public ESRI.ArcGIS.Geodatabase.IFeatureClass CreateFeatureClassForLine(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 Castif (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 assignedif (CLSID == null){CLSID = new ESRI.ArcGIS.esriSystem.UIDClass();CLSID.Value = "esriGeoDatabase.Feature";//CLSID.Value = "esriGeometryType.esriGeometryPolyline";
            }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 ownif (fields == null){// create the fields using the required fields methodfields = objectClassDescription.RequiredFields;ESRI.ArcGIS.Geodatabase.IFieldsEdit fieldsEdit = (ESRI.ArcGIS.Geodatabase.IFieldsEdit)fields; // Explicit CastESRI.ArcGIS.Geodatabase.IField field = new ESRI.ArcGIS.Geodatabase.FieldClass();// create a user defined text fieldESRI.ArcGIS.Geodatabase.IFieldEdit fieldEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit)field; // Explicit Cast// setup field propertiesfieldEdit.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 fieldfor (int j = 0; j < fields.FieldCount; j++){if (fields.get_Field(j).Type == ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeGeometry){//strShapeField = fields.get_Field(j).Name;IField shapeField = fields.get_Field(j);strShapeField = fields.get_Field(j).Name;IGeometryDef geometryDef = shapeField.GeometryDef;IGeometryDefEdit geometryDefEdit = (IGeometryDefEdit)geometryDef;// Alter the feature class geometry type to lines (default is polygons).geometryDefEdit.GeometryType_2 = esriGeometryType.esriGeometryPolyline;  geometryDefEdit.HasM_2 = true;//true 则带有Z坐标，false 不带Z坐标geometryDefEdit.GridCount_2 = 1;// Set the first grid size to zero and allow ArcGIS to determine a valid grid size.geometryDefEdit.set_GridSize(0, 0);ISpatialReferenceFactory3 spatialReferenceFactory = new SpatialReferenceEnvironmentClass();geometryDefEdit.SpatialReference_2 = spatialReferenceFactory.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_Beijing1954);break;}}// 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 classif (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;}