如何使用 WPF 后台工作者 [英] How to use WPF Background Worker

问题描述

在我的应用程序中，我需要执行一系列初始化步骤，这些步骤需要 7-8 秒才能完成，在此期间我的 UI 变得无响应.为了解决这个问题，我在一个单独的线程中执行初始化:

In my application I need to perform a series of initialization steps, these take 7-8 seconds to complete during which my UI becomes unresponsive. To resolve this I perform the initialization in a separate thread:

public void Initialization()
{
    Thread initThread = new Thread(new ThreadStart(InitializationThread));
    initThread.Start();
}

public void InitializationThread()
{
    outputMessage("Initializing...");
    //DO INITIALIZATION
    outputMessage("Initialization Complete");
}

我已经阅读了几篇关于 BackgroundWorker 的文章，以及它应该如何让我的应用程序保持响应，而不必编写线程来执行冗长的任务，但我没有成功尝试要实现它，谁能告诉我如何使用 BackgroundWorker 来做到这一点?

I have read a few articles about the BackgroundWorker and how it should allow me to keep my application responsive without ever having to write a thread to perform lengthy tasks but I haven't had any success trying to implement it, could anyone tell how I would do this using the BackgroundWorker?

推荐答案

1. 添加使用

using System.ComponentModel;

1. 声明后台工作人员:

private readonly BackgroundWorker worker = new BackgroundWorker();

1. 订阅事件:

worker.DoWork += worker_DoWork;
worker.RunWorkerCompleted += worker_RunWorkerCompleted;

1. 实现两种方法:

private void worker_DoWork(object sender, DoWorkEventArgs e)
{
  // run all background tasks here
}

private void worker_RunWorkerCompleted(object sender, 
                                           RunWorkerCompletedEventArgs e)
{
  //update ui once worker complete his work
}

1. 在需要时运行异步工作线程.

worker.RunWorkerAsync();

1. 跟踪进度(可选，但通常很有用)

1. Track progress (optional, but often useful)

a) 订阅 ProgressChanged 事件并在 DoWork

a) subscribe to ProgressChanged event and use ReportProgress(Int32) in DoWork

b) 设置 worker.WorkerReportsProgress = true;(归功于@zagy)

b) set worker.WorkerReportsProgress = true; (credits to @zagy)

这篇关于如何使用 WPF 后台工作者的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！