Wpf Backgroundworker

显示全部楼层 · 2019-9-17 11:30:38

<Window x:Class="WpfApp53.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:WpfApp53"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<ListBox Grid.Row="0" x:Name="listBox1"/>
<ProgressBar Grid.Row="1" x:Name="progressBar1" Height="20" Margin="5"/>
<StackPanel Grid.Row="2" Orientation="Horizontal" Margin="5">
<TextBlock Text="Status: "/>
<TextBlock x:Name="statusTextBox"/>
</StackPanel>
<Grid Grid.Row="3" Margin="10">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Button Grid.Column="0" x:Name="startBtn" Content="Start" Click="StartBtn_Click"/>
<Button Grid.Column="1" x:Name="cancelBtn" Content="Cancel" Click="CancelBtn_Click"/>
</Grid>
</Grid>
</Window>

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1 using System;
2 using System.Collections.Generic;
3 using System.ComponentModel;
4 using System.Linq;
5 using System.Text;
6 using System.Threading;
7 using System.Threading.Tasks;
8 using System.Windows;
9 using System.Windows.Controls;
10 using System.Windows.Data;
11 using System.Windows.Documents;
12 using System.Windows.Input;
13 using System.Windows.Media;
14 using System.Windows.Media.Imaging;
15 using System.Windows.Navigation;
16 using System.Windows.Shapes;
17
18 namespace WpfApp53
19 {
20 /// <summary>
21 /// Interaction logic for MainWindow.xaml
22 /// </summary>
23 public partial class MainWindow : Window
24 {
25 BackgroundWorker bgWorker;
26 public MainWindow()
27 {
28 InitializeComponent();
29 cancelBtn.IsEnabled = false;
30 }
31
32 private void StartBtn_Click(object sender, RoutedEventArgs e)
33 {
34 listBox1.Items.Clear();
35 startBtn.IsEnabled = false;
36 cancelBtn.IsEnabled = true;
37 bgWorker = new BackgroundWorker();
38 bgWorker.DoWork += BgWorker_DoWork;
39 bgWorker.ProgressChanged += BgWorker_ProgressChanged;
40 bgWorker.RunWorkerCompleted += BgWorker_RunWorkerCompleted;
41 bgWorker.WorkerReportsProgress = true;
42 bgWorker.WorkerSupportsCancellation = true;
43
44 int maxItems = 50;
45 progressBar1.Minimum = 1;
46 progressBar1.Maximum = 100;
47
48 statusTextBox.Text = "Starting...";
49 bgWorker.RunWorkerAsync(maxItems);
50 }
51
52 private void BgWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
53 {
54 if(e.Cancelled)
55 {
56 statusTextBox.Text = "Cancelled";
57 }
58 else
59 {
60 statusTextBox.Text = "Completed";
61 }
62 statusTextBox.IsEnabled = true;
63 cancelBtn.IsEnabled = false;
64 }
65
66 private void BgWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
67 {
68 double percent = (e.ProgressPercentage * 100) / 50;
69 progressBar1.Value = Math.Round(percent, 0);
70 listBox1.Items.Add(new ListBoxItem { Content = e.ProgressPercentage + " item added" });
71 statusTextBox.Text = Math.Round(percent, 0) + "% percent completed";
72 }
73
74 private void BgWorker_DoWork(object sender, DoWorkEventArgs e)
75 {
76 int? maxItems = e.Argument as int?;
77 for(int i=1;i<=maxItems.GetValueOrDefault();i++)
78 {
79 if(bgWorker.CancellationPending)
80 {
81 e.Cancel = true;
82 break;
83 }
84 Thread.Sleep(200);
85 bgWorker.ReportProgress(i);
86 }
87 }
88
89 private void CancelBtn_Click(object sender, RoutedEventArgs e)
90 {
91 bgWorker.CancelAsync();
92 startBtn.IsEnabled = true;
93 }
94 }
95 }

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来源：https://www.cnblogs.com/Fred1987/archive/2019/09/15/11523444.html

Wpf Backgroundworker

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