Web我的項目中有一個BackgroundWorker，我想用一種方法重新啟動。 但是，當我使用CancelAsync()方法，然后立即使用RunWorkerAsync()方法時，取消尚未完成，並且啟動了2個BackgroundWorker實例，並引發了InvalidOperationException。 為了解決這個問題，我使方法異步（它是一個Sub方法），並等待CancelAsync()等待它完成。 WebSome thoughts: 1) You do not need a DataTable to check the existence of a record; Use ExecuteScalar - 2) You can select the type in the first query rather than querying again to get the type, 3) Get a decent profiler (or at worst debug it, manually timing the calls) to make sure you know what the bottleneck is.

c# - How to use WPF Background Worker - Stack Overflow

Web23 mrt. 2024 · I'm separating out logic from one class to another in my Windows Form application. When all in one class, it works fine but I am moving the logic to it's own respective classes now. Having some issues getting at the backgroundWorker from a different class. I have in class A WebSummary. The BackgroundWorker is an excellent tool when you want multi-threading in your application, mainly because it's so easy to use. In this chapter we looked at one of the things made very easy by the BackgroundWorker, which is progress reporting, but support for cancelling the running task is very handy as well. phone number for nys sales tax dept

c# - C＃如何從表單返回結果 - 堆棧內存溢出

Web20 jul. 2024 · To use a BackgroundWorker, you simply tell it what time-consuming worker method to execute in the background, and then you call the RunWorkerAsync method. … Web12 feb. 2024 · For this demo, put a BackgroundWorker, two Labels and two Buttons on your form. The default names (BackgroundWorker1, Label1, Label2, Button1, Button2) … phone number for o\u0027reilly\u0027s