/// <summary>
/// Determines whether the specified target is valid.
/// </summary>
/// <param name="target"> The target. </param>
/// <param name="scope"> The ValidationScope for the operation. </param>
/// <returns> <c>true</c> if the specified target is valid; otherwise, <c>false</c> . </returns>
public virtual bool Check(TTarget target, ValidationScope scope)
{
// when there is no active ValidationScope, simply perform the check
if (scope == null)
{
if (preconditions != null && preconditions.Any(rule => !rule.Check(target)))
{
// this rule is considered to have succeeded, i.e. not failed, because it has not been evaluated, so return true:
return(true);
}
return(PerformCheck(target, scope));
}
if (CheckPreconditions(scope.Parent ?? scope, target))
{
return(true);
}
// get the result of the rule
var result = PerformCheck(target, scope);
var messageGenerator = MessageGenerator ?? scope.MessageGenerator;
// extract paramaters from the scope and store them if needed in a FailedEvaluation
var parameters = scope.FlushParameters();
if (!result)
{
// record the failure in the ValidationScope
scope.AddEvaluation(new FailedEvaluation(target, this, messageGenerator)
{
IsInternal = CreatesEvaluationsAsInternal,
Parameters = parameters
});
}
else
{
scope.AddEvaluation(new SuccessfulEvaluation(target, this, messageGenerator)
{
IsInternal = CreatesEvaluationsAsInternal,
Parameters = parameters
});
}
return(result);
}
private void RecordResult(ValidationScope scope, bool result, TTarget target)
{
var parameters = scope.FlushParameters();
var messageGenerator = scope.MessageGenerator;
if (result)
{
scope.AddEvaluation(new SuccessfulEvaluation(target, this)
{
MessageGenerator = messageGenerator,
Parameters = parameters
});
}
else
{
scope.AddEvaluation(new FailedEvaluation(target, this)
{
MessageGenerator = messageGenerator,
Parameters = parameters
});
}
}