如何删除要素类 IFeatureWorkspace 接口介绍(1)

最新推荐文章于 2021-07-08 08:55:38 发布

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最新推荐文章于 2021-07-08 08:55:38 发布

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文章标签：数据库

原文链接：http://www.cnblogs.com/qiushuixizhao/p/3242585.html

本文详细介绍了如何使用IFeatureWorkspace接口删除要素类，包括打开要素类、使用IDataset对象进行删除操作，并提供了在ArcMap环境下的具体实现方式。

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如何删除要素类
要想删除一个要素类，那么必须先得到这个，在得到这个要素类的时候，我们要学习一个新的接口IFeatureWorkspace。
IFeatureWorkspace 接口介绍
这个接口主要是用于管理基于矢量数据的，如表，，要素类，要素数据集等。

Members

	AllPropertiesMethods	Description
	CreateFeatureClass	Creates a new standalone feature class under the workspace.
	CreateFeatureDataset	Creates a new feature dataset.
	CreateQueryDef	Create a query definition object.
	CreateRelationshipClass	Creates a new relationship class.
	CreateTable	Creates a new table.
	OpenFeatureClass	Opens an existing feature class.
	OpenFeatureDataset	Opens an existing feature dataset.
	OpenFeatureQuery	Opens a feature dataset containing a single feature class defined by the specified Query.
	OpenRelationshipClass	Opens an existing relationship class.
	OpenRelationshipQuery	The table of a relationship join query.
	OpenTable	Opens an existing table.

Classes that implement IFeatureWorkspace

Classes	Description
Sde3Workspace (esriDataSourcesGDB)	ESRI SDE (3.x) Feature Database.
Sde4Workspace (esriDataSourcesGDB)	ESRI SDE (4.x) Feature Database.
VersionedWorkspace	VersionedWorkspace Object.
Workspace	Workspace Object.

OpenDataset，OpenTable，OpenFeatureClass都是要传入一个相应的名称，如要打开一个名称为PointTest的要素类，只需要在OpenFeatureClass中传入这个要素类的名称，代码如下：
　　　　IWorkspaceFactory pWsFt = new AccessWorkspaceFactoryClass();
　　　 IWorkspace pWs = pWsFt.OpenFromFile(WsName, 0);
　　　　IFeatureWorkspace pFWs = pWs as IFeatureWorkspace;

                IFeatureClass pFClass = pFWs.OpenFeatureClass("PointTest");

如果是在ArcMap中，我们会切换到Catalog中然后进入相应的数据库，然后删除相应的要素类，这种操作会让我们想到FeatureClas这个对象会提供删除的方法，其实不然，这个删除的方法是定义在Dataset这
个对象中。
private void button1_Click(object sender, EventArgs e)
        {
            string WsName = WsPath();

            if( WsName !="")
            {

                IWorkspaceFactory pWsFt = new AccessWorkspaceFactoryClass();

                IWorkspace pWs = pWsFt.OpenFromFile(WsName, 0);

                IFeatureWorkspace pFWs = pWs as IFeatureWorkspace;

                IFeatureClass pFClass = pFWs.OpenFeatureClass("PointTest");

                IDataset pDatset = pFClass as IDataset;

                pDatset.Delete();

            }
        }