当事件被提升一次时,c#事件处理程序被多次调用 [英] c# event handler is called multiple times when event is raised once
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问题描述
下面是我的代码,首先是我提出的事件,第二部分是我在另一个类中使用的地方。它似乎很直接,但日志显示即使事件被提升一次,该事件在消耗此事件的类上触发20多次。任何想法?
Below is my code, first is where I raise the event and second section is where I consume it in another class. It seems pretty straight forward, but the logs are showing that even though the event is raised once, the event is firing 20+ times on the class that consumes this event. Any ideas?
IBSerialPort
class:
public delegate void PacketReceivedHandler(object sender, PacketReceivedEventArgs e);
public event PacketReceivedHandler OnPacketReceived;
public class PacketReceivedEventArgs : EventArgs
{
public Packet PacketReceived { get; private set; }
public PacketReceivedEventArgs(Packet packet)
{
PacketReceived = packet;
}
}
// raise event
if (OnPacketReceived != null)
{
Log("This is only called ONCE!");
PacketReceivedEventArgs args = new PacketReceivedEventArgs(data);
OnPacketReceived(this, args);
}
使用 IBSerialPort
并消耗其 OnPacketReceived
事件:
IBSerialPort ibSerialPort = null;
..
if (ibSerialPort == null)
{
Log("This is only called once");
ibSerialPort = IBSerialPort.Instance;
ibSerialPort.OnPacketReceived += ibSerialPort_OnPacketReceived;
}
void ibSerialPort_OnPacketReceived(object sender, IBSerialPort.PacketReceivedEventArgs args)
{
Log("This is called ~25 times!!!!");
}
推荐答案
尝试这个,这将取消注册任何prev订阅者:
Try this, this will unregister any prev subscriber:
ibSerialPort.OnPacketReceived -= ibSerialPort_OnPacketReceived; // unregister
ibSerialPort.OnPacketReceived += ibSerialPort_OnPacketReceived; //register
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