使用后台辅助角色进行异常处理

我知道这有点类似于后台工作者异常处理的问题，但它有点不同。

因此，根据我对 backgroundworker 的理解，当 dowork（） 方法中发生异常时，异常将传递给 RunWorkerCompleted（对象发送者，RunWorkerCompleteEventArgs e）中的e.Error。我的问题有几个部分。

1.） 在发生异常的行之后停止执行所有其他代码，然后传递给RunWorkerCompleted？是否有必要/最佳实践在DoWork()中使用 try/catch 来确保此行为？

2.） 从 DoWork() 或 RunWorkerCompleted() 方法内部抛出时，也会抛出异常。 例：

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
    try
    { 
       //Should I be putting code in this as well as getting the exception in `RunWorkerCompleted()`?
       //Or is the already how the background worker works already with out me needing to explicitly put the try/catch?  
    }
    catch (Exception ex)
    {
        throw ex; //is this throwing to the 'RunWorkerCompleted()` or outside the thread to error handling on in the thread where RunWorkerAsync() was called?
    } 
}
private void backgroundowrker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    if (e.Error != null
    {
        throw e.Error; //This throws it back to the thread that called `RunWorkerAsync()` right?
    }
}