LinQ多字段排序的误区，代码本身不报错，但是得不到应有的效果，此处列出了我测试的几个方法，只有第一个是对的

            //正确
            var weldtable = (from tt in database.NDEWeldingCheckData
                             where tt.IsDelete == false && tt.FK_TasComID == jobnoid
                             select tt
                             )
                             .OrderBy(p => p.SpaType)
                             .ThenBy(p => p.WeldingCheckTypeGoup)
                             .ThenBy(p => p.OrderNumber);
            //错误
            var weldtable = (from tt in database.NDEWeldingCheckData
                             where tt.IsDelete == false && tt.FK_TasComID == jobnoid
                             orderby tt.SpaType, tt.WeldingCheckTypeGoup, tt.OrderNumber
                             select tt
                             );
            //错误
            var weldtable = (from tt in database.NDEWeldingCheckData
                             where tt.IsDelete == false && tt.FK_TasComID == jobnoid
                             orderby tt.SpaType
                             orderby tt.WeldingCheckTypeGoup
                             orderby tt.OrderNumber
                             select tt
                             );