[转] AE中如何由IFeature 如何获取所对应的FeatureClass-优快云博客

本文介绍在ArcGIS中如何通过编程方式确定已删除要素所属的FeatureClass，并获取该要素的ID及坐标信息。适用于点、线、面不同类型的地理要素。

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转载的原文 AE中如何由IFeature 如何获取所对应的FeatureClass

先获取FeatureClass，然后遍历Map中所有的FeatureLayer，然后比较

FeatureClass与FeatureLayer所对应的FeatureClass。

下面的例子中是在编辑功能里，删除一个Feature后，所触发的事件。目的是找到该Feature所在的FullPathName,并且输出该对象的坐标和ID号。

 
            private 
            void 
            OnDeleteFeatureMethod(
            object 
            o) 
           
            {          
           
            　　IFeature pFeature = o 
            as 
            IFeature;         
           
            　　IFeatureClass pFeatureClass = pFeature.Class 
            as 
            IFeatureClass; 
           
            for 
            (
            int 
            i = 0; i < axMapControl1.Map.LayerCount;i++ ) 
           
            　　{
           
            IFeatureLayer iFeatureLayer = axMapControl1.get_Layer(i) 
            as 
            IFeatureLayer; 
           
            IFeatureClass iFeatureCla = iFeatureLayer.FeatureClass; 
           
            if 
            (iFeatureCla == pFeatureClass) 
           
            { 
           
            IWorkspace pWorkSpace = m_EngineEditor.EditWorkspace; 
           
            textBox3.Text += 
            "操作的文件全路径:" 
            + pWorkSpace.PathName + 
            "\\" 
            +       axMapControl1.get_Layer(i).Name + 
            ".shp " 
            + 
            "\r\n"
            ; 
           
            break
            ; 
           
            } 
           
            } 
           
            if 
            (pFeature.Shape.GeometryType == esriGeometryType.esriGeometryPoint) 
           
            { 
           
            IGeometry iGe = pFeature.Shape; 
           
            IPoint ipo = 
            new 
            PointClass(); 
           
            ipo = iGe 
            as 
            IPoint; 
           
            int 
            a = 0; 
           
            int 
            b = 0; 
           
            axMapControl1.FromMapPoint(ipo, 
            ref 
            a, 
            ref   
            b); 
           
            textBox3.Text += 
            "删除的点的ID号：" 
            + pFeature.OID + 
            "，坐标：(" 
            + a + 
            "," 
            + b + 
            ")" 
            + 
            "\r\n"
            ; 
           
            } 
           
            else 
            if 
            (pFeature.Shape.GeometryType == esriGeometryType.esriGeometryPolygon) 
           
            { 
           
            textBox3.Text += 
            "删除的多边形对象的ID号：" 
            + pFeature.OID + 
            "，坐标："
            ; 
           
            IPolygon pPolygon = (IPolygon)pFeature.Shape; 
           
            int 
            a = 0; 
           
            int 
            b = 0; 
           
            //把该feature强制转换为一个点的集合，再取点的坐标 
           
            IPointCollection pPointCollection = pPolygon 
            as 
            IPointCollection; 
           
            for 
            (
            int 
            i = 0; i < pPointCollection.PointCount - 1; i++) 
           
            { 
           
            IPoint ipo = pPointCollection.get_Point(i); 
           
            axMapControl1.FromMapPoint(ipo, 
            ref 
            a, 
            ref   
            b); 
           
            textBox3.Text += 
            "(" 
            + a + 
            "," 
            + b + 
            ")" 
            + 
            "\t"
            ; 
           
            } 
           
            textBox3.Text += 
            "\r\n"
            ; 
           
            } 
           
            else 
            if 
            (pFeature.Shape.GeometryType == esriGeometryType.esriGeometryPolyline) 
           
            { 
           
            textBox3.Text += 
            "删除的线对象的ID号：" 
            + pFeature.OID + 
            "，其坐标："
            ; 
           
            IPolyline pPolygon = (IPolyline)pFeature.Shape; 
           
            int 
            a = 0; 
           
            int 
            b = 0; 
           
            //把该feature强制转换为一个点的集合，再取点的坐标 
           
            IPointCollection pPointCollection = pPolygon 
            as 
            IPointCollection; 
           
            for 
            (
            int 
            i = 0; i < pPointCollection.PointCount; i++) 
           
            { 
           
            IPoint ipo = pPointCollection.get_Point(i); 
           
            axMapControl1.FromMapPoint(ipo, 
            ref 
            a, 
            ref   
            b); 
           
            textBox3.Text += 
            "(" 
            + a + 
            "," 
            + b + 
            ")" 
            + 
            "\t"
            ; 
           
            } 
           
            textBox3.Text += 
            "\r\n"
            ; 
           
            　　}
           
            　　axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGeography, 
            null
            , 
            null
            ); 
           
            }