C# BackgroundWorker的使用

<Window x:Class="WpfApp2.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:local="clr-namespace:WpfApp2" mc:Ignorable="d" Title="MainWindow" Height="365.118" Width="753.814"> <Grid> <Grid.RowDefinitions> <RowDefinition></RowDefinition> <RowDefinition></RowDefinition> <RowDefinition></RowDefinition> <RowDefinition></RowDefinition> <RowDefinition></RowDefinition> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="100"></ColumnDefinition> <ColumnDefinition></ColumnDefinition> </Grid.ColumnDefinitions> <TextBlock Text="X" VerticalAlignment="Center" HorizontalAlignment="Center" Margin="3"></TextBlock> <TextBox Margin="3" Grid.Column="1" Name="txtX" VerticalContentAlignment="Center" ></TextBox> <TextBlock Text="Y" VerticalAlignment="Center" HorizontalAlignment="Center" Margin="3" Grid.Row="1"></TextBlock> <TextBox Margin="3" Grid.Row="1" Grid.Column="1" Name="txtY" VerticalContentAlignment="Center"></TextBox> <TextBlock Text="Result" VerticalAlignment="Center" HorizontalAlignment="Center" Margin="3" Grid.Row="2"></TextBlock> <TextBox Margin="3" Grid.Row="2" Grid.Column="1" Name="txtResult" VerticalContentAlignment="Center"></TextBox> <Button Margin="3" Grid.Row="3" Content="Caculate" Name="btnCaculate" Click="btnCaculate_Click_1"></Button> <Button Margin="3" Grid.Row="3" Grid.Column="1" Content="Cancel" Name="btnCancel" Click="btnCancel_Click_1"></Button> <ProgressBar Margin="3" Grid.Row="4" Grid.ColumnSpan="2" Name="progBar"></ProgressBar> </Grid> </Window>

 

using System; using System.Collections.Generic; using System.ComponentModel; using System.Linq; using System.Text; using System.Threading; using System.Threading.Tasks; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; namespace WpfApp2 { /// <summary> /// MainWindow.xaml 的交互逻辑 /// </summary> public partial class MainWindow : Window { private BackgroundWorker worker; public MainWindow() { InitializeComponent(); worker = new BackgroundWorker(); worker.WorkerSupportsCancellation = true; //支持取消             worker.WorkerReportsProgress = true;//支持报告进度             worker.DoWork += worker_DoWork; worker.RunWorkerCompleted += worker_RunWorkerCompleted; worker.ProgressChanged += worker_ProgressChanged; } private void worker_ProgressChanged(object sender, ProgressChangedEventArgs e) { this.progBar.Value = e.ProgressPercentage; } private void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { if (e.Cancelled) //如果取消了，就不可以访问e.result             { this.txtResult.Text = "Cancelled"; } else { this.txtResult.Text = e.Result.ToString(); } this.btnCaculate.IsEnabled = true; this.btnCancel.IsEnabled = false; this.progBar.Value = 100; } private void worker_DoWork(object sender, DoWorkEventArgs e) { var t = e.Argument as Tuple<int, int>;             //Thread.Sleep(5000);             for (int i = 0; i < 10; i++) { Thread.Sleep(500); worker.ReportProgress(i * 10); if (worker.CancellationPending) { e.Cancel = true; return; } } e.Result = t.Item1 + t.Item2; } private void btnCaculate_Click_1(object sender, RoutedEventArgs e) { this.btnCaculate.IsEnabled = false; this.txtResult.Text = string.Empty; this.btnCancel.IsEnabled = true; this.progBar.Value = 0; worker.RunWorkerAsync(Tuple.Create(int.Parse(txtX.Text), int.Parse(txtY.Text))); } private void btnCancel_Click_1(object sender, RoutedEventArgs e) { worker.CancelAsync(); } } }