全局处理问题：public static Model.SGGLDB db = Funs.DB;

SGGL/BLL/HSSE/EduTrain/TrainingPlanItemService.cs

@@ -10,7 +10,7 @@ namespace BLL
     /// </summary>
     public static class TrainingPlanItemService
     {
-        public static Model.SGGLDB db = Funs.DB;
+        
 
         /// <summary>
         /// 根据培训计划明细表Id获取所有相关明细信息
@@ -19,6 +19,7 @@ namespace BLL
         /// <returns></returns>
         public static List<Model.Training_PlanItem> GetPlanItemByPlanId(string planId)
         {
+            Model.SGGLDB db = Funs.DB;
             return (from x in db.Training_PlanItem where x.PlanId == planId select x).ToList();
         }
 
@@ -28,6 +29,7 @@ namespace BLL
         /// <param name="planItem"></param>
         public static void AddPlanItem(Model.Training_PlanItem planItem)
         {
+            Model.SGGLDB db = Funs.DB;
             Model.Training_PlanItem newPlanItem = new Model.Training_PlanItem
             {
                 PlanItemId = planItem.PlanItemId,
@@ -44,6 +46,7 @@ namespace BLL
         /// <param name="planItemId"></param>
         public static void DeletePlanItemById(string planItemId)
         {
+            Model.SGGLDB db = Funs.DB;
             var planItem = db.Training_PlanItem.FirstOrDefault(e => e.PlanItemId == planItemId);
             if (planItem != null)
             {