/// <summary>

         ///  将String类型的属性值设置为String.Empty

         /// </summary>

         /// <typeparam name="T">强类型Entity</typeparam>

         /// <param name="result"></param>

         public static void DefaultStringProperty<T>(T result) where T : class

         {

             Type t = typeof(T);

             System.Reflection.PropertyInfo[] propertyInfos = t.GetProperties();

             foreach (PropertyInfo pi in propertyInfos)

             {

                 if (pi.PropertyType.Equals(typeof(string)))

                 {

                     object _origanlValue = pi.GetValue(result, null);

                     if (_origanlValue == null)

                     {

                         pi.SetValue(result, string.Empty, null);

                     }

                 }

             }

         }