ArcEngine创建要素类

        public ESRI.ArcGIS.Geodatabase.IFeatureClass CreateFeatureClass(ESRI.ArcGIS.Geodatabase.IWorkspace2 workspace, ESRI.ArcGIS.Geodatabase.IFeatureDataset featureDataset, System.String featureClassName)
        {
            ESRI.ArcGIS.esriSystem.UID CLSID = null;
            ESRI.ArcGIS.esriSystem.UID CLSEXT = null;
            System.String strConfigKeyword = null;
            if (featureClassName == "") return null; // name was not passed in 

            ESRI.ArcGIS.Geodatabase.IFeatureClass featureClass;
            ESRI.ArcGIS.Geodatabase.IFeatureWorkspace featureWorkspace = (ESRI.ArcGIS.Geodatabase.IFeatureWorkspace)workspace; // Explicit Cast

            if (workspace.get_NameExists(ESRI.ArcGIS.Geodatabase.esriDatasetType.esriDTFeatureClass, featureClassName)) //feature class with that name already exists 
            {
                featureClass = featureWorkspace.OpenFeatureClass(featureClassName);
                return featureClass;
            }

            // assign the class id value if not assigned
            if (CLSID == null)
            {
                CLSID = new ESRI.ArcGIS.esriSystem.UIDClass();
                CLSID.Value = "esriGeoDatabase.Feature";
            }

            ESRI.ArcGIS.Geodatabase.IObjectClassDescription objectClassDescription = new ESRI.ArcGIS.Geodatabase.FeatureClassDescriptionClass();
            ESRI.ArcGIS.Geodatabase.IFields fields = null;
            // if a fields collection is not passed in then supply our own
            if (fields == null)
            {
                // create the fields using the required fields method
                fields = objectClassDescription.RequiredFields;
                ESRI.ArcGIS.Geodatabase.IFieldsEdit fieldsEdit = (ESRI.ArcGIS.Geodatabase.IFieldsEdit)fields; // Explicit Cast
                ESRI.ArcGIS.Geodatabase.IField field = new ESRI.ArcGIS.Geodatabase.FieldClass();

                // create a user defined text field
                ESRI.ArcGIS.Geodatabase.IFieldEdit fieldEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit)field; // Explicit Cast

                // setup field properties
                fieldEdit.Name_2 = "ZBDID";
                fieldEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeString;
                fieldEdit.IsNullable_2 = true;
                fieldEdit.AliasName_2 = "坐标编号";
                fieldEdit.DefaultValue_2 = "0";
                fieldEdit.Editable_2 = true;
                fieldEdit.Length_2 = 100;

                // add field to field collection
                fieldsEdit.AddField(field);
                fields = (ESRI.ArcGIS.Geodatabase.IFields)fieldsEdit; // Explicit Cast
            }

            System.String strShapeField = "";

            // locate the shape field
            for (int j = 0; j < fields.FieldCount; j++)
            {
                if (fields.get_Field(j).Type == ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeGeometry)
                {
                    strShapeField = fields.get_Field(j).Name;
                }
            }

            // Use IFieldChecker to create a validated fields collection.
            ESRI.ArcGIS.Geodatabase.IFieldChecker fieldChecker = new ESRI.ArcGIS.Geodatabase.FieldCheckerClass();
            ESRI.ArcGIS.Geodatabase.IEnumFieldError enumFieldError = null;
            ESRI.ArcGIS.Geodatabase.IFields validatedFields = null;
            fieldChecker.ValidateWorkspace = (ESRI.ArcGIS.Geodatabase.IWorkspace)workspace;
            fieldChecker.Validate(fields, out enumFieldError, out validatedFields);

            // The enumFieldError enumerator can be inspected at this point to determine 
            // which fields were modified during validation.


            // finally create and return the feature class
            if (featureDataset == null)// if no feature dataset passed in, create at the workspace level
            {
                featureClass = featureWorkspace.CreateFeatureClass(featureClassName, validatedFields, CLSID, CLSEXT, ESRI.ArcGIS.Geodatabase.esriFeatureType.esriFTSimple, strShapeField, strConfigKeyword);
            }
            else
            {
                featureClass = featureDataset.CreateFeatureClass(featureClassName, validatedFields, CLSID, CLSEXT, ESRI.ArcGIS.Geodatabase.esriFeatureType.esriFTSimple, strShapeField, strConfigKeyword);
            }
            return featureClass;
        }