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;
        }