///// <summary>
///// Executes the list of action filters that have their OnActionExecuting executed
///// </summary>
///// <param name="executedActionFilters">The list of executed action filters</param>
///// <param name="postContext">The context of the execution</param>
///// <returns></returns>
//ActionExecutedContext InvokeExecutedFilters(IActionFilter[] executedActionFilters, ActionExecutedContext postContext)
//{
// //Executing the list of all Executed action filters
// foreach (IActionFilter executedActionFilter in executedActionFilters)
// executedActionFilter.OnActionExecuted(postContext);
// return postContext;
//}
/// <summary>
/// Launch the execution of filters and action method
/// </summary>
/// <param name="context">The context</param>
/// <param name="filters">The list of action filters</param>
/// <param name="parameters">The parameters.</param>
/// <returns>
/// The actionExecutedContext build by the execution
/// </returns>
protected virtual ActionExecutedContext InvokeActionMethodWithFilters(BaseController context, IActionFilter[] filters, object[] parameters)
{
//If there is no ActionFilter, the action is simple executed
if (filters == null)
{
var postContext = new ActionExecutedContext(false, null)
{
Controller = context,
ActionParameters = parameters,
ActionMethod = _actionMethod,
Result = InvokeActionMethod(context, parameters)
};
return(postContext);
}
////Now we know that there is, at least one actionFilter
//if (_executedActionFilters == null) _executedActionFilters = new List<IActionFilter>();
//else _executedActionFilters.Clear();
var preContext = new ActionExecutingContext
{
Controller = context,
ActionParameters = parameters,
ActionMethod = _actionMethod
};
//Passing the list throught the lambda expression
Delegates.Func <ActionExecutedContext> continuation = () =>
{
var actContext = new ActionExecutedContext(false, null)
{
Controller = context,
ActionParameters = parameters,
ActionMethod = _actionMethod,
Result = InvokeActionMethod(context, parameters)
};
return(actContext);
};
//Delegates.Func<ActionExecutedContext> reverseFilters = continuation;
//// need to reverse the filter list because the continuations are built up backward
//for (int i = filters.Length - 1; i >= 0; i--)
//{
// var filter = filters[i];
// Delegates.Func<ActionExecutedContext> next = () => InvokeActionMethodFilter(filter, preContext, continuation);
// reverseFilters += next;
//}
Delegates.Func <ActionExecutedContext> reverseFilters = filters.Reverse().Aggregate(continuation,
(next, filter) => () => InvokeActionMethodFilter(filter, preContext, next));
return(reverseFilters());
}
/// <summary>
/// Execute filters and result
/// </summary>
/// <param name="context">The context</param>
/// <param name="filters">The list of filters</param>
/// <param name="actionResult">The result to executed</param>
/// <returns>
/// The resultExecutedContext
/// </returns>
protected virtual ResultExecutedContext InvokeActionResultWithFilters(BaseController context, IResultFilter[] filters, IActionResult actionResult, object[] parameters)
{
//if there is no available result filter the actionResult is simply saved
if (filters == null)
{
InvokeActionResult(context, actionResult);
return(null);
}
Delegates.Func <ResultExecutedContext> continuation = () =>
{
InvokeActionResult(context, actionResult);
return(new ResultExecutedContext(actionResult, false /* canceled */, null /* exception */)
{
Controller = context,
ActionParameters = parameters,
ActionMethod = _actionMethod
});
};
var preContext = new ResultExecutingContext(actionResult)
{
Controller = context,
ActionParameters = parameters,
ActionMethod = _actionMethod
};
//Delegates.Func<ResultExecutedContext> reverseFilters = continuation;
//// need to reverse the filter list because the continuations are built up backward
//for (int i = filters.Length - 1; i >= 0; i--)
//{
// var filter = filters[i];
// Delegates.Func<ResultExecutedContext> next = () => InvokeActionResultFilter(filter, preContext, continuation);
// reverseFilters += next;
//}
// need to reverse the filter list because the continuations are built up backward
Delegates.Func <ResultExecutedContext> reverseFilters = filters.Reverse().Aggregate(continuation,
(next, filter) => () => InvokeActionResultFilter(filter, preContext, next));
return(reverseFilters());
}
/// <summary>
/// Execute the prefilter result, the actionResult and the postfilter result
/// </summary>
/// <param name="filter">The result filter</param>
/// <param name="preContext">The builded preContext</param>
/// <param name="continuation">The lambda expression wich execute the actionResult and the post filter result attribute</param>
/// <returns>The result of the execution of the post filter result attribute</returns>
ResultExecutedContext InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Delegates.Func <ResultExecutedContext> continuation)
{
//Executing the filter
filter.OnResultExecuting(preContext);
//If the execution is cancelled
if (preContext.Cancel)
{
return(new ResultExecutedContext(preContext.Result, true /* canceled */, null /* exception */)
{
Controller = preContext.Controller,
ActionParameters = preContext.ActionParameters,
ActionMethod = _actionMethod
});
}
bool wasError = false;
ResultExecutedContext postContext = null;
try
{
//Creating the ResultExecutedContext by executing the actionResult
postContext = continuation();
}
catch (TargetInvocationException ex)
{
wasError = true;
ProcessExceptionWhenInvokeActionResultFilter(filter, preContext, ex.InnerException ?? ex);
}
catch (Exception ex)
{
wasError = true;
ProcessExceptionWhenInvokeActionResultFilter(filter, preContext, ex);
}
//Everything is executed well
if (!wasError)
{
filter.OnResultExecuted(postContext);
}
return(postContext);
}
/// <summary>
/// Execute the pre filter, the action and the post filter attribute
/// </summary>
/// <param name="filter">The action filter attribute</param>
/// <param name="preContext">The builded executing context</param>
/// <param name="continuation">Lambda expression that create the actionExecutedContext </param>
/// <returns></returns>
ActionExecutedContext InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Delegates.Func <ActionExecutedContext> continuation)
{
//Execute the filter
filter.OnActionExecuting(preContext);
//if the execution process is cancelled by the pre filter
if (preContext.Result != null)
{
return(new ActionExecutedContext(true /*cancelled*/, null /*exception*/)
{
Controller = preContext.Controller,
ActionParameters = preContext.ActionParameters,
ActionMethod = _actionMethod,
Result = preContext.Result
});
}
bool wasError = false;
ActionExecutedContext postContext = null;
try
{
//Executing the action and initializing the postContext
postContext = continuation();
}
catch (TargetInvocationException ex)
{
wasError = true;
ProcessExceptionWhenInvokeActionMethodFilter(filter, preContext, ex.InnerException ?? ex);
}
catch (Exception ex)
{
//An exception is caught
wasError = true;
ProcessExceptionWhenInvokeActionMethodFilter(filter, preContext, ex);
}
//Everything is well done
if (!wasError && postContext.Result != null)
{
filter.OnActionExecuted(postContext);
}
return(postContext);
}
