如何在。net 4.0中从continuation任务中传播任务异常?

I have the following code:

我有以下代码:

innerExceptions = dbconnByServer
    .AsParallel()
    .WithDegreeOfParallelism(dbconnByServer.Count)
    // A stream of groups of server connections proceeding in parallel per server
    .Select(dbconns => dbconns.Select(dbconn => m_sqlUtilProvider.Get(dbconn)))
    // A stream of groups of SqlUtil objects proceeding in parallel per server
    .Select(sqlUtils => GetTaskException(sqlUtils
        // Aggregate SqlUtil objects to form a single Task which runs the SQL asynchronously for the first SqlUtil, then upon completion
        // for the next SqlUtil and so long until all the SqlUtil objects are processed asynchronously one after another.
        .Aggregate<ISqlUtil, Task>(null, (res, sqlUtil) =>
        {
            if (res == null)
            {
                return sqlUtil.ExecuteSqlAsync(SQL, parameters);
            }
            return res.ContinueWith(_ => sqlUtil.ExecuteSqlAsync(SQL, parameters)).Unwrap();
        })))
    .Where(e => e != null)
    .ToList();
innerExc