WPF 精修篇 非UI进程后台更新UI进程

Posted 2021-03-21 lonelyxmas

原文:WPF 精修篇 非UI进程后台更新UI进程

 

 <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="11*"/>
            <RowDefinition Height="29*"/>
        </Grid.RowDefinitions>
        <StackPanel Orientation="Horizontal" Margin="0" VerticalAlignment="Center">
            <Label>开始数据</Label>
            <TextBox x:Name="beginText" HorizontalAlignment="Left" Height="31" TextWrapping="Wrap" Text="100" VerticalAlignment="Top" Width="100"/>
            <Label>结束数据</Label>
            <TextBox x:Name="endText" HorizontalAlignment="Left" Height="31" TextWrapping="Wrap" Text="1000000000" VerticalAlignment="Top" Width="100"/>
            <Button x:Name="button" Content="开始" HorizontalAlignment="Center" VerticalAlignment="Center" Width="75" Click="Button_Click"/>
        </StackPanel>
        <StackPanel Margin="0" Grid.Row="1">
            <TextBlock x:Name="odd" TextWrapping="Wrap"  Text="奇数数量："/>
            <TextBlock x:Name="even" TextWrapping="Wrap" Text="偶数数量："/>
        </StackPanel>
    </Grid>

 

       private int oddcount =0;
        private int evencount =0;
        public void Make(int from ,int to) 
        {
            for (int i = from; i < to; i++)
            {
                if (i % 2 == 0)
                {
                    evencount++;
                }
                else 
                {
                    oddcount++;
                }
            }
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            int from=0;
            int to = 0;
            if(int.TryParse(beginText.Text,out from)&&int.TryParse(endText.Text,out to) )
            {
                button.IsEnabled = false;
                ThreadPool.QueueUserWorkItem(_ =>
                {
                    Make(from, to);
                    Dispatcher.BeginInvoke(new Action(() =>
                    {
                        odd.Text = "奇数数量：" + oddcount;
                        even.Text = "偶数数量：" + evencount;
                        button.IsEnabled = true;
                    }));
                  
                });
        
            }
 
        }

 

   Dispatcher.BeginInvoke(new Action(() =>
                    {
                       //UI线程
                    }));