WPF使用笔记-计时器,多线程更新界面,焦点移动等

实习期间开始使用WPF,记录一点东西,没什么技术含量。多线程

// 计时器this

System.Windows.Threading.DispatcherTimer ShowTimer;spa

ShowTimer = new System.Windows.Threading.DispatcherTimer();线程

ShowTimer.Tick += new EventHandler(ShowCurTimer);orm

ShowTimer.Interval = new TimeSpan(0, 0, 0, 1, 0);事件

ShowTimer.Start();element

private void ShowCurTimer(object sender, EventArgs e)string

{it

  // 时分秒 this.TimeText.Text = DateTime.Now.ToString("HH:mm:ss");io

  // 日期 农历 5月1日 星期日

  string MM = DateTime.Now.ToString("MM").TrimStart('0');

   string dd = DateTime.Now.ToString("dd").TrimStart('0');

   this.DateText.Text = "阳历 ";

  this.DateText.Text += MM;

  this.DateText.Text += "月";

   this.DateText.Text += dd;

   this.DateText.Text += "日 ";

   this.DateText.Text += DateTime.Now.ToString("dddd", new System.Globalization.CultureInfo("zh-cn"));

}

 

// 线程

System.Threading.Thread threadRead;

// 互斥锁(看状况使用)

object lockMe = new object();

threadRead = new System.Threading.Thread(threadReadFun);

threadRead.Start();

private void threadReadFun()

{

  while (true)

  {

    System.Threading.Thread.Sleep(TimeSpan.FromSeconds(0.5));

     // 上锁 lock (lockMe) { }

     // 多线程中更新界面

     this.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new delegate1(show));

  }

}

// 上述线程中没法对界面控件进行更新,可定义委托用于在多线程中更新界面

public delegate void delegate1();

private void show()

{

  this.TextBlockName.Text = "new";

}

 

// 后台操做控件,可经过查找Name

((Image)this.FindName("Image1")).Visibility = System.Windows.Visibility.Hidden;

 

// 多窗口关闭

// xaml

Closing="onClosing"

// cs

private void onClosing(object sender, System.ComponentModel.CancelEventArgs e)

{

  Environment.Exit(0);

}

 

// TextBox

GotFocus, LostFocus 得到和失去焦点事件,Tab得到焦点后使用 TextBox.SelectAll()选中全部内容 这对键盘从新输入内容很方便


使用按键控制焦点移动:

private void keyDown(object sender, KeyEventArgs e) {   UIElement element = Keyboard.FocusedElement as UIElement;   if (e.Key == Key.A)   {     if (element != null)     {       element.MoveFocus(new TraversalRequest(FocusNavigationDirection.Previous));       e.Handled = true;     }   }   else if (e.Key == Key.D)   {     if (element != null)     {       element.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));       e.Handled = true;     }   }   else if (e.Key == Key.W)   {     if (element != null)     {       element.MoveFocus(new TraversalRequest(FocusNavigationDirection.Up));       e.Handled = true;     }   }   else if (e.Key == Key.S)   {     if (element != null)     {       element.MoveFocus(new TraversalRequest(FocusNavigationDirection.Down));       e.Handled = true;     }   }   else   {     return;   } }

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