ArcGIS Engine代码共享-图层（Layer）操作
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public class LayerHelper { public static string GetClassOwnerName(string pDSName) { int index = pDSName.IndexOf("."); if (index >= 0) { pDSName = pDSName.Substring(0, index); } else { pDSName = ""; } pDSName = pDSName.ToUpper(); return pDSName; } public static string GetClassShortName(IDataset paramDS) { if (paramDS == null) { return ""; } return GetClassShortName(paramDS.Name.ToUpper()); } public static string GetClassShortName(IFeatureClass fc) { try { string str = ""; str = (fc as IDataset).Name; int num = str.LastIndexOf("."); if (num >= 0) { str = str.Substring(num + 1); } return str; } catch { return ""; } } public static string GetClassShortName(string paramName) { string str = paramName; int num = paramName.LastIndexOf("."); if (num >= 0) { str = paramName.Substring(num + 1); } return str; } public static ArrayList GetIntersectFeature(IGeoFeatureLayer pLayer, IGeometry pGeom) { ArrayList list = new ArrayList(); if (pLayer != null) { if ((pGeom == null) || pGeom.IsEmpty) { return list; } ISpatialReference reference = (pLayer.FeatureClass as IGeoDataset).SpatialReference; if (reference != null) { pGeom.SpatialReference = reference; pGeom.SnapToSpatialReference(); } ISpatialFilter filter = new SpatialFilterClass(); filter.Geometry = pGeom; filter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects; IFeatureCursor o = pLayer.FeatureClass.Search(filter, false); for (IFeature feature = o.NextFeature(); feature != null; feature = o.NextFeature()) { list.Add(feature); } Marshal.ReleaseComObject(o); } return list; } public static ArrayList GetIntersectFeature(IGeoFeatureLayer pLayer, IPolygon pPoly) { return GetIntersectFeature(pLayer, (IGeometry)pPoly); } public static List<IFeature> GetIntersectFeature(IFeatureClass pClass, IGeometry pGeom) { List<IFeature> list = new List<IFeature>(); if (pClass != null) { if ((pGeom == null) || pGeom.IsEmpty) { return list; } ISpatialReference reference = (pClass as IGeoDataset).SpatialReference; if (reference != null) { pGeom.SpatialReference=reference; pGeom.SnapToSpatialReference(); } ISpatialFilter filter = new SpatialFilterClass(); filter.Geometry = pGeom; filter.SpatialRel = esriSpatialRelEnum.esriSpatialRelIntersects; IFeatureCursor o = pClass.Search(filter, false); for (IFeature feature = o.NextFeature(); feature != null; feature = o.NextFeature()) { list.Add(feature); } Marshal.ReleaseComObject(o); } return list; } public static string GetLayerAliasName(IMap pMap, string sLayerName) { return QueryLayerByModelName(pMap, sLayerName).FeatureClass.AliasName; } public static int IndexOfLayer(IMap paramMap, ILayer paramLayer) { int num2 = paramMap.LayerCount; for (int i = 0; i < num2; i++) { if (paramMap.get_Layer(i) == paramLayer) { return i; } } return -1; } public static int IndexOfLayer(IMap pMap, string sAliasName) { if (pMap != null) { if (sAliasName == "") { return -1; } for (int i = 0; i < pMap.LayerCount; i++) { if (pMap.get_Layer(i).Name == sAliasName) { return i; } } } return -1; } public static string LayerTypeName(ILayer paramLayer) { string str = ""; if (paramLayer is IGeoFeatureLayer) { IFeatureClass class2 = (paramLayer as IGeoFeatureLayer).FeatureClass; if (class2 != null) { str = GeometryHelper.ShapeTypeName(class2.ShapeType); } return str; } if (paramLayer is IRasterLayer) { return "影像"; } if (paramLayer is ITopologyLayer) { return "拓扑"; } if (paramLayer is IAnnotationLayer) { str = "注记"; } return str; } public static void LoadLayerFromStream(ILayer paramLayer, byte[] paramLayerContent) { if (((paramLayer != null) && (paramLayerContent != null)) && (paramLayerContent.Length != 0)) { IPersistStream stream = paramLayer as IPersistStream; XMLStreamClass class2 = new XMLStreamClass(); class2.LoadFromBytes(ref paramLayerContent); stream.Load(class2); } } public static ILayer QueryLayerByDisplayName(IMap paramMap, string layerName) { int num = paramMap.LayerCount; layerName = layerName.ToUpper(); for (int i = 0; i < num; i++) { ILayer layer = paramMap.get_Layer(i); if (layer.Name.ToUpper().Equals(layerName)) { return layer; } } return null; } public static IGeoFeatureLayer QueryLayerByModelName(IMap paramMap, string paramModelName) { if (paramMap != null) { if (paramModelName == null) { return null; } int num = paramMap.LayerCount; paramModelName = paramModelName.ToUpper(); for (int i = 0; i < num; i++) { ILayer layer = paramMap.get_Layer(i); if ((layer is IGeoFeatureLayer) && GetClassShortName((layer as IGeoFeatureLayer).FeatureClass as IDataset).ToUpper().Equals(paramModelName)) { return (layer as IGeoFeatureLayer); } } } return null; } public static string QueryLayerModelName(ILayer curLayer) { if (curLayer == null) { return ""; } if (curLayer is IGeoFeatureLayer) { return GetClassShortName((curLayer as IGeoFeatureLayer).FeatureClass as IDataset); } return curLayer.Name; } public static double QueryXYUnit(IGeoFeatureLayer paramLayer) { if (paramLayer != null) { return QueryXYUnit(paramLayer.FeatureClass); } return double.NaN; } public static double QueryXYUnit(IFeatureClass paramClass) { IGeoDataset dataset = paramClass as IGeoDataset; if (dataset != null) { ISpatialReference reference = dataset.SpatialReference; if (reference != null) { double num = 0.0; double num2 = 0.0; double num3 = 0.0; reference.GetFalseOriginAndUnits(out num, out num2, out num3); if (num3 != 0.0) { return (1.0 / num3); } } } return double.NaN; } public static byte[] SaveLayerToStream(ILayer paramLayer) { byte[] buffer = null; if (paramLayer is IPersistStream) { IPersistStream stream = paramLayer as IPersistStream; XMLStreamClass class2 = new XMLStreamClass(); stream.Save(class2, 0); buffer = class2.SaveToBytes(); } return buffer; } /// <summary> /// 获得一个shapefile文件的的要素类对象 /// </summary> /// <param name="sFilePath"></param> /// <returns></returns> public static IFeatureClass GetShapefileWorkspaceFeatureClass(string sFilePath) { try { IWorkspaceFactory pWSF = new ShapefileWorkspaceFactoryClass(); string sPath = System.IO.Path.GetDirectoryName(sFilePath); IWorkspace pWS = pWSF.OpenFromFile(sPath, 0); string sFileName = System.IO.Path.GetFileNameWithoutExtension(sFilePath); IFeatureWorkspace pFWS = pWS as IFeatureWorkspace; IFeatureClass pFC = pFWS.OpenFeatureClass(sFileName); return pFC; } catch (Exception ex) { return null; } } public static IFeatureClassName GetFeatureClassName(IFeatureClass pfc) { IDataset pDS = pfc as IDataset; IWorkspaceName workspaceName = new WorkspaceNameClass(); workspaceName = pDS.FullName as IWorkspaceName; IFeatureClassName featureClassName = new FeatureClassNameClass(); IDatasetName datasetName = (IDatasetName)featureClassName; datasetName.Name = pDS.Name; datasetName.WorkspaceName = workspaceName; return featureClassName; } }
