How to use Sender to from event?

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Hi there,

I have in my Windows Phone application something like that:

C#

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

and

C#

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

Posted 8-Nov-12 12:07pm

jakusza

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3 solutions

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lukeer · Answer 1 · 2012-11-08T20:15:00

Solution 2

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:

C#

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;
}

Posted 8-Nov-12 20:15pm

lukeer

Updated 8-Nov-12 20:32pm

v2

Comments

jakusza 9-Nov-12 8:57am

Great job. But why does it work?

lukeer 12-Nov-12 4:01am

Because sender indeed is a TextBlock. It's passed to the event handler routine as object because of a convention that most of the .NET framework adheres to: "First parameter is object sender, so you'll recognize an event handler on first sight." (kind of)

See also: MSDN on the "as" key word[^]

rachitagarwal2828 · Answer 2 · 2012-11-09T17:52:00

Solution 4

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

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

Posted 9-Nov-12 17:52pm

rachitagarwal2828

Bilaal John S · Answer 3 · 2013-09-19T00:00:00

Solution 5

Please try this code.

C#

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

Thanks,
Bilaal

Posted 19-Sep-13 0:00am

Bilaal John S

How to use Sender to from event?

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How to use Sender to from event?

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