C # 语言委托相等性
示例
调用委托按引用相等进行比较：.Equals()
Action action1 = () => Console.WriteLine("Hello delegates");
Action action2 = () => Console.WriteLine("Hello delegates");
Action action1Again = action1;
Console.WriteLine(action1.Equals(action1)) //真正
Console.WriteLine(action1.Equals(action2)) //假
Console.WriteLine(action1Again.Equals(action1)) //真正这些规则在进行多播委托时+=或-=在多播委托上也适用，例如，订阅和取消订阅事件时。
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