WPF radiobutton event handling questions

radio.Checked += new RoutedEventHandler(VariantChecked); assuming I have this code. What开发者_StackOverflow if I want to pass an argument to VariantChecked method. What syntax should I apply?

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During creation, attach your data object to the DataContext or the Tag property of the RadioButton.

RadioButton radio=new RadioButton();
radio.DataContext=yourData;

Then in the event handler, get the data back:

void VariantChecked(object sender, RoutedEventArgs e){ 
   RadioButton  radio=(RadioButton)sender; 
   YourData yourData=(YourData)radio.DataContext; 
}

In the above example I have assumed that you have a class or struct named YourData that you want to provide. You can replace this through any primitive like string or int or any other object type.

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The above works also from xaml:

<RadioButton Tag="Static Data, could also be a binding" ...

Here I have taken the Tag property because it makes for such a construction more sense, but DataContext could also be taken. The event handler is the same except for casting from the Tag-property.

void VariantChecked(object sender, RoutedEventArgs e){    
   RadioButton  radio=(RadioButton)sender;    
   string yourStringFromTag=(string)radio.Tag; 
}

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By the way, you can make the code more generic by not specify a concrete control-class but a base class:

void VariantChecked(object sender, RoutedEventArgs e){    
   FrameworkElement fe=(FrameworkElement)sender;    
   string yourStringFromTag=(string)fe.Tag; 
}

Hope this helped...