原文 AE加载不同数据的方法（GeoDatabase空间数据管理）
GeoDatabase
先看一下GeoDatabase核心结构模型图：
1 工作空间工厂WorkspaceFactory对象
WorkspaceFactory是GeoDatabase的入口，是一个抽象类，拥有很多子类，例如SdeWorkspaceFactory, AccessWorkspaceFactory, ShapfileWorkspaceFactory CadWorkspaceFactory等
IWorkspaceFactory接口定义了所有工作空间对象的一般属性和方法
public IWorkspaceName Create (string parentDirectory,string Name,IPropertySet ConnectionProperties,int hWnd);用于产生一个新的工作空间名称对象，前两个参数是数据库的路径和名称，第三个参数是一个属性集（properset）对象。
public IWorkspace Open ( IPropertySet ConnectionProperties,int hWnd);打开一个已经存在的工作空间像SDE数据库等；
public IWorkspace OpenFromFile (string fileName,int hWnd);打开一个文件类型的数据
2 工作空间WorkSpace对象
Workspace在逻辑上是一个包含空间数据集和非空间数据集的数据容器，数据包括要素类、栅格数据集、表等对象
Workspace对象主要的一些接口：
1 IWorkspace接口：定义了一个工作空间最普通的属性和方法。
2 IFeatureWorkspace接口
这个接口主要用于管理要素的数据集，如表（Table）、对象类（ObjectClass）、要素类（FeatureClass）、要素数据集（FeatureDataset）和关系类（RelationshipClass）等。
主要的成员：
public IFeatureClass OpenFeatureClass ( string Name) 打开一个已经存在的要素类，无论这个要素类是在工作空间还是在一个要素数据集中
public IFeatureDataset OpenFeatureDataset (string Name);打开一个已经存在的要素数据集
public ITable OpenTable (string Name);打开一个已经存在的表；
3 RasterWorkspace对象
主要实现了IRasterWorkspace接口
public IRasterDataset OpenRasterDataset ( string Name);
4 属性集Propertyset对象
Propertyset对象是一个专门用于设置属性的对象，它是一种name-value对应的集合，类似于Hash表。属性名必须是字符串，属性值可以是字符串、数值或日期也可以是一个对象
5 DataSet数据集对象
Dataset对象可分为两大类：Table和GeoDataset，GeoDataset是一个抽象类，代表了拥有空间属性的数据集，包括FeatureDataset、要素类FeatureClass、TIN和栅格数据集RasterDataset。
6 FeatureDataset对象
实现的主要接口
1 IFeatureDataset接口
public IEnumDataset Subsets {get;}：Datasets contained within this dataset.
2 IFeatureClassContainer接口
用于管理要素数据集里面的要素类，该接口的ClassByName和Class（index）等属性可以用来获取数据集中的特定的要素类（这里很奇怪在帮助文档中只有属性没有方法但点进去却是一个方法Ok你大概不理解我说的）
public IFeatureClass get_Class (int ClassIndex);
public IFeatureClass get_ClassByID (int ID);
public IFeatureClass get_ClassByName (string Name);
例子
1 加载Shapefiles文件
OpenFileDialog dlg=new OpenFileDialog(); dlg.Title="打开shapefile文件"; dlg.Filter="(*.shp)|*.shp"; dlg.ShowDialog(); string filename=dlg.FileName; int index=filename.LastIndexOf(@"\"); string path=filename.Substring(0,index); string name=filename.Substring(index+1); IWorkspaceFactory pWsFactory = new ShapefileWorkspaceFactoryClass(); IFeatureWorkspace pWorkSpace = pWsFactory.OpenFromFile(path, 0) as IFeatureWorkspace; IFeatureClass pFeatureClass = pWorkSpace.OpenFeatureClass(name); IFeatureLayer pFeatureLayer = new FeatureLayerClass(); pFeatureLayer.Name = pFeatureClass.AliasName; pFeatureLayer.FeatureClass = pFeatureClass; axMapControl1.Map.AddLayer(pFeatureLayer); axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
2.加载栅格数据
OpenFileDialog dlg = new OpenFileDialog(); dlg.Title = "打开Raster文件"; dlg.Filter = " Layer File(*.lyr)|*.jpg;*.bmp;*.tiff "; dlg.ShowDialog(); string filename = dlg.FileName; int index = filename.LastIndexOf(@"\"); string path = filename.Substring(0, index); string name = filename.Substring(index + 1); IWorkspaceFactory pWsFactory =new RasterWorkspaceFactoryClass(); IRasterWorkspace pRasterWorkspace = pWsFactory.OpenFromFile(path, 0) as IRasterWorkspace; IRasterDataset pRasterDataset = pRasterWorkspace.OpenRasterDataset(name); IRasterLayer pRasterLayer = new RasterLayerClass(); pRasterLayer.CreateFromDataset(pRasterDataset); axMapControl1.Map.AddLayer(pRasterLayer); axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
3 加载CAD数据
OpenFileDialog dlg = new OpenFileDialog(); dlg.Title = "打开CAD文件"; dlg.Filter = " CAD(*.dwg)|*.dwg|All Files(*.*)|*.* "; dlg.ShowDialog(); string filename = dlg.FileName; int index = filename.LastIndexOf(@"\"); string path = filename.Substring(0, index); string name = filename.Substring(index + 1); IWorkspaceFactory pWsFactory = new CadWorkspaceFactoryClass(); IFeatureWorkspace pFeatureWorkspace = pWsFactory.OpenFromFile(path, 0) as IFeatureWorkspace; IFeatureDataset pFeatureDataset = pFeatureWorkspace.OpenFeatureDataset(name); IFeatureClassContainer pFCContainer = pFeatureDataset as IFeatureClassContainer; for (int i = 0; i < pFCContainer.ClassCount; i++) { IFeatureClass pFeatureClass = pFCContainer.get_Class(i); if (pFeatureClass.FeatureType == esriFeatureType.esriFTCoverageAnnotation) { IFeatureLayer pFeatureLayer = new CadAnnotationLayerClass(); } else { IFeatureLayer pFeatureLayer = new FeatureLayerClass(); pFeatureLayer.FeatureClass = pFeatureClass; pFeatureLayer.Name = pFeatureClass.AliasName; axMapControl1.Map.AddLayer(pFeatureLayer); } axMapControl1.ActiveView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
4 加载PersonGeodatabase数据
OpenFileDialog dlg = new OpenFileDialog(); dlg.Title = "打开Geodatabase文件"; dlg.Filter = " Personal Geodatabase(*.mdb)|*.mdb|All Files(*.*)|*.* "; dlg.ShowDialog(); string path = dlg.FileName; IWorkspaceFactory pAccessWorkspaceFactory; IFeatureWorkspace pFeatureWorkspace; IFeatureLayer pFeatureLayer; IFeatureDataset pFeatureDataset; pAccessWorkspaceFactory = new AccessWorkspaceFactoryClass(); IWorkspace pWorkspace = pAccessWorkspaceFactory.OpenFromFile(path, 0); IEnumDataset pEnumDataset = pWorkspace.get_Datasets(ESRI.ArcGIS.Geodatabase.esriDatasetType.esriDTAny); pEnumDataset.Reset(); IDataset pDataset = pEnumDataset.Next(); if (pDataset is IFeatureDataset) { pFeatureWorkspace = (IFeatureWorkspace)pAccessWorkspaceFactory.OpenFromFile(path, 0); pFeatureDataset = pFeatureWorkspace.OpenFeatureDataset(pDataset.Name); IEnumDataset pEnumDataset1 = pFeatureDataset.Subsets; pEnumDataset1.Reset(); IDataset pDataset1 = pEnumDataset1.Next(); if (pDataset1 is IFeatureClass) { pFeatureLayer = new FeatureLayerClass(); pFeatureLayer.FeatureClass = pFeatureWorkspace.OpenFeatureClass(pDataset1.Name); pFeatureLayer.Name = pFeatureLayer.FeatureClass.AliasName; axMapControl1.Map.AddLayer(pFeatureLayer); axMapControl1.ActiveView.Refresh(); } } else { pFeatureWorkspace = (IFeatureWorkspace)pWorkspace; pFeatureLayer = new FeatureLayerClass(); pFeatureLayer.FeatureClass = pFeatureWorkspace.OpenFeatureClass(pDataset.Name); pFeatureLayer.Name = pFeatureLayer.FeatureClass.AliasName; axMapControl1.Map.AddLayer(pFeatureLayer); axMapControl1.ActiveView.Refresh(); }
