新增違規次數多的API

WebApi_data_value/Controllers/Violation_car_tableController.cs

@@ -179,6 +179,31 @@ namespace WebApi_data_value.Controllers
         }
         #endregion
 
+        #region
+        /// <summary>
+        /// 尋找違規次數最多
+        /// </summary>
+        /// <returns></returns>
+        [HttpGet("recidivists")]
+        public async Task<IEnumerable<object>> GetRecidivists()
+        {
+
+            var plateNumberOccurrences = await _context.violation_car_table
+                                            .GroupBy(c => c.license_plate_number)
+                                            .Select(group => new
+                                            {
+                                                LicensePlateNumber = group.Key,
+                                                Occurrences = group.Count()
+                                            })
+                                            .OrderByDescending(x => x.Occurrences)
+                                            .ToListAsync();
+
+
+            return plateNumberOccurrences;
+        }
+        #endregion
+
+
         #region 新增違規車輛
         /// <summary>
         /// 新增違規車輛