BackgroundWorker 没有将 FileNotFoundException 传递给 RunWorkerCompleted

Question

我正在处理一个 WinForms 项目，有时我必须在后台加载一个 XmlDocument。我有一个 BackgroundWorker 执行此操作，但是当找不到 XmlDocument 时，BackgroundWorker 在 DoWork 中抛出一个 System.IO.FileNotFoundException 而不是将其传递给 RunWorkerCompleted。

private void LoadBgWorker_DoWork(object sender, DoWorkEventArgs e)
        {
            //---download manifest---
            SetStatusText("Downloading manifest...");
            Manifest = new System.Xml.XmlDocument();
            Manifest.Load(Properties.Resources.ManifestUrl); // <-- this is where the code gets stuck, it alerts me that the exception is unhandled
        }

private void LoadBgWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (e.Error != null)
            {
                Success = false;
                Error = e.Error;
                this.Close();
            }
            else
            {
                //---loading complete, close form---
                Success = true;
                this.Close();
            }
        }

我是不是漏掉了什么？异常不应该自动触发 RunWorkerCompleted 以便在那里处理吗？

Answer 1

您是否检查过是否在例外设置中勾选了 System.IO.FileNotFoundException "Break when thrown"？

可能是这样，因为 backgroundworker DoWork 会在抛出时捕获异常。

来自微软（full article here）：

Tell the debugger to break when an exception is thrown

The debugger can break execution at the point where an exception is thrown, so you may examine the exception before a handler is invoked.

In the Exception Settings window (Debug > Windows > Exception Settings), expand the node for a category of exceptions, such as Common Language Runtime Exceptions. Then select the check box for a specific exception within that category, such as System.AccessViolationException. You can also select an entire category of exceptions.

BackgroundWorker 没有将 FileNotFoundException 传递给 RunWorkerCompleted

BackgroundWorker not passing FileNotFoundException to RunWorkerCompleted

c#

winforms

backgroundworker