public static TEnum GetTrigger <TEnum>(this LambdaExpression selectorExpression)
where TEnum : struct
{
Enum result;
if (!triggersCache.TryGetValue(selectorExpression.@Method(), out result))
{
var triggerAttribute = selectorExpression.@Attribute <TriggerAttribute>(false);
string triggerName = (triggerAttribute != null) ?
triggerAttribute.name : GetTriggerName(selectorExpression.@MethodName());
if (string.IsNullOrEmpty(triggerName))
{
throw new NotSupportedException("Unable to resolve the trigger for the method " + selectorExpression.@MethodName());
}
TEnum typedResult;
if (!Enum.TryParse <TEnum>(triggerName, out typedResult))
{
throw new NotSupportedException("Unable to associate the method " + selectorExpression.@MethodName() + " with a specific trigger.");
}
result = (Enum)(object)typedResult;
triggersCache.Add(selectorExpression.@Method(), result);
}
return((TEnum)(object)result);
}