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我设置使用下面的代码测试控制台应用程序:有没有办法“调整”事件监听器被调用的顺序?
using System;
class Program
{
static void Main(string[] args)
{
var myEventGenerator = new EventGenerator();
for (int i = 0; i < 10; i++)
new EventListener(myEventGenerator);
while (Console.ReadLine().Length == 0)
myEventGenerator.TriggerEvent();
}
}
class EventListener
{
private static int numberOfInstances = 0;
private int instanceNumber;
public EventListener(EventGenerator eg)
{
eg.EventHappened += EventHappened;
instanceNumber = numberOfInstances++;
}
void EventHappened(object sender, EventArgs e)
{
Console.WriteLine("Event Caught in Instance " + instanceNumber);
}
}
class EventGenerator
{
public event EventHandler EventHappened;
public void TriggerEvent()
{
Console.WriteLine("Event Begin");
if (EventHappened != null)
EventHappened.Invoke(this, new EventArgs());
Console.WriteLine("Event End");
}
}
和应用的输出为:
Event Begin
Event Caught in Instance 0
Event Caught in Instance 1
Event Caught in Instance 2
Event Caught in Instance 3
Event Caught in Instance 4
Event Caught in Instance 5
Event Caught in Instance 6
Event Caught in Instance 7
Event Caught in Instance 8
Event Caught in Instance 9
Event End
似乎事件侦听器是基于触发的顺序上,他们订阅的事件。
但是如果我不想让这些事件侦听器按照这个顺序发生怎么办?如果我想要它是随机的呢?或者,如果我想指定不同的顺序?有没有办法做到这一点?
+1链接。在那里执行的很好的例子描绘了代表们可能/不可能做到的事情。 –