所以我是WPF的新手，我只是想编写一个简单的小程序。当您按下开始按钮时，它将连续打印伪代码，直到您按下停止按钮为止。我试图重复执行此操作，直到以10种不同的方式按下“停止”按钮，但没有一个起作用。TextBlock元素将更新一次（或永不更新），然后整个程序将无法使用，并且将出现加载光标。我猜想它不是在经历一个周期然后更新TextBlocks，而是在后台执行所有操作，而不是在视觉上进行更新。
public partial class MainWindow : Window
{
System.Windows.Threading.DispatcherTimer dispatcherTimer = new System.Windows.Threading.DispatcherTimer();
Random r1 = new Random();
bool stop = false;
int numUse
public MainWindow()
{
InitializeComponent();
dispatcherTimer.Interval = new TimeSpan(0, 0, 1);
dispatcherTimer.Start();
}
//Executes when the start button is hit, begins timer
private void Button_Click(object sender, RoutedEventArgs e)
{
do
{
dispatcherTimer.Tick += dispatcherTimer_Tick;
} while (stop == false);
}
//Executes when the stop button is hit, ends timers do while loop
private void Button_Click_1(object sender, RoutedEventArgs e)
{
stop = true;
}
private void dispatcherTimer_Tick(object sender, EventArgs e)
{
numUse = r1.Next(1, 2);
if (numUse == 1)
{
CodeBlock1.Text = "struct group_info init_groups = { .usage = ATOMIC_INIT(2) }; ";
CodeBlock2.Text = "";
CodeBlock3.Text = "struct group_info *groups_alloc(int gidsetsize){ ";
CodeBlock4.Text = "struct group_info *group_info; ";
CodeBlock5.Text = "int nblocks; ";
CodeBlock6.Text = "int i; ";
CodeBlock7.Text = "";
CodeBlock8.Text = "initialize stream";
}
else if (numUse == 2)
{
CodeBlock1.Text = "if (gidsetsize <= NGROUPS_SMALL) ";
CodeBlock2.Text = "group_info->blocks[0] = group_info->small_block; ";
CodeBlock3.Text = " else { ";
CodeBlock4.Text = " for (i = 0; i < nblocks; i++) { ";
CodeBlock5.Text = "b = (void *)__get_free_page(GFP_USER); ";
CodeBlock6.Text = " goto out_undo_partial_alloc; ";
CodeBlock7.Text = "} ";
CodeBlock8.Text = "";
} else
{
}
}
}
}
我尝试过使用不同的方法以不同的顺序进行循环。我了解我在走这些路线时可能会搞砸，因此就我而言，任何方法都可以。显然，在这种情况下，我正在使用计时器。
这是没有必要重复调用dispatcherTimer.Tick += dispatcherTimer_Tick中while的循环Button_Click。我怀疑在运行此循环时，消息泵上的其他任何东西都不会运行，包括来自的滴答声DispatcherTimer。
您可以通过从代码中的任何位置调用stop而DispatcherTimer直接取消操作，而仅对它们直接Stop()操作。
也许这是相反的：
public MainWindow()
{
InitializeComponent();
dispatcherTimer.Interval = new TimeSpan(0, 0, 1);
dispatcherTimer.Tick += dispatcherTimer_Tick; // set it up here
}
//Executes when the start button is hit, begins timer
private void Button_Click(object sender, RoutedEventArgs e)
{
dispatcherTimer.Start(); // start timer
}
//Executes when the stop button is hit, ends timers do while loop
private void Button_Click_1(object sender, RoutedEventArgs e)
{
dispatcherTimer.Stop(); // stop timer
}
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我来说两句