如何从事件中使用Sender？ [英] How to use Sender to from event?

问题描述

你好，



我在我的Windows Phone应用程序中有这样的东西：



< pre lang =c＃> string mhm = 测试;
TextBlock K = new TextBlock（）;
K.Name = ID;
K.FontSize = 22 ;
K.Text = mhm;
K.Tap + = MyClick;

和

  private   void  MyClick（ object  sender，GestureEventArgs e）
 {
  //  如何获取字符串来自发件人的元素mhm（测试）？ 
} 

解决方案

你必须施放 sender 到它的真实类或它实现的使用方法和属性的接口之一。



这是一种方法这样做：

 私人 无效 MyClick （ object  sender，GestureEventArgs e）
 {
 TextBlock txt = sender  as  TextBlock ; 
  if （txt ==  null ）
 {
  throw   new  ArgumentException（  MyClick需要第一个参数为TextBlock）; 
} 
 
  string  whatEver = txt.Text; 
} 

您需要使用原始控件转发发件人

TextBlock txtBlock = sender as TextBlock;



谢谢，

Rachit

http://agarwalrachit.blogspot.in/ [ ^ ]

请尝试此代码。

 私人  void  MyClick（对象发​​件人，GestureEventArgs e）
 {
 TextBlock txtBlk =  new  TextBlock（）; 
 txtBlk（TextBlock）sender; 
  String  txtBlkText = txtBlk.Text; 
 
} 

谢谢，

Bilaal

Hi there,

I have in my Windows Phone application something like that:

string mhm= "Test";
TextBlock K = new TextBlock();
K.Name = "ID";
K.FontSize = 22;
K.Text = mhm;
K.Tap += MyClick;

and

private void MyClick(object sender, GestureEventArgs e)
{
   // How to get string from element mhm ("Test") from sender?
}

解决方案

You have to cast sender to its real class or one of the interfaces it implements to use methods and properties.

Here is one way to do it:

private void MyClick(object sender, GestureEventArgs e)
{
    TextBlock txt = sender as TextBlock;
    if( txt == null )
    {
        throw new ArgumentException("MyClick needs first parameter to be a TextBlock");
    }

    string whatEver = txt.Text;
}

You need to cast the sender with your original control
TextBlock txtBlock = sender as TextBlock;

Thanks,
Rachit
http://agarwalrachit.blogspot.in/[^]

Please try this code.

private void MyClick(object sender, GestureEventArgs e)
{
   TextBlock txtBlk = new TextBlock();
   txtBlk (TextBlock )sender;
   String txtBlkText = txtBlk.Text;
   
}

Thanks,
Bilaal

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