Getting all messages from InnerException(s)?

Question

Is there any way to write a LINQ style \"short hand\" code for walking to all levels of InnerException(s) of Exception thrown? I would prefer to write it in place instead of

Answer 1

Most solutions presended here have the following implementation errors:

• handle null exceptions
• handle the inner exceptions of AggregateException
• define a max depth for recurse inner exceptions (ie. with circular dependencies)

A better implementation is this here:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

public static string AggregateMessages(this Exception ex) =>
    ex.GetInnerExceptions()
        .Aggregate(
            new StringBuilder(),
            (sb, e) => sb.AppendLine(e.Message),
            sb => sb.ToString());

public static IEnumerable GetInnerExceptions(this Exception ex, int maxDepth = 5)
{
    if (ex == null || maxDepth <= 0)
    {
        yield break;
    }

    yield return ex;

    if (ex is AggregateException ax)
    {
        foreach(var i in ax.InnerExceptions.SelectMany(ie => GetInnerExceptions(ie, maxDepth - 1)))
            yield return i;
    }

    foreach (var i in GetInnerExceptions(ex.InnerException, maxDepth - 1))
        yield return i;
}

Example usage:

try
{
    // ...
}
catch(Exception e)
{
    Log.Error(e, e.AggregateMessages());
}