocator.Identify(enve,);

           enumresult.Reset();

           if (enumresult != null)

           {

               IRouteLocation pRouteLoc1 = new RouteMeasurePointLocationClass();

               IFeature fea = null;

               enumresult.Next(out pRouteLoc1,out fea);

               IRouteMeasurePointLocation rMLineLoc1 = (IRouteMeasurePointLocation)pRouteLoc1;

               double mea = rMLineLoc1.Measure;

           }

         

        }

            IFeatureLayer pFeatureLayer = axMapControl1.get_Layer(0) as IFeatureLayer;

            FindRout(pFeatureLayer.FeatureClass, ROUTE1, 20000013);