ThreadPool.QueueUserWorkItem 方法 (WaitCallback)

<Window x:Class="WpfAppThread.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300">
    <Grid>
        <Button Height="23" HorizontalAlignment="Left" Margin="9,23,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click">ButtonOne</Button>
        <Button Height="23" Margin="102,23,101,0" Name="button2" VerticalAlignment="Top" Click="button2_Click">ButtonTwo</Button>
    </Grid>
</Window>

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            ThreadPool.QueueUserWorkItem(new WaitCallback(addtest),"Testaa"); 
            //addtest();
        }

        private void addtest(object aa)
        {
            long result=0;
            for (int i = 0; i < 1000000000; i++)
            {
                result += i;
            }
            MessageBox.Show(result.ToString()+aa.ToString());
            
        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("two");
        }