Q:

Capture Alert Dialog Button Event

I have added Acr. UserDialogs plugin and called as follows, I could able to see a simple alert with a OK button.  So far so good, but I wonder how to capture OK button click event? 
public void Save()
{
  if (! isExit)
  {
     OnExit(this, null);
  }
  else
  {
     IsValid = false;
     Mvx. Resolve<IUserDialogs>().Alert("it is not valid");
  }
}

A:

Just pass a AlertConfig and set the OnOk action. 
var alertConfig = new AlertConfig {
    Message = "it is not valid",
    OkText = "Okely",
    OnOk = () => { Debug. WriteLine("ok pressed"); }
};

Mvx. Resolve<IUserDialogs>().Alert(alertConfig);

UPDATE for Version 7.0+:
OnOk was renamed to OnAction see: https://github.com/aritchie/userdialogs/blob/master/src/Acr.UserDialogs/AlertConfig.cs#L16
var alertConfig = new AlertConfig {
    Message = "it is not valid",
    OkText = "Okely",
    OnAction = () => { Debug. WriteLine("ok pressed"); }
};

Mvx. Resolve<IUserDialogs>().Alert(alertConfig);

