Geodatabase - 创建要素类.

　　在NET中，会遇到以“_2”结尾的属性，这些属性是可写的.

　　以下代码在已有工作空间下,创建一个新的点要素类:

 //例如,personalDBPath=@"G:\doc\gis\1.400\data\pdb.mdb", featureClassName="newF"
 public void CreateFeatureClass(string personalDBPath, string featureClassName) {
             //创建点类型.
             //空间参考.
             ESRI.ArcGIS.Geometry.ISpatialReference sRef = mapCtrl_main.ActiveView.FocusMap.SpatialReference;

             ESRI.ArcGIS.Geodatabase.IGeometryDef geoDef = new ESRI.ArcGIS.Geodatabase.GeometryDefClass();
             ESRI.ArcGIS.Geodatabase.IGeometryDefEdit geoEdit = (ESRI.ArcGIS.Geodatabase.IGeometryDefEdit)geoDef;
             geoEdit.GeometryType_2 = ESRI.ArcGIS.Geometry.esriGeometryType.esriGeometryPoint;
             geoEdit.SpatialReference_2 = sRef;

             //字段集.
             ESRI.ArcGIS.Geodatabase.IFields fields = new ESRI.ArcGIS.Geodatabase.FieldsClass();
             ESRI.ArcGIS.Geodatabase.IFieldsEdit fieldsEdit = (ESRI.ArcGIS.Geodatabase.IFieldsEdit)fields;

             //逐一添加字段.

             ESRI.ArcGIS.Geodatabase.IField field = new ESRI.ArcGIS.Geodatabase.FieldClass();
             ESRI.ArcGIS.Geodatabase.IFieldEdit fieldEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit)field;
             fieldEdit.Name_2 = "SHAPE";
             fieldEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeGeometry;
             fieldEdit.GeometryDef_2 = geoDef;
             fieldsEdit.AddField(field);

             field = new ESRI.ArcGIS.Geodatabase.FieldClass();
             fieldEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit)field;
             fieldEdit.Name_2 = "STCD";
             fieldEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeString;
             fieldsEdit.AddField(field);

             field = new ESRI.ArcGIS.Geodatabase.FieldClass();
             fieldEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit)field;
             fieldEdit.Name_2 = "SLM10";
             fieldEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeString;
             fieldsEdit.AddField(field);

             field = new ESRI.ArcGIS.Geodatabase.FieldClass();
             fieldEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit)field;
             fieldEdit.Name_2 = "SLM20";
             fieldEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeString;
             fieldsEdit.AddField(field);

             field = new ESRI.ArcGIS.Geodatabase.FieldClass();
             fieldEdit = (ESRI.ArcGIS.Geodatabase.IFieldEdit)field;
             fieldEdit.Name_2 = "SLM40";
             fieldEdit.Type_2 = ESRI.ArcGIS.Geodatabase.esriFieldType.esriFieldTypeString;
             fieldsEdit.AddField(field);

             //通过已有工作空间创建.
             ESRI.ArcGIS.Geodatabase.IWorkspaceFactory wsf = new ESRI.ArcGIS.DataSourcesGDB.AccessWorkspaceFactory();
             ESRI.ArcGIS.Geodatabase.IFeatureWorkspace fws = (ESRI.ArcGIS.Geodatabase.IFeatureWorkspace)wsf.OpenFromFile(personalDBPath, );
             ESRI.ArcGIS.Geodatabase.IFeatureClass fc = fws.CreateFeatureClass(featureClassName, fields, null, null, ESRI.ArcGIS.Geodatabase.esriFeatureType.esriFTSimple, "SHAPE", null);
 }