public override void OnActionExecuting(ActionExecutingContext filterContext)
{
_key = GetViewDataKey(filterContext);
var allKeys = filterContext.Controller.TempData.Keys.ToArray();
//Access all tempdata to figure out which ones can be cleaned out (otherwise they just keep building up, one per action)
foreach (var currKey in allKeys.Where(_ => _ != _key && _.StartsWith(ViewDataKeyPrefix)))
{
//pull it out of temp data
var item = filterContext.Controller.TempData[currKey] as PreventDoubleActionData;
if (item != null && !IsExpired(item))
{
//put it back in, we might need it!
filterContext.Controller.TempData[currKey] = item;
}
else
{
filterContext.Controller.TempData.Remove(currKey);
}
}
_currentActionData = filterContext.Controller.TempData[_key] as PreventDoubleActionData;
if (_currentActionData != null && !IsExpired(_currentActionData))
{
//not expired, reuse it
filterContext.Result = _currentActionData.Result;
//put it back in, we might need it again!
filterContext.Controller.TempData[_key] = _currentActionData;
}
else
{
_currentActionData = new PreventDoubleActionData
{
DateAdded = DateTimeOffset.Now,
PreventionExpiryInSeconds = _preventionExpiryInSeconds,
Result = null
};
filterContext.Controller.TempData[_key] = _currentActionData;
}
}
private static bool IsExpired(PreventDoubleActionData item)
{
return(item == null ||
DateTimeOffset.Now.Subtract(new TimeSpan(0, 0, 0, item.PreventionExpiryInSeconds)) >= item.DateAdded);
}
