ArcEngine创建要素类01

        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;
        }

        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;
        }