相关疑难解决方法(0)

这是处理BackGroundWorker的正确方法吗？我不确定在调用.Dispose()之前是否需要删除事件.还在RunWorkerCompleted委托中调用.Dispose()确定吗？

public void RunProcessAsync(DateTime dumpDate)
{
    BackgroundWorker worker = new BackgroundWorker();
    worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
    worker.DoWork += new DoWorkEventHandler(worker_DoWork);
    worker.RunWorkerAsync(dumpDate);
}

void worker_DoWork(object sender, DoWorkEventArgs e)
{
    // Do Work here
}

void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
    BackgroundWorker worker = sender as BackgroundWorker;
    worker.RunWorkerCompleted -= new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);
    worker.DoWork -= new DoWorkEventHandler(worker_DoWork);
    worker.Dispose();
}

请注意以下代码:

var handler = GetTheRightHandler();
var bw = new BackgroundWorker();
bw.RunWorkerCompleted += OnAsyncOperationCompleted;
bw.DoWork += OnDoWorkLoadChildren;
bw.RunWorkerAsync(handler);

现在假设我想等到bw完成工作.这样做的正确方法是什么？

我的解决方案是:

bool finished = false;
var handler = GetTheRightHandler();
var bw = new BackgroundWorker();
bw.RunWorkerCompleted += (sender, args) =>
{
  OnAsyncOperationCompleted(sender, args);
  finished = true;
});
bw.DoWork += OnDoWorkLoadChildren;
bw.RunWorkerAsync(handler);
int timeout = N;
while (!finished && timeout > 0)
{
  Thread.Sleep(1000);
  --timeout;
}
if (!finished)
{
  throw new TimedoutException("bla bla bla");
}

但我不喜欢它.

我已经考虑用finished同步事件替换标志,在RunWorkerCompleted处理程序中设置它并在以后阻塞它而不是执行while-sleep循环.

唉,这是错误的,因为代码可能在WPF或WindowsForm同步上下文中运行,在这种情况下,我会阻止与 …

我有一个运行单个进程的后台工作程序.我希望能够在它进行时取消处理,但是当我调用CancelAsync()方法时,它实际上从未取消.我哪里错了？

这是DoWork()方法:

        private void bgw_DoWork(object sender, DoWorkEventArgs e)
    {
        BackgroundWorker b = sender as BackgroundWorker;

        if (b != null)
        {
             if (!b.CancellationPending)
            {
                try
                {
                    // Let's run the process as a backgroundworker so we have the ability to cancel the search, and/or be able to view results while it's still searching
                    ProcessParameters pp = e.Argument as ProcessParameters;

                    if (pp.DoReplace)
                        results = FindReplace.FindReplace.FindAndReplace(pp.PathToSearch, pp.FindText, pp.ReplaceText, pp.UseRegularExpressions, pp.IncludeList, pp.ExcludeList, pp.RecurseSubdirectories, pp.IgnoreCase);
                    else
                        results = FindReplace.FindReplace.Find(pp.PathToSearch, pp.FindText, pp.UseRegularExpressions, pp.IncludeList, pp.ExcludeList, pp.RecurseSubdirectories, pp.IgnoreCase); …

我的应用程序使用后台工作程序在循环内做一些工作.我有它,所以在每次循环迭代时,它检查取消挂起是否为真,如果是,则打破循环.好的,我的应用程序一旦完成循环的当前迭代就会停止处理.问题是我认为后台工作程序仍然在运行 - 如果我单击按钮再次开始处理,我会收到一个错误,说后台工作人员正忙.

我打算处理这个工作人员,但是当表单运行时就会创建它,所以如果我处理它,那就不能再开始工作了.我真正想做的是告诉后台工作人员它是完整的,如果我点击"停止处理"按钮,那么当我点击开始按钮时它就可以再次开始处理了!

我打算尝试这个:

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) 
{ 
    while (!backgroundWorker1.CancellationPending) 
    {
        // Start processing in a background thread so the GUI remains responsive,
        // pass in the name of the text file produced by 
        // PFDR FilenameLogic(txtLetterType.Text); 
    } 
}