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

SGGL/BLL/Common/AttachFileService.cs

@@ -12,7 +12,7 @@ namespace BLL
 {
     public static class AttachFileService
     {
-        public static Model.SGGLDB db = Funs.DB;
+        
 
         /// <summary>
         /// 添加附件存储信息
@@ -20,6 +20,7 @@ namespace BLL
         /// <param name="workArea"></param>
         public static void AddAttachFile(Model.AttachFile attachFile)
         {
+            Model.SGGLDB db = Funs.DB;
             string newKeyID = SQLHelper.GetNewID(typeof(Model.AttachFile));
             Model.AttachFile newAttachFile = new Model.AttachFile();
             newAttachFile.AttachFileId = newKeyID;
@@ -38,6 +39,7 @@ namespace BLL
         /// <param name="workArea"></param>
         public static void updateAttachFile(Model.AttachFile attachFile)
         {
+            Model.SGGLDB db = Funs.DB;
             Model.AttachFile newAttachFile = db.AttachFile.FirstOrDefault(x => x.AttachFileId == attachFile.AttachFileId);
             newAttachFile.ToKeyId = attachFile.ToKeyId;
             newAttachFile.AttachSource = attachFile.AttachSource;
@@ -53,6 +55,7 @@ namespace BLL
         /// <param name="workAreaId"></param>
         public static void DeleteAttachFile(string rootPath, string toKeyId, string menuId)
         {
+            Model.SGGLDB db = Funs.DB;
             Model.AttachFile att = db.AttachFile.FirstOrDefault(e => e.ToKeyId == toKeyId && e.MenuId == menuId);
             if (att != null)
             {