RoutedPropertyChangedEventHandler

RoutedPropertyChangedEventHandlerBelowisasystemdefineddelegate://Representsmethodsthatwillhandlevariousroutedeventsthat//trackpropertyvaluechanges.publicdelegatevo

大家好,欢迎来到IT知识分享网。RoutedPropertyChangedEventHandler

Below is a system defined delegate:

//Represents methods that will handle various routed events that //track property value changes.

public delegate void RoutedPropertyChangedEventHandler<T>(object sender, RoutedPropertyChangedEventArgs<T> e);

 

below is partial definition of RoutedPropertyChangedEventArgs<T>:

public class RoutedPropertyChangedEventArgs<T> : RoutedEventArgs

{

// Summary:

// Initializes a new instance of the System.Windows.RoutedPropertyChangedEventArgs<T>

// class, with provided old and new values.

//

// Parameters:

// oldValue:

// Previous value of the property, prior to the event being raised.

//

// newValue:

// Current value of the property at the time of the event.

public RoutedPropertyChangedEventArgs(T oldValue, T newValue);

}

 

e.g. Slider’s ValueChanged event is of this type:

Slider s = new Slider();

s.ValueChanged += new System.Windows.RoutedPropertyChangedEventHandler<double>(s_ValueChanged);

 

static void s_ValueChanged(object sender, System.Windows.RoutedPropertyChangedEventArgs<double> e)

{

// both e.OldValue and e.NewValue are “double” type.

}

 

 

 

免责声明:本站所有文章内容,图片,视频等均是来源于用户投稿和互联网及文摘转载整编而成,不代表本站观点,不承担相关法律责任。其著作权各归其原作者或其出版社所有。如发现本站有涉嫌抄袭侵权/违法违规的内容,侵犯到您的权益,请在线联系站长,一经查实,本站将立刻删除。 本文来自网络,若有侵权,请联系删除,如若转载,请注明出处:https://yundeesoft.com/33209.html

(0)

相关推荐

发表回复

您的邮箱地址不会被公开。 必填项已用 * 标注

关注微信