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App Inventor 2 MQTT拓展入门（保姆级教程） · App Inventor 2 中文网
...) 等。有一定基础的可以考虑用英文平台。
其实，使用哪个平台都可以，甚至自己搭建MQTT服务器，用自己的平台。不过初学者还是建议用国内中文平台进行测试，熟悉之后可以研究一下其他的或者自己搭建。
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How to COUNT rows within EntityFramework without loading contents?
...electMany(o => o.MyTable)
.Count()
Both generate the same SQL query.
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Update 2
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