How to Catch Exceptions from Separate Threads in .NET?

Catch Exceptions Thrown in a Separate Thread

In multithreaded applications, it's crucial to handle exceptions that occur in separate threads. This guide will demonstrate two approaches to accomplish this.

Task-Based Exception Handling in .NET 4 and Above

Consider using Task instead of creating new threads. With Task, exceptions can be retrieved via the .Exceptions property. Here are two ways to do it:

• In a Separate Method:

Task<int> task = new Task<int>(Test);
task.ContinueWith(ExceptionHandler, TaskContinuationOptions.OnlyOnFaulted);
task.Start();
...

static void ExceptionHandler(Task<int> task)
{
    Console.WriteLine(task.Exception.Message);
}

• In the Same Method:

Task<int> task = new Task<int>(Test);
task.Start();

try
{
    task.Wait();
}
catch (AggregateException ex)
{
    Console.WriteLine(ex);
}

Exception Handling in .NET 3.5

For .NET 3.5, consider the following approaches:

• In the Child's Thread:

Exception exception = null;
Thread thread = new Thread(() => Test(0, 0));
thread.Start();

thread.Join();

if (exception != null)
    Console.WriteLine(exception);

• In the Caller's Thread:

Exception exception = null;
Thread thread = new Thread(() =>
{
    try
    {
        Test(0, 0);
    }
    catch (Exception ex)
    {
        lock (exceptionLock)
        {
            exception = ex;
        }
    }
});
thread.Start();
thread.Join();

if (exception != null)
    Console.WriteLine(exception);

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