SmartReactives表达式值检测
SmartReactives 是 Rx.NET 的扩展，用来检测一个表达式的值是否有变化，通过 IObservable 接口来检测。简单的示例代码：
var input = new ReactiveVariable<int>(1);
var square = new ReactiveExpression<int>(() => input.Value * input.Value);
square.Subscribe(getSquare => Console.WriteLine("square = " + getSquare())); //Prints 'square = 1'
input.Value = 2; //Prints 'square = 4'
input.Value = 3; //Prints 'square = 9'SmartReactives 灵感来自于 Scala.Rx
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