XAML 2009将完全支持泛型、非默认构造方法、工厂方法、内建类型并且可以定义新的属性。

In XAML 2009 we see full support for generics, non-default constructors, factory methods, built-in types, and defining new properties.

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因此，当类型参数t用作泛型类的超类时，T的注释确切地告知我们可以调用哪些超级构造函数。

Thus, when a type parameter t is used as the superclass of a generic class, the annotation on t tells us exactly what super-constructors we can call.

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不幸的是，您不能用通配符类型的参数调用泛型构造函数，即使知道存在这样的构造函数也不行。

Unfortunately, you can't invoke a generic constructor with a wildcard type argument, even though you know such a constructor exists. However, you can do this.

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