Question

我正在尝试捕获触发了哪个事件。我有两个指向相同函数的事件CurrentLoan_LogEntryEvent。在CurrentLoan_LogEntryEvent内，如何确定实际触发了哪个事件：LogEntryAdded或LogEntryChange。

下面你会找到我的代码示例，我现在有了它。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。

如果你有一些常用的逻辑要执行，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，然后确定在该处理程序中执行的操作只会使事情过于复杂。

始终保持代码易于理解和更改。

查找哪个事件被解雇了

2 个答案: