/// <summary>
/// Returns the <see cref="AggregateException"/> that is the root cause of this exception.
/// </summary>
public override Exception GetBaseException()
{
// Returns the first inner AggregateException that contains more or less than one inner exception
// Recursively traverse the inner exceptions as long as the inner exception of type AggregateException and has only one inner exception
Exception back = this;
AggregateException backAsAggregate = this;
while (backAsAggregate != null && backAsAggregate.InnerExceptions.Count == 1)
{
back = back.InnerException;
backAsAggregate = back as AggregateException;
}
return(back);
}
/// <summary>
/// Flattens an <see cref="AggregateException"/> instances into a single, new instance.
/// </summary>
/// <returns>A new, flattened <see cref="AggregateException"/>.</returns>
/// <remarks>
/// If any inner exceptions are themselves instances of
/// <see cref="AggregateException"/>, this method will recursively flatten all of them. The
/// inner exceptions returned in the new <see cref="AggregateException"/>
/// will be the union of all of the the inner exceptions from exception tree rooted at the provided
/// <see cref="AggregateException"/> instance.
/// </remarks>
public AggregateException Flatten()
{
// Initialize a collection to contain the flattened exceptions.
List <Exception> flattenedExceptions = new List <Exception>();
// Create a list to remember all aggregates to be flattened, this will be accessed like a FIFO queue
List <AggregateException> exceptionsToFlatten = new List <AggregateException> {
this
};
Int32 nDequeueIndex = 0;
// Continue removing and recursively flattening exceptions, until there are no more.
while (exceptionsToFlatten.Count > nDequeueIndex)
{
// dequeue one from exceptionsToFlatten
IList <Exception> currentInnerExceptions = exceptionsToFlatten[nDequeueIndex++].InnerExceptions;
for (Int32 i = 0; i < currentInnerExceptions.Count; i++)
{
Exception currentInnerException = currentInnerExceptions[i];
if (currentInnerException == null)
{
continue;
}
AggregateException currentInnerAsAggregate = currentInnerException as AggregateException;
// If this exception is an aggregate, keep it around for later. Otherwise,
// simply add it to the list of flattened exceptions to be returned.
if (currentInnerAsAggregate != null)
{
exceptionsToFlatten.Add(currentInnerAsAggregate);
}
else
{
flattenedExceptions.Add(currentInnerException);
}
}
}
return(new AggregateException(Message, flattenedExceptions));
}
