coreXAML
（第27章）
MyDependencyObject obj = new MyDependencyObject();
obj.ValueChanged += (sender, e) =>
{
Console.WriteLine("value changed from {0} to {1}", e.OldValue, e.NewValue);
};
怎样理解下面这段代码
obj.ValueChanged += (sender, e) =>
{
Console.WriteLine("value changed from {0} to {1}", e.OldValue, e.NewValue);
};
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