不够5个单，不计算平均值

AutoTurnOver.Models/dc_average_purchase.cs

@@ -45,5 +45,7 @@ namespace AutoTurnOver.Models
         public DateTime update_time { get; set; }
 
         public int payment_type { get; set; }
+
+        public int? virtual_delivery_days { get; set; }
     }
 }

AutoTurnOver.Services/PurchaseAverageTargetServices.cs

@@ -52,8 +52,12 @@ namespace AutoTurnOver.Services
                     // 查询相关采购单
                     var purchaseList = AveragePurchase.GetPurchaseList(skuItem, _seed_count).ToList();
 
-                    //有相关采购单 (有不止一个单，才算平均数)
-                    if (purchaseList != null && purchaseList.Select(s => s.purchase_id).Distinct().Count() > 1)
+                   
+                    //查出来的采购单数量
+                    var purchase_order_count = purchaseList.Select(s => s.purchase_id).Distinct().Count();
+
+                    //有相关采购单 (要至少有3个单，才算平均数)
+                    if (purchaseList != null && purchase_order_count >= 3)
                     {
                         data.supplier_name = purchaseList[0].supplier_name;
 
@@ -80,7 +84,18 @@ namespace AutoTurnOver.Services
                         }
 
                         // 平均采购交期
-                        data.delivery_days = delivery_days / purchaseList.Count;
+                        var temp_delivery_days = delivery_days / purchaseList.Count;
+                        //够5个单才算平均值给系统用
+                        if (purchase_order_count >= 5)
+                        {
+                            data.delivery_days = temp_delivery_days;
+                        }
+                        else
+                        {
+                            // 不够5个单不算这个值
+                            data.delivery_days = 0;
+                        }
+                        data.virtual_delivery_days = temp_delivery_days;
                         data.payment_type = purchaseList.Any(s => s.pay_type == 1) ? 1 : 2;