AE开发技术文档--8种数据访问方法

转自原文 AE开发技术文档--8种数据访问方法

1、shapefile

IWorkspaceFactory pWorkspaceFactory;
pWorkspaceFactory = new ShapefileWorkspaceFactoryClass();
IFeatureWorkspace pFeatWS;
pFeatWS = pWorkspaceFactory.OpenFromFile(@"D:\Data", 0) as
IFeatureWorkspace;

//打开一个要素类
IFeatureClass pFeatureClass = pFeatWS.OpenFeatureClass("Cities");

2、coverage

Coverage 是一个集合，它可以包含一个或多个要素类。Coverage 数据的工作空间也是它所在的文件夹；由于Coverage 可以包含多个要素类，得到工作空间后在打开具体的要素类时可以用“Coverage 名称:要素类名称”，例如下面代码中的“basin:polygon”。

IWorkspaceFactory pFactory = new ArcInfoWorkspaceFactoryClass();
IWorkspace pWorkspace =
pFactory.OpenFromFile(@"D:\ArcTutor\TopologyData", 0);
IFeatureWorkspace pFeatWorkspace = pWorkspace as IFeatureWorkspace;
IFeatureClass pFeatureClass =
pFeatWorkspace.OpenFeatureClass("basin:polygon");

3、Geodatabase

Personal Geodatabase 数据的工作空间指的是扩展名为mdb 的文件。以下是打开位于Monto.mdb
中的Water 要素类的代码。

IWorkspaceFactory pFactory = new AccessWorkspaceFactoryClass();
IWorkspace pWorkspace =
pFactory.OpenFromFile(@"D:\ArcTutor\Monto.mdb", 0);
IFeatureWorkspace pFeatWorkspace = pWorkspace as IFeatureWorkspace;
IFeatureClass pFeatureClass =
pFeatWorkspace.OpenFeatureClass("Water")

4、ArcSDE（Enterprise Geodatabase）

IWorkspaceFactory pWorkspaceFactory = new SdeWorkspaceFactoryClass();
IPropertySet propSet = new PropertySetClass();
propSet.SetProperty("SERVER", "actc");
propSet.SetProperty("INSTANCE", "5151");
propSet.SetProperty("USER", "apdm");
propSet.SetProperty("ASSWORD", "apdm");
propSet.SetProperty("VERSION", "SDE.DEFAULT");
IWorkspace pWorkspace = pWorkspaceFactory.Open(propSet, 0);
IFeatureWorkspace pFeatWS = pWorkspace as IFeatureWorkspace;
IFeatureClass pFeatureClass=
pFeatWS.OpenFeatureClass("ControlPoint");

5、Tin

IWorkspaceFactory pWSFact = new TinWorkspaceFactoryClass();
IWorkspace pWS = pWSFact.OpenFromFile(@"D:\ArcTutor\3DAnalyst", 0);
ITinWorkspace pTinWS = pWS as ITinWorkspace;
ITin pTin = pTinWS.OpenTin("mal");

6、栅格数据

IWorkspaceFactory rasterWorkspaceFactory = new RasterWorkspaceFactoryClass();
IRasterWorkspace rasterWorkspace
=rasterWorkspaceFactory.OpenFromFile(@"D:\data\grid", 0) as
IRasterWorkspace;
IRasterDataset rasterDataset=
rasterWorkspace.OpenRasterDataset("ca_hillshade");

7、CAD

以下代码是打开位于D:\ArcTutor\Editor\ExerciseData\EditingFeatures 文件夹下的buildings.dxf
中的
多边形要素类。

IWorkspaceFactory pCadwf = new CadWorkspaceFactoryClass();
IWorkspace pWS =
pCadwf.OpenFromFile(@"D:\ArcTutor\Editor\ExerciseData\EditingFeatures",
0);
IFeatureWorkspace pCadFWS = pWS as IFeatureWorkspace;
IFeatureClass pFeatClass =
pCadFWS.OpenFeatureClass("buildings.dxf:polygon");

8、一般关系表

//创建一个连接
IPropertySet pPropset;
pPropset = new PropertySetClass();
pPropset.SetProperty("CONNECTSTRING",
@"rovider=Microsoft.Jet.OLEDB.4.0;Data Source=E:\Company.mdbersist Security
Info=False");
//创建一个新的OleDB工作空间并打开
IWorkspaceFactory pWorkspaceFact;
IFeatureWorkspace pFeatWorkspace;
pWorkspaceFact = new OLEDBWorkspaceFactoryClass();
pFeatWorkspace = pWorkspaceFact.Open(pPropset, 0) as IFeatureWorkspace;
ITable pTTable = pFeatWorkspace.OpenTable("Custom");