修复导入excel，无操作时停顿5秒

AppStart/ExcelHelper.cs

@@ -1372,6 +1372,10 @@ namespace MySystem
                         db.Dispose();
                     }
                 }
+                else
+                {
+                    Thread.Sleep(5000);
+                }
                 // return "success|" + SuccessCount;
             }
         }

AppStart/OpExcelHelper.cs

@@ -242,6 +242,10 @@ namespace MySystem
                         db.Dispose();
                     }
                 }
+                else
+                {
+                    Thread.Sleep(5000);
+                }
                 // return "success|" + SuccessCount;
             }
         }