例如:控件属性="{Binding SettingMarkContent,Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}"
OneTime: 绑定也会将数据从源发送到目标;但是,仅当启动了应用程序或 DataContext 发生更改时才会如此操作,因此,它不会侦听源中的更改通知。
OneWayToSource: 绑定会将数据从目标发送到源。
TwoWay: 绑定会将源数据发送到目标,但如果目标属性的值发生变化,则会将它们发回给源。
Default: binding的模式根据实际情况来定,如果是可编辑的就是TwoWay,只读的就是OneWay.
上面的例子不设Mode时,默认的就是Default.
System.Environment.Exit(System.Environment.ExitCode);
this.notifyIcon = new NotifyIcon();
this.notifyIcon.BalloonTipText = "running in background";
this.notifyIcon.ShowBalloonTip(2000);
this.notifyIcon.Text = "running in background";
this.notifyIcon.Icon = new System.Drawing.Icon(DirectoryManager.AppPath + "\\UpDownload_48x48.ico");
this.notifyIcon.Visible = true;
this.Icon = new BitmapImage(new Uri(@"UpDownload_48x48.ico", UriKind.Relative));
//打开菜单项
System.Windows.Forms.MenuItem open = new System.Windows.Forms.MenuItem("Open");
open.Click += new EventHandler(Show);
//退出菜单项
System.Windows.Forms.MenuItem exit = new System.Windows.Forms.MenuItem("Exit");
exit.Click += new EventHandler(Close);
//关联托盘控件
System.Windows.Forms.MenuItem[] childen = new System.Windows.Forms.MenuItem[] { open, exit };
notifyIcon.ContextMenu = new System.Windows.Forms.ContextMenu(childen);
this.notifyIcon.MouseDoubleClick += new System.Windows.Forms.MouseEventHandler((o, e) =>
{
if (e.Button == MouseButtons.Left) this.Show(o, e);
});
private NotifyIcon notifyIcon;
private void Show(object sender, EventArgs e)
{
this.Visibility = System.Windows.Visibility.Visible;
this.ShowInTaskbar = true;
this.Activate();
}
private void Hide(object sender, EventArgs e)
{
this.ShowInTaskbar = false;
this.Visibility = System.Windows.Visibility.Hidden;
}
private void Close(object sender, EventArgs e)
{
System.Environment.Exit(System.Environment.ExitCode);
//System.Windows.Application.Current.Shutdown();
}
private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
{
e.Cancel = true;
Hide();
}
3.判断应用程序是否开启状态
//获取欲启动进程名
string strProcessName = System.Diagnostics.Process.GetCurrentProcess().ProcessName;
////获取版本号
//CommonData.VersionNumber = Application.ProductVersion;
//检查进程是否已经启动,已经启动则显示报错信息退出程序。
if (System.Diagnostics.Process.GetProcessesByName(strProcessName).Length > 1)
{
MessageBox.Show("MetadataSync running in background!", "Message", MessageBoxButton.OK, MessageBoxImage.Exclamation);
Application.Current.Shutdown();
return;
}
4.更新app.config的AppSettings
string key = "ScheduleLastUpload", value = DateTime.Now.ToString();
Configuration conf = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
bool hasSetKey = false;
foreach (string item in conf.AppSettings.Settings.AllKeys)
{
if (item == key)
{
conf.AppSettings.Settings[item].Value = value;
hasSetKey = true;
}
}
if (hasSetKey == false)
{
conf.AppSettings.Settings.Add(key, value);
}
ConfigurationManager.AppSettings.Set(key, value);
conf.Save();
5、给TextBlock加ToolTip,绑定自身
Text="{Binding Path=Patientmain,
Converter={StaticResource fullNameConverter}}"
TextTrimming="CharacterEllipsis">
</TextBlock>
Margin(外边距),指的是元素周围的距离,决定了元素周围留下的空白大小;Padding(内边距),指的是元素边界与其内容之间的距离。做过网页设计、用过CSS的同学对margin和padding属性肯定不陌生,但也有所区别。WPF中的Margin值可以为一个数字、一对数字和四个数字。
一个数字代表四周距离相同,为指定值。一对数字时,第一个数字表示左侧和右侧距离相同,为指定值;第二个数字表示顶部和底部距离相同,为指定值。(与CSS中顺序不同)。四个数字,分别表示左侧、顶部、右侧、底部距离,该顺序与CSS不同。
CSS中margin和padding属性顺序是:两个数字对应左右、上下;四个数字对应上、右、下、左;
区别HTML DOM margin属性
定义和用法
margin属性设置元素的外边距。
该属性可使用1到4个值:
如果规定一个值,比如div{margin:50px}-所有的外边距都是50px
如果规定两个值,比如div{margin:50px10px}-上下外边距是50px,左右外边距是10px。
如果规定三个值,比如div{margin:50px10px20px}-上外边距是50px,而左右外边距是10px,下外边距是20px。
如果规定四个值,比如div{margin:50px10px20px30px}-上外边距是50px,右外边距是10px,下外边距是20px,左外边距是30px。
计算:
继存INotifyPropertyChanged
public class NotificationObject : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
public void RaisePropertyChanged(string proname)
{
if (this.PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs(proname));
}
}
public class TestDemo1CalcuNumber : NotificationObject
{
private int _num1;
public int Num1
{
get { return _num1; }
set
{
_num1 = value;
RaisePropertyChanged("Num1");
}
}
}
然后在VIEWMODEL中可能定义绑定事件,先执行属性中的Set属性RaisePropertyChanged("Num1");,然后执行public void RaisePropertyChanged(string proname),然后执行CalcuNumber_PropertyChanged,最后执行属性中的get属性。
CalcuNumber.PropertyChanged += new System.ComponentModel.PropertyChangedEventHandler(CalcuNumber_PropertyChanged);
void CalcuNumber_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
if (e.PropertyName == "Num1" || e.PropertyName == "Num2")
{
CalcuNumber.Result = CalcuNumber.Num1 + CalcuNumber.Num2;
}
}
弹出屏外层灰色背景半透明背景
<Grid x:Name="GrdGraphicalResults" Grid.RowSpan="3" Visibility="Collapsed">
<Grid.Background>
<SolidColorBrush Color="Black" Opacity="0.6"></SolidColorBrush>
</Grid.Background>
<Border Background="White">
....
</Border>
</Grid>
style使用converter
<Style TargetType="{x:Type DataGridRow}" BasedOn="{StaticResource DataGridRowStyle}">
<Setter Property="Visibility" Value="{Binding IsDeleted,Converter={StaticResource BooleanToVisibilityInverseConverter}}" />
</Style>
RelativeSource绑定
在WPF绑定的时候,指定绑定源时,有一种办法是使用RelativeSource。
这种办法的意思是指当前元素和绑定源的位置关系。
第一种关系: Self
举一个最简单的例子:在一个StackPanel中,有一个TextBlock。
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<TextBlock FontSize= "18" FontWeight= "Bold" Margin= "10" Background= "Red" Width= "80" Height= "{Binding RelativeSource={RelativeSource Self},Path=Width}" >MultiBinding Sample</TextBlock> |
如果想让textbox的width和height相同,通过设置属性Height="{Binding RelativeSource={RelativeSource Self},Path=Width}" 就可以实现。
第二种关系:TemplatedParent
例如为一个Button写一个样式,修改Button为椭圆型。同时需要椭圆的背景色和Button的背景色相同。
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<Style TargetType= "{x:Type Button}" > <Setter Property= "Background" Value= "Green" /> <Setter Property= "Template" > <Setter.Value> <ControlTemplate TargetType= "{x:Type Button}" > <Grid> <Ellipse> <Ellipse.Fill> <SolidColorBrush Color= "{Binding Path=Background.Color,RelativeSource={RelativeSource TemplatedParent}}" /> </Ellipse.Fill> </Ellipse> </Grid> </ControlTemplate> </Setter.Value> </Setter> </Style> |
在这个例子中 TemplateParent就是指的Button
第三种关系:AncestorType
指定绑定源为某个父元素
<Grid> <Label Background = {Binding Path=Background, RelativeSource={RelativeSource AncestorType={x:Type Grid}}}/> </Grid>
这个例子中Label的背景色和Grid的背景色一样。
本事例是打开win8系统触摸键盘。
private void OpenKeyBoardHandler()
{
ProcessStartInfo info = new ProcessStartInfo();
info.FileName = @"C:\Program Files\Common Files\microsoft shared\ink\TabTip.exe";
info.Arguments = "";
info.WindowStyle = ProcessWindowStyle.Hidden;
Process pro = Process.Start(info);
pro.WaitForExit();
this.Close();
}
7.mvvm send key
xaml:
xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
<textbox text="{Binding text,mode=TwoWay,UpdatesourceTrigger=Propertychanged}">
<i:Interaction.Triggers>
<i:EventTrigger EventName="KeyUp">
<ei:CallMethodAction TargetObject="{Binding}" MethodName="SeachKeyUpCommand"/>
</i:EventTrigger>
</i:Interaction.Triggers>
</textbox>
viewmodel:
public void SeachKeyUpCommand(object sender, System.Window.Input.KeyEventArgs e)
{
if(e.Key.Equals(System.Window.Input.Key.Enter))
{
//TODO search
}
}
8.ScrollViewer阻断内部滚动
private void SvrGroupDetail_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
try
{
var eventArg = new MouseWheelEventArgs(e.MouseDevice, e.Timestamp, e.Delta);
eventArg.RoutedEvent = MouseWheelEvent;
eventArg.Source = sender;
ScrollViewer scrollViewer = (ScrollViewer)sender;
scrollViewer.RaiseEvent(eventArg);
}
catch (Exception ex)
{
OneLog.E(ex);
ConfirmDialogState.ShowMessage(ex.Message);
}
}
}
9.监听
C# FileSystemWatcher 在监控文件夹和文件时的用法