Catching errors in parallel foreach loops

With parallel foreach loops, developers can wrap the loop in a try catch statement. Care needs to be taken, however, because the Parallel.ForEach will throw AggregatedException, which has the exceptions it encounters over several threads rolled into one.

Getting ready

We will create a List<string> object that contains a collection of machine IP addresses. The Parallel.ForEach loop will check the IP addresses to see whether the machines on the other end of the given IP are alive. It does this by pinging the IP address. The method that performs the Parallel.ForEach loop will also be given the minimum required alive machines as an integer value. If the minimum number of machines alive is not met, an exception is thrown.

How to do it…

1. In the Recipes class, add a method called CheckClientMachinesOnline() that takes as parameters a List<string> collection of IP addresses and an integer that specifies the minimum number of machines required to be...