C# 读取 Geodatabase

来源：互联网发布：603881数据港股票编辑：程序博客网时间：2024/06/07 13:46

概述

在之前的博客中http://blog.csdn.net/mytudousi/article/details/31350807介绍了Geodatabase的大体情况，既然有了Geodatabase这么一个数据框架，想着我们使用AE读取的时候应该也不会太复杂，至少在读取的时候不用太关心其存储的方式。读取完数据得到的数据模型可以直接进行展示和编辑操作，而不用关系数据源的类型。AE确实有这样的一组接口来完成该工作。

在AE用来数据读取的主要的接口包括IWorkspaceFactory和IWorkspace两个接口。根据不同的数据源，AE提供了不同的WorkspaceFactory，通过WorkspaceFactory的Open方法得到不同的Workspace，通过Workspace就可以打开各种数据了。其接口体系图如下：

从上图我们可以看出当我们需要打开指定的Worksapce之前，我们要确定打开的时哪种类型的Workspace，然后实例化相应的WorkspaceFactory，接下来调用Open方法，当然在调用Open方法时要传入对用的Workspace的连接参数，最后就能得到Worksapce的实例了。得到该实例之后，我们就可以把得到的IWorkspace转换成相应的接口来打开要素类数据、栅格数据或其他数据。

下面就是打开常用Workspace的方法。

打开ShapeFile

在打开ShapeFile时，我们把shapeFile所在的文件夹作为ShapeFile的Workpace，ShapeFile只是该Workspace下面的一个要素类。

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ESRI.ArcGIS.Geodatabase.IWorkspaceFactory workspaceFactory = new ESRI.ArcGIS.DataSourcesFile.ShapefileWorkspaceFactoryClass();
// workspaceFactory.OpenFromFile,传入的参数是Shapefile文件所在的文件夹路径
ESRI.ArcGIS.Geodatabase.IFeatureWorkspace featureWorkspace = (ESRI.ArcGIS.Geodatabase.IFeatureWorkspace)workspaceFactory.OpenFromFile("D:\\", 0);
// OpenFeatureClass传入的参数是shape文件的文件名，不带后缀
ESRI.ArcGIS.Geodatabase.IFeatureClass featureClass = featureWorkspace.OpenFeatureClass("道路");

            ESRI.ArcGIS.Geodatabase.IWorkspaceFactory workspaceFactory = new ESRI.ArcGIS.DataSourcesFile.ShapefileWorkspaceFactoryClass();      // workspaceFactory.OpenFromFile,传入的参数是Shapefile文件所在的文件夹路径      ESRI.ArcGIS.Geodatabase.IFeatureWorkspace featureWorkspace = (ESRI.ArcGIS.Geodatabase.IFeatureWorkspace)workspaceFactory.OpenFromFile("D:\\", 0);       // OpenFeatureClass传入的参数是shape文件的文件名，不带后缀      ESRI.ArcGIS.Geodatabase.IFeatureClass featureClass = featureWorkspace.OpenFeatureClass("道路");

打开SDE

打开SDE的时候，需要设置一些连接参数，例如服务地址、端口、用户名、密码和版本。

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ESRI.ArcGIS.esriSystem.IPropertySet pPropSet=new PropertySetClass();
pPropSet.SetProperty("server","服务器机器名" );
pPropSet.SetProperty("instance","SDE运行的端口号");
pPropSet.SetProperty("user","用户名");
pPropSet.SetProperty("password","口令" );
pPropSet.SetProperty("version","版本");
SdeWorkspaceFactory sdeWkspFact=new SdeWorkspaceFactoryClass();
IFeatureWorkspace pFeaWksp=(IFeatureWorkspace)sdeWkspFact.Open(pPropSet,0);

ESRI.ArcGIS.esriSystem.IPropertySet pPropSet=new PropertySetClass();pPropSet.SetProperty("server","服务器机器名" );pPropSet.SetProperty("instance","SDE运行的端口号");pPropSet.SetProperty("user","用户名");pPropSet.SetProperty("password","口令" );pPropSet.SetProperty("version","版本");SdeWorkspaceFactory sdeWkspFact=new SdeWorkspaceFactoryClass();IFeatureWorkspace pFeaWksp=(IFeatureWorkspace)sdeWkspFact.Open(pPropSet,0);

打开个人数据库 Acess

个人数据库就是Acess数据库了，不过现在已经不太推荐使用，都推荐使用ArcGIS的文件数据库即GDB

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string filePath="E:\\tt.mdb";
AccessWorkspaceFactory fac=new AccessWorkspaceFactoryClass();
IFeatureWorkspace space=(IFeatureWorkspace)fac.OpenFromFile(filePath,0)

string filePath="E:\\tt.mdb";AccessWorkspaceFactory fac=new AccessWorkspaceFactoryClass();IFeatureWorkspace space=(IFeatureWorkspace)fac.OpenFromFile(filePath,0)

OpenFromFile是IWorkspaceFactory的一个对于文件的快捷的打开方式，也可以使用IProperty打开。

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IPropertySet propertySet = new PropertySetClass();
/参数database就是Acess文件的路径
propertySet.SetProperty("DATABASE", database);
IWorkspaceFactory workspaceFactory = new AccessWorkspaceFactoryClass();
return workspaceFactory.Open(propertySet, 0);

IPropertySet propertySet = new PropertySetClass();/参数database就是Acess文件的路径propertySet.SetProperty("DATABASE", database);IWorkspaceFactory workspaceFactory = new AccessWorkspaceFactoryClass();return workspaceFactory.Open(propertySet, 0);

打开文件数据库 GDB

文件数据库就是GDB文件夹了，里面存储着一些二进制文件。打开GDB文件其实和打开Acess文件的方式类似。

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string filePath="E:\\tt.gdb";
FileGDBWorkspaceFactoryClass fac=new FileGDBWorkspaceFactoryClass();
IFeatureWorkspace space=(IFeatureWorkspace)fac.OpenFromFile(filePath,0)

string filePath="E:\\tt.gdb";FileGDBWorkspaceFactoryClass fac=new FileGDBWorkspaceFactoryClass();IFeatureWorkspace space=(IFeatureWorkspace)fac.OpenFromFile(filePath,0)

OpenFromFile是IWorkspaceFactory的一个对于文件的快捷的打开方式，也可以使用IProperty打开。

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IPropertySet propertySet = new PropertySetClass();
/参数database就是gdb文件的路径
propertySet.SetProperty("DATABASE", database);
IWorkspaceFactory workspaceFactory = new FileGDBWorkspaceFactoryClass();
return workspaceFactory.Open(propertySet, 0);

IPropertySet propertySet = new PropertySetClass();/参数database就是gdb文件的路径propertySet.SetProperty("DATABASE", database);IWorkspaceFactory workspaceFactory = new FileGDBWorkspaceFactoryClass();return workspaceFactory.Open(propertySet, 0);

AutoCAD dwg文件

AutoCAD dwg文件比较特殊，在CAD中似乎不太区分线和面的，也不太注重面是否有意义。我们使用ArcMap打开一个CAD文件时，可以看到里面有四个图层，分别是点、线、面和标注。所以我们使用ArcEngine打开一个CAD文件的结果应该是和ArcMap打开一样的。例如在D盘有一个0.dwg的CAD文件，打开改文件的代码如下：

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CadWorkspaceFactoryClass fac=new CadWorkspaceFactoryClass ();
String filePath="D:\\";
IFeatureWorkspace space=fac.OpenFromFile(filePath,0) as IFeatureWorkspace ;
<pre name="code" class="csharp">//点
IFeatureClass point=space.OpenFeatureClass ("0.dwg:Point");
layer=new CadFeatureLayerClass ();
layer.FeatureClass =point;

CadWorkspaceFactoryClass fac=new CadWorkspaceFactoryClass ();String filePath="D:\\";IFeatureWorkspace space=fac.OpenFromFile(filePath,0) as IFeatureWorkspace ;<pre name="code" class="csharp">//点IFeatureClass point=space.OpenFeatureClass ("0.dwg:Point");layer=new CadFeatureLayerClass ();layer.FeatureClass =point;

//线IFeatureClass polyline =space.OpenFeatureClass("0.dwg:Polyline");IFeatureLayer layer=new CadFeatureLayerClass ();layer.FeatureClass =polyline;//面IFeatureClass polygon=space.OpenFeatureClass ("0.dwg:Polygon");layer=new CadFeatureLayerClass();layer.FeatureClass =polygon;//注记IFeatureClass anno=space.OpenFeatureClass ("0.dwg:Annotation"); layer=new CadAnnotationLayerClass();layer.FeatureClass =anno;

打开本地栅格数据 tif、img

打开本地的栅格数据有一个快捷的方式，就是通过RasterLayer打开，代码如下：

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IRasterLayer rasterLayer = new RasterLayerClass();
<pre name="code" class="csharp">// fileName指存本地的栅格文件路径
rasterLayer.CreateFromFilePath(fileName);

IRasterLayer rasterLayer = new RasterLayerClass(); <pre name="code" class="csharp">// fileName指存本地的栅格文件路径rasterLayer.CreateFromFilePath(fileName);

用IRasterDataset接口打开栅格数据集

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WorkspaceFactory workspaceFactory = new RasterWorkspaceFactory();
IWorkspace workspace;
//inPath栅格数据存储路径，文件夹路径
workspace = workspaceFactory.OpenFromFile(inPath, 0);
IRasterWorkspace rastWork = (IRasterWorkspace)workspace;
IRasterDataset rastDataset;
//inName栅格文件名
rastDataset= rastWork.OpenRasterDataset(inName);

WorkspaceFactory workspaceFactory = new RasterWorkspaceFactory(); IWorkspace workspace; //inPath栅格数据存储路径，文件夹路径workspace = workspaceFactory.OpenFromFile(inPath, 0); IRasterWorkspace rastWork = (IRasterWorkspace)workspace; IRasterDataset rastDataset; //inName栅格文件名rastDataset= rastWork.OpenRasterDataset(inName);

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