WPF通过线程使用ProcessBar的方法详解

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我是靠谱客的博主繁荣鞋垫，这篇文章主要介绍WPF通过线程使用ProcessBar的方法详解，现在分享给大家，希望可以做个参考。

前言

WPF下使用进度条也是非常方便的，如果直接采用循环然后给ProcessBar赋值，理论上是没有问题的，不过这样会卡主主UI线程，我们看到的效果等全部都结束循环后才出现最后的值。

所以需要采用线程或者后台方式给进度条赋值的方式，以下通过线程来触发事件触发的方式来实现给进度条赋值。这样就可以模拟我们在实际过程中处理数据的一种进度方式。

方法示例：

复制代码

using System;
using System.Collections.Generic;
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 WpfTestProcessBar
{
 /// <summary>
 /// MainWindow.xaml 的交互逻辑
 /// </summary>
 public partial class MainWindow : Window
 {
  public delegate void ProgressDelegate(int percent);
  public MainWindow()
  {
   InitializeComponent();
   ProgressEvent += MainWindow_ProgressEvent;
   beginImport();
  }
  void MainWindow_ProgressEvent(int percent)
  {
   Dispatcher.Invoke(new Action<System.Windows.DependencyProperty, object>(Pro.SetValue), System.Windows.Threading.DispatcherPriority.Background, new object[] { ProgressBar.ValueProperty, Convert.ToDouble(percent+ 1) });
   Dispatcher.Invoke(new Action<System.Windows.DependencyProperty, object>(label.SetValue), System.Windows.Threading.DispatcherPriority.Background, new object[] { Label.ContentProperty, Convert.ToString((percent + 1)+"%") });

}
  private event ProgressDelegate ProgressEvent;
  private void beginImport()
  {
   Pro.Maximum = 100;
   Pro.Value = 0;
   label.Content = "0%";
   ThreadPool.QueueUserWorkItem(state =>
   {
    Thread.Sleep(2000);
    for (int i = 0; i < 100; i++)
    {
     if (ProgressEvent != null)
     {
      ProgressEvent(i);
     }
     Thread.Sleep(10);
    }
   });
  }
 }
}

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using System;
using System.Collections.Generic;
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 WpfTestProcessBar
{
 /// <summary>
 /// MainWindow.xaml 的交互逻辑
 /// </summary>
 public partial class MainWindow : Window
 {
  public delegate void ProgressDelegate(int percent);
  public MainWindow()
  {
   InitializeComponent();
   ProgressEvent += MainWindow_ProgressEvent;
   beginImport();
  }
  void MainWindow_ProgressEvent(int percent)
  {
   Dispatcher.Invoke(new Action<System.Windows.DependencyProperty, object>(Pro.SetValue), System.Windows.Threading.DispatcherPriority.Background, new object[] { ProgressBar.ValueProperty, Convert.ToDouble(percent+ 1) });
   Dispatcher.Invoke(new Action<System.Windows.DependencyProperty, object>(label.SetValue), System.Windows.Threading.DispatcherPriority.Background, new object[] { Label.ContentProperty, Convert.ToString((percent + 1)+"%") }); 

  }
  private event ProgressDelegate ProgressEvent;
  private void beginImport()
  {
   Pro.Maximum = 100;
   Pro.Value = 0;
   label.Content = "0%";
   ThreadPool.QueueUserWorkItem(state =>
   {
    Thread.Sleep(2000);
    for (int i = 0; i < 100; i++)
    {
     if (ProgressEvent != null)
     {
      ProgressEvent(i);
     }
     Thread.Sleep(10);
    }
   });
  }
 }
}