使用ARCGIS ENGINE进行条件查询与新要素类创建

private ifeatureclass QueryToNew(string filePath,string fileFolder,string fileName)
{ 
ifeatureclass result;
if (string.IsNullOrEmpty(filePath))
            {
                return null;
            }

            IWorkspaceFactory factory = new ShapefileWorkspaceFactoryClass();
            IFeatureWorkspace fw = factory.OpenFromFile(fileFolder, 0) as IFeatureWorkspace;

            if (File.Exists(filePath))
            {
                IFeatureClass fc = fw.OpenFeatureClass(fileName);
                IDataset dataset = (IDataset)fc;
                dataset.Delete();
            }

            IFeatureCursor cursor = featureClass.Search(queryFilter, true);
            IFeature feature = cursor.NextFeature();
            if (feature == null)
            {
                return null;
            }
            result = fw.CreateFeatureClass(fileName, featureClass.Fields, null, null, feature.FeatureType, featureClass.Fields.get_Field(1).Name, "");

            IWorkspaceEdit we = fw as IWorkspaceEdit;
            we.StartEditing(true);
            we.StartEditOperation();
            IFeatureClassWrite fcWrite = result as IFeatureClassWrite;