Error dialog for several parallel operations

1. How do you handle errors in parallel ForEach?
2. How do you wait for parallel ForEach to complete?
3. How to use parallel ForEach in C#?
4. How to handle exceptions in task C#?

How do you handle errors in parallel ForEach?

For and Parallel. ForEach overloads do not have any special mechanism to handle exceptions that might be thrown. In this respect, they resemble regular for and foreach loops ( For and For Each in Visual Basic); an unhandled exception causes the loop to terminate as soon as all currently running iterations finish.

How do you wait for parallel ForEach to complete?

You don't have to do anything special, Parallel. Foreach() will wait until all its branched tasks are complete. From the calling thread you can treat it as a single synchronous statement and for instance wrap it inside a try/catch.

How to use parallel ForEach in C#?

Parallel. ForEach is like the foreach loop in C#, except the foreach loop runs on a single thread and processing take place sequentially, while the Parallel. ForEach loop runs on multiple threads and the processing takes place in a parallel manner.

How to handle exceptions in task C#?

Tasks Module Example Public Sub Main() Dim task1 = Task. Run(Sub() Throw New CustomException("This exception is expected!")) Try task1. Wait() Catch ae As AggregateException ' Call the Handle method to handle the custom exception, ' otherwise rethrow the exception.