Breaking out of a foreach loop from within a switch block

Your solution is pretty much the most common option in this case. That being said, I’d put your exit check at the end:

bool exitLoop;
foreach (var v in myCollection)
{
    switch (v.id)
    {
        case 1:
            if (true)
            {
                exitLoop = true;
            }
            break;
        case 2;
            break
    }

    // This saves an iteration of the foreach...
    if (exitLoop) break;
}

The other main option is to refactor your code, and pull the switch statement and foreach loop out into a separate method. You could then just return from inside the switch statement.