代码说明： TPolymorphicList is a non-visual component with TList funcionality. Objects stored in this list can be saved/retrieved to/from streams. Stored objects must descend from TPersistent. Published object properties are stored using Delphi streaming capabilities. Can be used to save objects to files or database blob fields. Can also be used in conjunction with components like Pythoness PSetting or Delphi VCL Extensions (RX) Lib TFormStorage to save application runtime state. 有TList功能的非可视组件

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