查找哪个事件被解雇了

Question

我试图捕获哪个事件被触发.我有两个指向相同功能的事件CurrentLoan_LogEntryEvent.在里面CurrentLoan_LogEntryEvent,我如何确定实际触发了哪个事件:LogEntryAdded或LogEntryChange.

您可以在下面找到我的代码示例.如果您对我的代码有任何疑问,请与我们联系.

CurrentLoan是一个Loan对象,它有两个事件.

public MyApplication()
{
    ThirdPartyDLL.LoanOpened += new EventHandler(CurrentLoanOpened);
}

private void CurrentLoanOpened(object sender, EventArgs e) 
{
    ThirdPartyDLL.CurrentLoan.LogEntryAdded += CurrentLoan_LogEntryEvent;
    ThirdPartyDLL.CurrentLoan.LogEntryChange += CurrentLoan_LogEntryEvent;
}

private void CurrentLoan_LogEntryEvent(object sender, LogEntryEventArgs e)
{
    // When LogEntry was Added or Changed.
    // How do I determine if LogEntryAdded or LogEntryChange was fired?
}

Answer 1

如果要区分两个事件,则无法为多个事件附加单个方法.给他们不同的处理程序.

当您不关心事件来源的位置时,通常会为多个事件附加单个处理程序,但您始终希望在处理程序中执行相同的操作.

如果你有一些常见的逻辑要执行,你可以在处理程序中调用它.

private void CurrentLoanOpened(object sender, EventArgs e) 
{
    ThirdPartyDLL.CurrentLoan.LogEntryAdded += CurrentLoan_LogEntryAdded;
    ThirdPartyDLL.CurrentLoan.LogEntryChange += CurrentLoan_LogEntryChange;
}

private void CurrentLoan_LogEntryAdded(object sender, LogEntryEventArgs e)
{
    //LogEntryAdded fired
    YourOptionalCommonMethodIfAny();
}

private void CurrentLoan_LogEntryChange(object sender, LogEntryEventArgs e)
{
    //LogEntryChange fired
    YourOptionalCommonMethodIfAny();
}

Answer 2

你为什么不简单地这样做：

private void CurrentLoanOpened(object sender, EventArgs e) 
{
    ThirdPartyDLL.CurrentLoan.LogEntryAdded += CurrentLoan_LogEntryAddedEvent;
    ThirdPartyDLL.CurrentLoan.LogEntryChange += CurrentLoan_LogEntryChangeEvent;
}

private void CurrentLoan_LogEntryAddedEvent(object sender, LogEntryEventArgs e)
{
    // First do what you must do specifically for added events
    CurrentLoan_LogEntry(e);
}


private void CurrentLoan_LogEntryChangeEvent(object sender, LogEntryEventArgs e)
{
    // First do what you must do specifically for changed events
    CurrentLoan_LogEntry(e);
}

将一个处理程序绑定到多个事件，然后弄清楚该处理程序内部要做什么，这只会使事情变得过于复杂。

始终保持您的代码尽可能简单，易于理解和更改。