单独生成要素类：

public IFeatureClass CreateStandaloneFeatureClass(IWorkspace workspace, String    featureClassName, IFields fieldsCollection, String shapeFieldName)        {            IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)workspace;            IFeatureClassDescription fcDesc = new FeatureClassDescriptionClass();            IObjectClassDescription ocDesc = (IObjectClassDescription)fcDesc;            // Use IFieldChecker to create a validated fields collection.            IFieldChecker fieldChecker = new FieldCheckerClass();            IEnumFieldError enumFieldError = null; IFields validatedFields = null;            fieldChecker.ValidateWorkspace = workspace;            fieldChecker.Validate(fieldsCollection, out enumFieldError, out validatedFields);            // The enumFieldError enumerator can be inspected at this point to determine             // which fields were modified during validation.            IFeatureClass featureClass = featureWorkspace.CreateFeatureClass                (featureClassName, validatedFields, ocDesc.InstanceCLSID,                ocDesc.ClassExtensionCLSID, esriFeatureType.esriFTSimple, shapeFieldName, "");             return featureClass;        }

在要素集中添加要素类：

public IFeatureClass CreateFeatureDatasetFeatureClass(IFeatureDataset featureDataset,            String featureClassName, IFields fieldsCollection, String shapeFieldName)        {            IFeatureClassDescription fcDesc = new FeatureClassDescriptionClass();            IObjectClassDescription ocDesc = (IObjectClassDescription)fcDesc;            // Use IFieldChecker to create a validated fields collection.            IFieldChecker fieldChecker = new FieldCheckerClass();            IEnumFieldError enumFieldError = null;            IFields validatedFields = null;            fieldChecker.ValidateWorkspace = featureDataset.Workspace;            fieldChecker.Validate(fieldsCollection, out enumFieldError, out validatedFields);            // The enumFieldError enumerator can be inspected at this point to determine             // which fields were modified during validation.            IFeatureClass featureClass = featureDataset.CreateFeatureClass(featureClassName,                validatedFields, ocDesc.InstanceCLSID, ocDesc.ClassExtensionCLSID,                esriFeatureType.esriFTSimple, fcDesc.ShapeFieldName, "");            return featureClass;        }

 创建不同类型的要素类：

可以修改，主要是修改validatedFields，IFields字段有一个是关于要素类几何类型的，比如：IGeometryDef pGeoDef = new GeometryDefClass();            IGeometryDefEdit pGeoDefEdit = pGeoDef as IGeometryDefEdit;            pGeoDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPoint;  //指定创建的要素类的要素类型            pGeoDefEdit.SpatialReference_2 = spatialReference;  //设置要素类的空间参考           // pSpatialReference.SetDomain(0, 99999999, 0, 9999999);            //定义一个字段集合对象            IFields pFields = new FieldsClass();            IFieldsEdit pFieldsEdit = (IFieldsEdit)pFields;            //定义单个的字段            IField pField = new FieldClass();            IFieldEdit pFieldEdit = (IFieldEdit)pField;            pFieldEdit.Name_2 = "SHAPE";            pFieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;                      pFieldEdit.GeometryDef_2 = pGeoDef;  pFieldsEdit.AddField(pField);