如何在不使用 Rx 框架的情况下限制事件的速度

How to throttle the speed of an event without using Rx Framework(如何在不使用 Rx 框架的情况下限制事件的速度)

问题描述

我想限制事件的速度，如何在不使用 Microsoft Rx 框架的情况下实现这一点.我在 Rx 的帮助下完成了这项工作.但我正在尝试的是，我需要根据时隙限制 Map 的 View changed 事件.是否可以在不使用 Rx 的情况下实现相同的功能.

I want to throttle the speed of an event, How I can achieve this without using Microsoft Rx framework. I had done this with the help of Rx. But what I am trying is, I need to throttle Map's View changed event based on a time slot. Is it possible to implement the same without using Rx.

我不允许使用 Rx，我必须保持二进制大小尽可能小.

I am not allowed to use Rx and I have to keep the binary size as small as possible.

推荐答案

例如，如果您的事件是 EventHandler 类型，则此方法有效.它为你的事件处理程序创建了一个被限制的包装器:

This works, if your event is of type EventHandler<EventArgs> for example. It creates a wrapper for your event handler that is throttled:

private EventHandler<EventArgs> CreateThrottledEventHandler(
    EventHandler<EventArgs> handler, 
    TimeSpan throttle)
{   
    bool throttling = false;
    return (s,e) =>
    {
        if(throttling) return;              
        handler(s,e);
        throttling = true;
        Task.Delay(throttle).ContinueWith(_ => throttling = false);
    };
}

像这样附加:

this.SomeEvent += CreateThrottledEventHandler(
    (s,e) => Console.WriteLine("I am throttled!"),
    TimeSpan.FromSeconds(5));

不过，如果您以后需要使用 -= 取消连接，则应该存储从 CreateThrottledEventHandler 返回的处理程序.

Although, you should store the handler returned from CreateThrottledEventHandler if you need to unwire it with -= later.

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