Routed Events In WPF

今天在解一個Bugs.... 就發現先前設計的一個Control有一些功能沒有想的很完善.......

於是又重新再思考了一下..... 發現自以為對WPF裡的Routed Event, 包括三種方式Tunnel, Bubble, 與Direct很熟悉

以為已經掌握到訣竅 但是因為之前的設計不完善 怎麼想就是想到一些漏洞

直到看到下面的兩種Add Handler的方法 我才恍然大悟.... 我未曾懂過....

也難怪WPF的Controls的Event機制並沒有照著普通的.Net的event or delegate方法 而是還有什麼AddHandler, ...etc之類的東西

就是為了要Support Routed Event


全文可以再參考一次msdn WPF Event

唔.... 沒有一直持續設計與思考 我還真的沒發現自己沒真正懂過.....

Design的路還很長.......


C# Method1-------------------------------------------------

void MakeButton()
 {
     Button b2 = new Button();
     b2.AddHandler(Button.ClickEvent, new RoutedEventHandler(Onb2Click));
 }
 void Onb2Click(object sender, RoutedEventArgs e)
 {
     //logic to handle the Click event     
 }

The next example shows the C# operator syntax
(Microsoft Visual Basic .NET has slightly different operator syntax
because of its handling of indirection):

C# Method2-------------------------------------------------

void MakeButton2()
{
  Button b2 = new Button();
  b2.Click += new RoutedEventHandler(Onb2Click2);
}
void Onb2Click2(object sender, RoutedEventArgs e)
{
  //logic to handle the Click event     
}

Powered by ScribeFire.