https://www.2cto.com/kf/201302/188246.html
https://blog.csdn.net/bychentufeiyang/article/details/7081402
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https://www.2cto.com/kf/201302/188246.html
https://blog.csdn.net/bychentufeiyang/article/details/7081402
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]