将方法传递给backgroundworker dowork

在下面的代码中，有没有办法代替总是订阅updateWorker_DoWork方法，传递一个像这样的方法

public void GetUpdates(SomeObject blah) { //... updateWorker.DoWork += new DoWorkEventHandler(blah); //... } public void GetUpdates() { //Set up worker updateWorker.WorkerReportsProgress = true; updateWorker.WorkerSupportsCancellation = true; updateWorker.DoWork += new DoWorkEventHandler(updateWorker_DoWork); updateWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(updateWorker_RunWorkerCompleted); updateWorker.ProgressChanged += new ProgressChangedEventHandler(updateWorker_ProgressChanged); //Run worker _canCancelWorker = true; updateWorker.RunWorkerAsync(); //Initial Progress zero percent event _thes.UpdateProgress(0); } 

Answer 1

对于RunWorkerAsync()您可以传递任何您喜欢的参数。 您可以将Func()或Action()放入其中，并在DoWork()中将对象DoWork()转换回此特定类型并调用它。

这里和这里有例子。

 private void InitializeBackgroundWorker() { _Worker = new BackgroundWorker(); // On a call cast the e.Argument to a Func and call it... // Take the result from it and put it into e.Result _Worker.DoWork += (sender, e) => e.Result = ((Func)e.Argument)(); // Take the e.Result and print it out // (cause we will always call a Func the e.Result must always be a string) _Worker.RunWorkerCompleted += (sender, e) => { Debug.Print((string)e.Result); }; } private void StartTheWorker() { int someValue = 42; //Take a method with a parameter and put it into another func with no parameter //This is called currying or binding StartTheWorker(new Func(() => DoSomething(someValue))); while(_Worker.IsBusy) Thread.Sleep(1); //If your function exactly matches, just put it into the argument. StartTheWorker(AnotherTask); } private void StartTheWorker(Func func) { _Worker.RunWorkerAsync(func); } private string DoSomething(int value) { return value.ToString("x"); } private string AnotherTask() { return "Hello World"; } 

Answer 2

如果我没有误解你，你需要lambda表达式来构造匿名方法。

 updateWorker.DoWork += (sender,e)=> { //bla } 

现在您不必总是编写方法并将其传递给new DoWorkEventHandler(myMethod)

Answer 3

工作了，比我想象的简单。 只需要为DoWork上调用的方法创建一个委托。 可能应该更好地表达我原来的问题。

  public delegate void DoWorkDelegate(object sender,DoWorkEventArgs e); public void GetUpdates() { StartWorker(new DoWorkDelegate(updateWorker_DoWork)); } public void StartWorker(DoWorkDelegate task) { //Set up worker updateWorker.WorkerReportsProgress = true; updateWorker.WorkerSupportsCancellation = true; updateWorker.DoWork += new DoWorkEventHandler(task); updateWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(updateWorker_RunWorkerCompleted); updateWorker.ProgressChanged += new ProgressChangedEventHandler(updateWorker_ProgressChanged); //Run worker _canCancelWorker = true; updateWorker.RunWorkerAsync(); //Initial Progress zero percent event _thes.UpdateProgress(0); } private void updateWorker_DoWork(object sender, DoWorkEventArgs e) { BackgroundWorker worker = sender as BackgroundWorker; e.Result = GetUpdatesTask(worker, e); }