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

	All Properties Methods	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.

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();
 
            } 
        }