[求助]FeatureClass与Coverage之间的转换问题

怎样实现FeatureClass与Coverage数据格式之间的转换，望高手赐教

<P>有个FeatureclassToCoverage类，但是不知道怎么用，好像没有实现ICommand和ITool接口<IMG src="http://www.gisempire.com/bbs/Skins/default/topicface/face17.gif" align=absMiddle></P>

<DIV>用Geoprocessor调用FeatureclassToCoverage类，但是Coverage里面时空的，代码如下，不知道什么地方出错？<BR>            IFeatureLayer layer = axMapControl1.ActiveView.FocusMap.get_Layer(0) as IFeatureLayer;<BR>            IFeatureClass featureClass = layer.FeatureClass;<BR>            IWorkspaceFactory factory = new ArcInfoWorkspaceFactoryClass();<BR>            IArcInfoWorkspace workspace;<BR>            IPropertySet propertyset = new PropertySetClass();<BR>            propertyset.SetProperty("DATABASE", @"E:\arcgistest");<BR>            workspace = factory.Open(propertyset, 0) as IArcInfoWorkspace;<BR>            IFeatureDataset coverage = workspace.CreateCoverage("newCov", null, esriCoveragePrecisionType.esriCoveragePrecisionSingle);<BR>            Geoprocessor gp = new Geoprocessor();<BR>            FeatureclassToCoverage ftc = new FeatureclassToCoverage();<BR>            ftc.in_features = featureClass;<BR>            ftc.out_cover = coverage;<BR>            ftc.precision = "DOUBLE";<BR>            gp.Execute(ftc, null);</DIV>