Arcgis Engine（ae）接口詳解（7）：地圖（map）操做

IMap map = null;
            //跟map同一層次的activeView對象，他們都是「地圖」的對象，map管理地圖內容，activeView管理顯示內容
            IActiveView activeView = map as IActiveView;

            //獲取當前地圖顯示範圍
            IEnvelope extent = activeView.Extent;
            //設置當前地圖顯示範圍，至關於用代碼實現縮放到某個範圍
            activeView.Extent = extent;

            //獲取地圖全圖範圍
            //地圖瀏覽功能中的全圖，他的範圍就是這樣獲取
            IEnvelope fullExtent = activeView.FullExtent;

            //獲取地圖比例尺，同時可同於設置比例尺
            double mapScale = map.MapScale;

            //獲取和設置地圖單位
            esriUnits unit = map.MapUnits;
            //獲取和設置地圖的顯示單位
            esriUnits unit2 = map.DistanceUnits;

            //刷新地圖
            activeView.Refresh();

            //屏幕長度（單位是像素）轉地圖實際長度
            double mapLength = MapHelper.PixelsToMapUnits(activeView, 5);

            //獲取Map的全部FeatureLayer
            List<IFeatureLayer> lstFeatureLayer = MapHelper.GetAllFeatureLayerInMap(map);

            if (1 == 2)
            {
                //在Map中經過真實表名獲取圖層，對於sde的表名不能帶用戶名
                IFeatureLayer featureLayer = MapHelper.GetFeatureLayerByDatasetName(map, "roadLine");


            }

            foreach (IFeatureLayer featureLayer in lstFeatureLayer)
            {
                //圖層相關說明

                //IFeatureLayer表明矢量圖層，而ILayer表明圖層，也是全部類型圖層接口都實現了ILayer，所以IFeatureLayer能夠as到ILayer
                ILayer layer = featureLayer as ILayer;

                //獲取和設置圖層的可視狀態（就是圖層樹界面裏圖層左邊的checkbox）
                bool visible = layer.Visible;
                //獲取或設置圖層名稱
                string name = layer.Name;

                //經過圖層獲取featureClass，是獲取featureClass的方法之一。另外一種方法是經過workspace獲取
                //注意IFeatureLayer和IFeatureClass是兩個東西，雖然平時會都叫「圖層」。IFeatureClass是指物理表，而IFeatureLayer指物理表加載到地圖上造成的圖層，前者更多指數據，後者只圖層在地圖的展現設置，如樣式，標註等
                IFeatureClass featureClass = featureLayer.FeatureClass;                
            }

調用過的封裝函數代碼以下

public static double PixelsToMapUnits(IActiveView activeView, double pixelLength)
        {
            tagRECT tagRect = activeView.ScreenDisplay.DisplayTransformation.get_DeviceFrame();
            int width = tagRect.right - tagRect.left;

            if (width < 0.00001) return pixelLength;
            double scale = activeView.ScreenDisplay.DisplayTransformation.VisibleBounds.Width / width;

            return (pixelLength * scale);
        }

        public static List<IFeatureLayer> GetAllFeatureLayerInMap(IMap map)
        {
            List<IFeatureLayer> result = new List<IFeatureLayer>();

            UID uid = new UIDClass();
            uid.Value = "{40A9E885-5533-11d0-98BE-00805F7CED21}";    //FeatureLayer
            IEnumLayer enumLayer = map.get_Layers(uid, true);
            //對圖層轉換版本
            ILayer layer = null;
            while ((layer = enumLayer.Next()) != null)
            {
                IFeatureLayer featureLayer = layer as IFeatureLayer;
                result.Add(featureLayer);
            }

            return result;
        }

        public static IFeatureLayer GetFeatureLayerByDatasetName(IMap map, string tableName)
        {
            List<IFeatureLayer> lstFeatureLayer = GetAllFeatureLayerInMap(map);

            foreach (IFeatureLayer featureLayer in lstFeatureLayer)
            {
                if (featureLayer.FeatureClass != null)
                {
                    string featureClassName = FeatureClassHelper.GetDatasetNameWithOutSDEUser(featureLayer.FeatureClass as IDataset);
                    if (string.Equals(featureClassName, tableName, StringComparison.OrdinalIgnoreCase))
                    {
                        return featureLayer;
                    }
                }
            }

            return null;
        }

        public static string GetDatasetNameWithOutSDEUser(IDataset dataset)
        {
            if (dataset == null) return "";

            string tDatasetName = dataset.Name;
            if (tDatasetName.Contains("."))
            {
                tDatasetName = tDatasetName.Substring(tDatasetName.LastIndexOf(".") + 1);
            }

            return tDatasetName;
        }