如何在运行时检测程序是否在抛出的异常下执行?

有一个可怕的黑客 Marshal.GetExceptionPointers Marshal.GetExceptionCode 这并不是在所有的平台上都适用,而是:

public static Boolean IsInException()
{
   return Marshal.GetExceptionPointers() != IntPtr.Zero ||
          Marshal.GetExceptionCode() != 0;
}

从此页开始: http://www.codewrecks.com/blog/index.php/2008/07/25/detecting-if-finally-block-is-executing-for-an-manhandled-exception/

我想不出你为什么不这样做:

private void Helper(bool exceptionWasCaught)
{
    //...
}

我不知道。这很麻烦,但它充分说明了开发人员的意图:

private bool inException = false;

public void MyFunc1()
{
  try
  {
    inException = false;

    // some code here that eventaully throws an exception
  }
  catch( Exception ex )
  {
     inException = true;
     Helper();
  }
}

public void MyFunc2()
{
   inException = false;
   Helper();
}

private void Helper()
{
    // how can I check if program execution is the  
    // result of a thrown exception here.
    if (inException)
    {
        // do things.
    }
}

为什么不更改Helper()方法的签名?

public void MyFunc1()
{
  try
  {
    // some code here that eventually throws an exception
  }
  catch( Exception ex )
  {
     Helper(ex);
  }
}

private void Helper(Exception ex = null)
{
    // result of a thrown exception here.
    if (ex!=null)
    {
        // do things.
    } else {
        // do other things
    }
}