c# BackgroundWorker元件的作用
阿新 • • 發佈:2020-12-23
當構建一個圖形化的Windows Form桌面應用程式並且需要執行在應用程式主UI執行緒之外的執行緒中長時間的任務時,BackgroundWorker類就很有用了。
要使用BackgroundWorker,我們只需要告訴它希望在後臺執行那個方法並且呼叫RunWorkerAsync()即可
public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender,EventArgs e) { int a = int.Parse(textBox1.Text.Trim()); int b = int.Parse(textBox2.Text.Trim()); Add ad = new Add(a,b); backgroundWorker1.RunWorkerAsync(ad); } private void backgroundWorker1_DoWork(object sender,DoWorkEventArgs e) { Add args=(Add)e.Argument; for (int i = 0; i < 11; i++) { Thread.Sleep(200); backgroundWorker1.ReportProgress(i*10); } e.Result = args.a + args.b; } private void backgroundWorker1_RunWorkerCompleted(object sender,RunWorkerCompletedEventArgs e) { label1.Text = e.Result.ToString(); } private void backgroundWorker1_ProgressChanged(object sender,ProgressChangedEventArgs e) { progressBar1.Value = e.ProgressPercentage; } } public class Add { public int a; public int b; public Add(int a,int b) { this.a = a; this.b = b; } }
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