设置实体类型中String类型的属性值为String.Empty

 　　　　 /// <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);
                     }
                 }
             }
         }