ArcEngine创建内存FeatureClass

public static IFeatureClass CreateMemoryFeatureClass(            ISpatialReference spatialReference, esriGeometryType geometryType, string name = "Temp")        {            // 创建内存工作空间            IWorkspaceFactory pWSF = new InMemoryWorkspaceFactoryClass();            IWorkspaceName pWSName = pWSF.Create("", "Temp", null, 0);            IName pName = (IName)pWSName;            IWorkspace memoryWS = (IWorkspace)pName.Open();            IField field = new FieldClass();            IFields fields = new FieldsClass();            IFieldsEdit fieldsEdit = fields as IFieldsEdit;            IFieldEdit fieldEdit = field as IFieldEdit;            fieldEdit.Name_2 = "OBJECTID";            fieldEdit.Type_2 = esriFieldType.esriFieldTypeOID;            fieldEdit.IsNullable_2 = false;            fieldEdit.Required_2 = false;            fieldsEdit.AddField(field);            field = new FieldClass();            fieldEdit = field as IFieldEdit;            IGeometryDef geoDef = new GeometryDefClass();            IGeometryDefEdit geoDefEdit = (IGeometryDefEdit)geoDef;            geoDefEdit.AvgNumPoints_2 = 5;            geoDefEdit.GeometryType_2 = geometryType;            geoDefEdit.GridCount_2 = 1;            geoDefEdit.HasM_2 = false;            geoDefEdit.HasZ_2 = false;            geoDefEdit.SpatialReference_2 = spatialReference;            fieldEdit.Name_2 = "SHAPE";            fieldEdit.Type_2 = esriFieldType.esriFieldTypeGeometry;            fieldEdit.GeometryDef_2 = geoDef;            fieldEdit.IsNullable_2 = true;            fieldEdit.Required_2 = true;            fieldsEdit.AddField(field);            field = new FieldClass();            fieldEdit = field as IFieldEdit;            fieldEdit.Name_2 = "Code";            fieldEdit.Type_2 = esriFieldType.esriFieldTypeSmallInteger;            fieldEdit.IsNullable_2 = true;            fieldsEdit.AddField(field);            //创建要素类            IFeatureWorkspace featureWorkspace = (IFeatureWorkspace)memoryWS;            IFeatureClass featureClass = featureWorkspace.CreateFeatureClass(                name, fields, null, null, esriFeatureType.esriFTSimple, "SHAPE", "");            return featureClass;        }