您的绑定获得了 struct 的副本，因为结构是按值传递给方法的.如果绑定更新了一些东西；内存中某处的副本正在被修改，因此您的原始对象没有更新.

Your binding gets a copy of struct since structs are passed by value to methods. If the binding updates something; a copy in memory somewhere is being modified and hence the original object of yours is not updated.