C#不会捕获“嵌套”自定义异常[重复]

我试图捕捉“嵌套”或“封装”自定义错误( I504Error )在我的代码中。我知道这通常不是最佳实践,但它应该适用于我的用例,因为错误非常具体。我正在试着得到 try/catch 拦截以捕捉 I504错误 在我的 Main 方法,但它没有捕获它,即使它是从 尝试/抓住 块我的程序只是在抛出错误的地方停止。我做错了什么?

// Custom Error Handler
public class I504Error : Exception
{
    public I504Error()
    {
    }
}

// Classes

public abstract class AbstractIternetThing
{
    public abstract void DoSomething();
}

public class IternetThing : AbstractIternetThing
{
    public override void DoSomething()
    {
        // bunch of other stuff
        if (iternetThingWorkedProperly == false)
        {
            // Program stops here, doesn't get caught by the try/catch block in Program.Main()
            throw new I504Error();
        }
    }
}

// Main script
class Pogram
{
    static void Main(string[] args)
    {
        List<Task<AbstractIternetThing>> programThreads = new List<Task<AbstractIternetThing>>();
        IternetThing iThing = new IternetThing();

        try
        {
            for (int wantedThread = 0; wantedThread < 5; wantedThread++)
            {
                Task<AbstractIternetThing> iThingTask = new Task<AbstractIternetThing>(() => iThing.DoSomething());
                iThingTask.Start();
            }
        }
        // The Error should get caught here, but it doesnt?
        catch (I504Error)
        {
            // Do something else
        }
    }
}