IDE并不知晓什么类型的对象将要绑定到数据上下文中，这就意味着它没法检查绑定错误。
The IDE has no way of knowing what type of object is going to be bound to the data-context, which in turn means it can't examine the bindings for errors.
实际上有两种错误消息类型：在捆绑html表单的时候根据类型生成的，和提交后表单元素绑定的类生成的。
There are actually two types of validation error messages - those generated before the HTML form fields are bound to a class and those generated after the form fields are bound to the class.
Generictypeparameterdeclaredwithafinal typebound编译器每当遇到一个涉及final类型的类型绑定时，就会发出一个错误或者警告。
Generic type parameter declared with a final type bound The compiler will issue an error or warning whenever it encounters a type bound involving a final type. Consider this sample method signature.
Generictypeparameterdeclaredwithafinal typebound编译器每当遇到一个涉及final类型的类型绑定时，就会发出一个错误或者警告。
Generic type parameter declared with a final type bound The compiler will issue an error or warning whenever it encounters a type bound involving a final type. Consider this sample method signature.
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