The invocation handler class is where all of the data validation logic is handled.

调用处理程序类是处理所有数据验证逻辑的地方。

youdao

This problem is actually a special case of a much larger class of problems related to user input validation.

这个问题实际上是与用户输入验证相关的一类更大问题的一个特例。

youdao

Because our example application included a business delegate class, we placed the validation logic there.

因为示例应用程序包含了一个业务委派类，所以我们在其中放置了验证逻辑。

youdao

Dr. Aaron Kaplan is a friend of ours, a successful interventional cardiologist and medical device entrepreneur, who talks about this challenge in market validation when he speaks in our class.

FORBES: Are You Making Something Usable? Part 6 -- How to do it.