遍历对象属性值

将对象内的属性以及属性值输出

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public static string ToProperties_V(this object obj)      {          if (obj == null) return "";          var s = obj.GetType();          StringBuilder app = new StringBuilder();          foreach (var item in s.GetProperties())          {              app.Append($"{item.Name}:{item.GetValue(obj)}\n");          }          return app.ToString().Trim(',');      }