c# foreach delegate XAMARIN ANDROID

Asked Jul 21 '18 at 12:37

Active Jul 21 '18 at 12:45

Viewed 20 times

I'm developing an Android App using Xamarin Android. Implementing the UI, I've a loop creating some buttons and it's handlers. My problem is thar whenever the handler is executed, the primitive value passed into the method is the reference of the outter value (i).

private void MyUiMethod(){  
  var i = 0;
  foreach(var item in itemList){
    var data = new MyCustomData();
    var button = new Button();
    button.Click = (s, e) => ButtonClick(s, e, data, i);
    i++;
  }
}

private void ButtClick(object s, EventArgs e, MyCustomData data, int index){
  // HERE ALWAYS THE VALUE OF INDEX IS THE LAST VALUE
  // e.g. If the list has 3 items, index = 3 no matter the button I've clicked; 
}

Any suggestions?

edited Jul 21 '18 at 12:45

asked Jul 21 '18 at 12:37

Rodrigo Fernández

1

where is incrementation for i? I can't see it in your code snippet. – Rafal Malek Jul 21 '18 at 12:43
Sorry, I forgot to add that to the example. – Rodrigo Fernández Jul 21 '18 at 12:46
On the first line of your loop put `var bob = i;` then use `button.Click = (s, e) => ButtonClick(s, e, data, bob);` – mjwills Jul 21 '18 at 12:52
thanks you all, as mjwills pointed it had to be with the scope in which the delegate is executed. – Rodrigo Fernández Jul 21 '18 at 13:02

c# foreach delegate XAMARIN ANDROID

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